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U.S. Pat. No. 9,815,325-B2 discloses a universal braking system with adjustable wheel traction that utilizes a plurality of spikes embedded in a vehicle's wheel rim. The spikes are extended and retracted using a motor/linear actuator motors that is concentric located on a disc with a disc gear mounted on the other edge of the disc for each spike. The rotation of the disc by the motor/linear actuator motors causes each disc gear to mesh with each spike gear to cause each spike to move outward and proportionally to the turn of the disc. The extension of each spike causes it to penetrate through a hole in a tire and meet a road surface or support surface. This configuration also requires an inner tube to be inserted in a tire since the design has not defined a way to make the hole in the tire airtight. Each spike is heated using an electric heating element with a nonfreezing fluid which circulates in a channel that house each spike. The nonfreezing fluid is heated via an electric heating element. The entire system is controlled and monitored by a UBS computer control system.
This invention relates to a universal brake system (UBS) that combines features from a prior art anti-lock brake system (ABS) with adjustable wheel traction system (AWT) and with improved technology called smart wheel. This UBS features provides a vehicle operator with the ability to control skidding and reduce a vehicle stopping distance on dry road surfaces and particularly on slippery rigid road surfaces e.g. wet roads, ice covered roads, or snow-covered roads and non-rigid surfaces such as sand and loose gravel. It is important to note that today's conventional ABS's are most effective on dry rigid road surfaces e.g. concrete or asphalt and less effective on slippery wet, icy or snow covered rigid road surfaces and non-rigid surfaces such as sand and loose gravel. This is due to the obvious lack of tire traction on these types of surfaces which can make controlling a vehicle's skidding almost impossible with just an ABS. Hence, the invention of the UBS solves the problem with the lack of wheel traction (friction) and skid control on dry, wet, frozen and slippery roads consisting of rigid surfaces and non-rigid surfaces by utilizing an adjustable wheel traction system that can extend and retract wheel spikes on demand as a result of a vehicle operator pressing a vehicle's brake pedal, and using the brake system controller to alternate between locking a wheel on a spike long enough time for it to penetrate one of said mentioned types of road surfaces and then measuring the wheel slip of the rear wheel and switching back to anti-lock and anti-skid mode momentarily. This cycle is repeated until the slip that cause the wheel to lockup goes away.
The wheel traction system consists of a plurality of spikes embedded in a wheel's housing and controlled by a brake system microprocessor controller which can automatically upon pressing a vehicle's brake pedal extend spikes 14 outward beyond a wheel's supporting surface to create friction (traction) with a wheel's supporting surface. The spikes are automatically retracted when a vehicle's operator release the brake pedal if the unit is operating in the automatic mode.
The wheel traction system has several modes of operation that determines how much the plurality of spikes extends outward beyond a wheel surface. The modes of operation are based on the types of road surfaces and road conditions a vehicle will be driven on. A summary of the different modes of operation: A) Dry mode—no spikes are extended, and the braking system works as an anti-locking braking system with continuous wheel slip control. B) Wet Mode—A plurality of spikes are extended a predetermined distance upon a vehicle operator pressing a vehicle brake pedal. In this mode, the braking system microprocessor controller allows a wheel to momentary lockup on a spike long enough time for it to dig-into a supporting surface to create traction (friction) between a wheel and its supporting surface. C) Ice Mode—works the same as wet mode except the predetermined distance that spikes are extended is a little more than in the wet mode. D) Snow Mode—works the same as the ice mode except the predetermined distance spikes are extended is a little more than the ice mode.
The wheel traction system has two configurations: a) The wheel traction system is integrated into a vehicle's wheel assembly. This configuration is best suited for new vehicles or vehicles that are having their wheels replaced to take advantage of the safety features of the wheel traction system. b) The second configuration is an independent adapter to be mounted outside of an existing vehicle's wheel. This configuration is designed mainly to adapt to an existing vehicle wheel. Power for the wheel traction system is via a fly wheel generator mounted inside a wheel assembly or adapter assembly, a battery pack and solar panel with charge controller. Communication to the wheel retraction system is via a wireless remote terminal unit (RTU) 33 microprocessor controller mounted internally to the wheel assembly or adapter assembly and communicates wirelessly with a vehicle's wireless brake RTU 50 controller and/or engine control unit (ECU). An alternate method of communication is via hardwired connections between RTU's and ECU.
Traction is obtained from a plurality of spikes configured on a circle disc with each spike having its own gear 16 that mesh with a gear on the gear disc 23. Each spike has a solenoid 25 control latch 26 that allows the spike to be release and extend under the power of a stepper motor 21 and latch in place when extended. Each spike has means to absorb shock via spring 14A. Solenoid 25 pulls the latch 26 away to allow the spike to retract under the power of spring 17 when a brake pedal is released. Individual wheel rotational velocities are controlled by selective operation of dump and apply valves that control the wheel brake pressure applied at each of the wheels. The operation of the valves provides three modes of operation, namely, dump to reduce the applied pressure, apply to increase the applied pressure, and hold to maintain the applied pressure at the current level.
Brief Description of Improvements consisting of adding Smart Wheel Features in
The universal braking system comprises: An adjustable wheel traction system configured as either a standalone wheel adapter or integrated into a vehicle's wheel assembly comprising:
An adapter housing 24
Configured as a standalone wheel adapter
Traction Modes
* For all slippery modes, the terrain adapter 27 and 27A are selected to match road conditions to create the maximum amount of friction between a wheel and its supporting surface.
In manual spike mode said spikes stay extended a fix predetermined distance based on road conditions. In this mode said spikes 14 will stay extended until the unit is switch to automated mode or any other position, in automatic spike mode spikes will extend and retract proportionate to the brake pedal 67
The operation of the UBS in slippery mode is demonstrated in
Dry Surface Mode—which includes an adjustable modulator (not shown), for increasing a hydraulic pressure to oil cylinders of the left and right, and front and rear wheels of the vehicle in a hydraulic pressure increase mode, holding as is the current value of the hydraulic brake pressure in a hydraulic pressure holding mode, and for reducing the hydraulic brake pressure to the oil cylinder of said left and right, and said front and rear wheels of said vehicle in a hydraulic pressure reduction mode; a detection means for detecting the speed of said left and right, and said front and rear wheels of said vehicle; a slip detection means for judging by evaluating signal outputs from said detection means whether or not a slip of the extent to which anti-skid control is necessary has been generated in any of the front, rear, left and right wheels of said vehicle and a controller which controls the modulator based on the judged result of said slip detection means, and which selects and sets one of said hydraulic pressure increase mode, said hydraulic pressure holding mode and said hydraulic pressure reduction mode for each wheel. The controller provides an anti-skid control setting means for setting an anti-skid control for the wheel; the slip detection means judged that the anti-skid control is necessary; a hydraulic pressure control means for setting said adjustable modulator at either the pressure maintaining mode or the pressure reduction mode with regard to the wheel for which the anti-skid control has been set by said anti-skid control setting means until the slipping which triggered the anti-skid control disappears, and, when the slipping disappears, for setting the adjustable modulator at the pressure increase mode in condition that the wheel speed of the wheel is increasing; and a pressure increase restriction means for determining whether slip is increasing at the pair of front or rear wheels to which the wheel the pressure increase mode is set does not belong, and converting the pressure increase mode to either the pressure maintaining mode or the pressure decrease mode if the slip at the pair of front or rear wheels is increasing.
Referring to the drawings, illustrated in
The master cylinder first reservoir is connected to an UBS control valve 70 by a first hydraulic line 75 the second reservoir is connected to the control valve 70 by a second hydraulic line 76. The UBS control valve 70 includes a plurality of normally open and normally closed solenoid valves (not shown) and a separate source of pressurized hydraulic fluid, such as a motor driven pump (not shown). The pump is typically included in the body of the control valve 70 while the pump is mounted upon the exterior thereof. The control valve 70 is connected by first pair lines 72 and 71 to right and left front wheels 78 and 77, respectively. For the vehicle in
Typically, the control valve 70 includes a normally open solenoid valve (not shown) between each of the brake circuits and the corresponding master cylinder reservoir. Upon actuation, the valve closes are to isolate the brake circuit from the master cylinder 69. Accordingly, the valve is typically referred to as an isolation valve. For optimal control of the speed of each of the vehicle wheels, each of the wheel brakes can be provided an associated isolation valve. The control valve also typically includes a first normally closed valve (not shown) for each wheel brake that connects the wheel brake cylinder with a brake fluid reservoir (not shown). Upon actuation, the first normally closed valve is opened to bleed hydraulic fluid from the wheel brake cylinder and thereby reduce the pressure applied to the wheel brake. Accordingly, the first normally closed valve is usually referred to as a dump valve. The control valve also usually includes a second normally closed valve (not shown) for each wheel brake that connects the wheel brake cylinder with an outlet of the pump. Upon actuation, the first normally closed valve is opened to supply pressurized hydraulic fluid from the pump to the wheel brake cylinder and thereby raise the pressure applied to the wheel brake. Accordingly, the second normally closed valve is usually referred to as an apply valve. The reservoir connected to the dump valves is connect to the pump inlet and thereby supplies hydraulic brake fluid to the motor driven pump.
The speed of the front wheels 78 and 77 are monitored by a first pair of wheel associated wheel speed sensors 78a and 77a, respectively. Similarly, the speed of wheels 80 and 79 of associated wheel speed sensors 80a and 79a, respectively. The wheel speed sensors 77a, 78a, 79a and 80a are electrically connected to an UBS electronic control unit (54). Closing the brake switch 67a provides a signal to the ECU 54 that the vehicle brakes have activated. The ECU 54 also is electrically connected to the pump motor and the actuation coils of the solenoid valves included with the control valve 70. The ECU 54 includes a microprocessor with a memory that stores an UBS control algorithm
During vehicle operation in the dry mode/anti-lock mode, the microprocessor in the ECU 54 continuously receives speed signals from the wheel speed sensors 77a, 78a, 79a and 80a and from the spike position detectors (43 & 44) for each wheel via wireless remote terminal unit 45. The operation of the UBS operating in the dry mode/anti-lock brake with anti-skid is illustrated by the waveforms shown in
When the difference between the actual wheel speed 93 in
After the wheel speed attains the vehicle speed, it is desirable for the ECU microprocessor to apply a series of pulses at t5 to the apply valve associated with the wheel cylinder to raise the pressure. The operation of the apply valve is illustrated in
Because the speed of each wheel is monitored separately, by utilizing a different algorithm for the microprocessor in the ECU 54, the system illustrated also may function as a Traction Control System (TCS) and/or a Vehicle Stability Control (VCS) system for dry, wet, ice and snow conditions and for slippery rigid surfaces and non-rigid surfaces when integrated with the wheel traction system.
“Smart Wheel” Improvements
The smart wheel features are described in
1). Each spike 120 has individual motor/linear actuators 210 with a lower spike gear 200 attached to the shaft of a linear actuator motor 210. When the linear actuator retracts it meshes the lower spike gear 200 with a spike gear 180 which causes a spike 120 to extend outward. The spike is retracted by the power of a spring 190 after being released by the locking ratchet levers 135. This gear assembly 90 is mounted in an airtight environmentally sealed enclosure 220 compartment in the bottom of the barrel part of a wheel's rim 230 between the outboard face and inboard rim edge. This configuration will allow each spike to be powered separately by its own motor/linear actuator motors 210 that is mounted radially along the barrel part of a rim 230. Furthermore, individually powered spikes 120 allow multiple rows of spikes
2) A tubeless tire 240 with a pularity of flexible tube channels 100 that is threaded at both ends and mechanically connected from the upper surface of a tire down to a wheel's rim barrel surface to form an air tight environmentally seal inside of a tire. Each flexible channel 100 allows each spike 120 to move freely inside of the flexible channel while allowing a tire 240 to remain inflated and keep its flexibility. Each spike 120 is mechanically connected to a roller switch 120b that extends and retracts with a spike. Each roller switch will touch a wheel supporting surface to close a switch which provide a starting signal to a wheel's remote terminal unit. Each tire has channels in its threads to allow a roller switch to move back and forth such that it can contact a wheel supporting surface when a spike is extended. A tire has magnets embedded in its tire tread surface. A magnet for start signal in front of a spike and a magnet co-located next to each spike. A tire is pressure fitted over a rim and weight balanced.
3) Each spike 120 has a spring 160 inserted in the head of the spike 120 on a shaft such that it allows the spike to freely move against the spring 160 to form a shock absorber. There is also a limit switch 160a located inside of shock absorber spring 160 which closes when a spike 120 compresses the spring when it meets a wheel's supporting surface.
4) Each spike 120b has a roller switch symmetrically and mechanically connected to each spike that moves when a spike moves. The roller switch provides a start signal to a remote terminal unit that that signals the universal brake system to start slowing down a wheel enough to be able to lock a wheel when a stop signal is generate when the shock absorber limit switch closes when a spike come in contact with a wheel's supporting surface.
5) Each spike 120 is heated individually by an electric heating element 125 embedded in each spike 120.
6) A means for multiple spikes 120 to be assembled in adjacent rows on a wheel's rim 230 and controlled by a single motor/solenoid 210.
7) A means to supply power from a fly wheel generator 32 mounted in a hub cap 38a on a wheel. Electrical power is inducted from a primary coil on a fly wheel generator to a secondary coil (via magnetic induction) that provides AC power to a power supply 290 that produce DC power for wireless remote-control units 33 and wheel electrical loads. There is a second power supply that receives AC power from the primary coil to produce DC power electronic loads inside of hub cap.
8) To assembly a smart wheel with spikes 120 requires the lower gear box assembly 90 to be installed in the enclosure area 220 of the barrel of a rim 230 first. After a tire 240 is installed on a rim, the upper spike 150 is screwed into the lower portion of the spike assembly 90 via a hole 240a in the tire 240. Next a flexible channel 100 which is threaded on both ends is screwed through a threaded hole 240a in the upper part of a tire until it drops down over a spike 120 and then threaded into hole 90a located in the rim 230 barrel. Next after applying thread bonding sealant to all threads and utilizing a notched hand tool 100a to simultaneously screw the flexible channel 100 into both the upper tire thread 240a and rim threaded 90a to form an air tight mechanical seal at both ends. The roller switches are installed by screwing their connecting rods into the side of each spike and then screwing the roller switch into the connecting rod. These steps are repeated for all remaining spike 120 positions. Afterwards a tire can be inflated via an air valve, sealed to rim and wheel balanced.
9) A manual mode is added to allow the spikes to remain extended at a depth determined by a vehicle operator.
10) Automatic mode is added to allow the adjustable traction system to automatically engage at any time skid conditions or wheel slip is detected by the wireless remote unit controller 33 located inside an environmentally sealed enclosure in the wheel.
11) Wet mode, ice mode, and snow mode is included that allow the spike to extend a predetermine distance based on road conditions.
12) Collision avoidance mode allows a smart wheel to work with the 360 degrees of sonar radar coverage to allow spike to extend if there is heavy braking and if a vehicle get within unsafe stopping distance to an object.
13) Parking assistance mode provide a vehicle operator with parking guidance using the 360 degree of sonar radar surveillance.
14) Security mode utilizes 360-degree radar zone coverage and a smart phone to provide a vehicle with radar zone coverage and emergency contact calling if a vehicle wheel speed is detected by a remote terminal unit. There are also optional alarms that connect to a vehicle's horn and lights.
15) The “Smart Wheel” with adjustable wheel traction can also be integrated into a vehicle's universal brake system to allow for locking a wheel on a spike using several methods.
15a. The first method consists of installing magnetic sensors 255, along with a sonar distance measuring radar 275 in the top of a vehicle's wheel well. There is also a start magnet installed in a tire in front of a spike and a stop magnetic 250 installed 240 next to the same spike to generator a start and stop signal when a spike 120 passes by a magnetic sensor 255. A magnetic sensor 255 is located on the left and redundant one on the right side of a wheel well at right angles to a vertical line through the center of a wheel. A third backup magnetic sensor 255 is co-located a long with a sonar radar 275 at the top of a wheel's well on a center line through a wheel. A remote terminal unit (rtu) measures the angular velocity of a wheel by measuring the time between a set of start and stop signals and dividing the angle (theta) between start and stop signals by the measured time. The distance measuring sonar radar 275 sensors is used to measure the distance from the radar device 275 to the top of wheel surface to determine how much a vehicle body has moved from its level position. This normal level distance is stored as a reference distance in a wheel's remote-control unit (rtu) memory and is compared to future measurements to determine when a vehicle is not level. When a vehicle is level the left and right magnetic detectors 255 will lined up with a stop magnet for a spike which puts one spike at right angles directly under a wheel's supporting surface. Therefore, a vehicle's braking system can be signaled with a start signal to start slowing a wheel to prepare for a wheel lock when the corresponding stop signal is generated. Furthermore, it is important to note that the distance between the start and stop detector is set for a predetermine wheel angular velocity response time that is at least equal or greater than the braking system mechanical system response time for wheel locking conditions. This configuration will insure that a vehicle's braking system has enough time to stop a wheel precisely on a spike after receiving a start signal from the master rtu followed by a stop signal.
15b. However, if a vehicle body is not level, then that means the magnetic detectors have moved an arc distance a long a wheel from the level position. Therefore, to compensate for this movement the radar measuring device at the top of each wheel measures the distance from the top of a wheel to the radar device and an rtu compares that newly measured distance to the reference level distance.
If the distances are not equal, then the vehicle body is not level. Therefore, the difference between the reference distance and newly measure distance is equal to the offset distance which is estimated to be equal approximately to an arc length a long a wheel that a magnetic detector 255 has been displaced. Hence, this offset arc length is divided by the angle velocity of a wheel to arrive at a compensating time and assuming the vehicle's body moved down, then the time between start and stop signals at a predetermine angular velocity will be reduced by the compensating time by a vehicle's braking system in-order to stop a wheel on the next available spike. The opposite is true if the body of a vehicle body has moved up in a wheel well.
15c. A third method for locking a wheel on a spike consist of using the top of the wheel magnetic detector. This method simply requires a start signal to be sent via an rtu to the universal brake system to alert it to slow a wheel down to a predetermined speed for lock wheel conditions followed by a stop signal which signals to a rtu to provide a lock wheel signal to the universal brake system. Therefore, since the spikes are located every 90 degrees then there is spike 180 degrees from the spike at the top of a wheel and under the supporting surface of a wheel.
15d. A fourth method for locking a wheel on a spike consist of situations where a wheel may be traveling too slow to generate a magnetic start and/or stop signal. Therefore, a series of mechanical roller switches 120b have been installed that mechanically connects a pair of roller switches directly to each spike via an arm such that when a spike extends or retracts it extend and retracts the roller switch ahead of each roller each spike. The roller switch comes in contact with a wheel's support surface before a spike does to generate a start signal that is sent directly to each wheel's rtu, then to the master rtu which signal the universal brake system to begin to slow a wheel down so that a wheel can be stopped and locked instantly when the limit switch 160a in each spike's shock absorber is closed when a spike comes in contact with a wheel's supporting surface. This scenario assumes that a wheel is traveling at slow enough speeds to be stopped instantly under wheel lock conditions based on the mode of operation of the universal brake system.
16. Furthermore, a master rtu prioritizes each of the above spike tracking methods base on the following sequence: It reads for a valid signal from the top magnetic detectors first, then checks the left magnetic detector, then the right magnetic detector for valid signals, and lastly the rtu checks for a valid signal from a roller switch 120b and the shock absorber limit switch 160a.
17. When the “Smart Wheel” operates as a standalone adjustable traction system it not integrated to a vehicle's universal brake system and therefore does not offer the wheel locked features. In addition, the limit switches 120b and roller switches 160a are not utilized in the standalone mode. Furthermore, the standalone mode utilizes its own wireless remote computer controller 33 embedded in each wheel to measures wheel speed using the magnetic sensors 255 and one wheel serves as a master controller that utilize wireless communications to collect wheels speed data and sonar data from the other wheels in real-time and compares their speeds to the other wheels speeds to make the following minimum decisions:
a) Lost of traction—If the main power wheel is rotating faster or slower than the other three wheels. Then the spike controller for each smart wheel issues a signal to cause each motor/solenoid to extend based on selected road conditions (dry, wet, ice or snow) for as long as slip conditions are measured and then for an additional predetermined amount of time before retracting the spikes.
b) Vehicle is skidding—This will show up in wheel speed measurement as wheel slip or difference in wheel speeds and therefore the spikes will be extended accordingly to gain traction based on selected mode of operation (dry, wet, ice or snow). Skidding may also take place as result of wheels being locked up due to heavy braking which will also cause spikes to be extended accordingly until heavy braking has stopped.
The “Smart Wheel” will also contain the following optional features using a “Smart Phone” software application:
Filing Document | Filing Date | Country | Kind |
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PCT/US2018/020988 | 4/10/2018 | WO | 00 |