BACKGROUND
Internal combustion engines having ignition distributors for distributing sparks to multiple cylinders have been used for various purposes, including automobiles, marine applications, airplanes, generators and many other applications, for a number of years. Ignition distributors function to distribute the spark at a specific time to spark plugs to multiple cylinders. The timing of the spark can be important in controlling various types of emissions created by internal combustion engines, as well as affecting engine efficiencies, engine performance and other factors. Prior systems have used mechanical systems that consist of diaphragms contained in sealed compartments that are biased with springs that control spark advancement based upon vacuum or pressure created in various parts of the engine. These types of mechanical systems have a limited lifetime and become less accurate and inoperable over a period of time.
SUMMARY
The present invention may therefore comprise a method of controlling positions of a reluctor plate in a distributor for an internal combustion engine comprising: detecting pressure or vacuum created by the internal combustion engine; generating an electrical sensor signal representative of the pressure or vacuum; generating an electrical control signal using a logic device, the electrical control signal generated in response to the electrical sensor signal and used to control a mechanical actuator; using the mechanical actuator to control the positions of the reluctor plate in the distributor in response to the control signal.
The present invention may further comprise a system for controlling positions of a reluctor plate in a distributor for an internal combustion engine comprising: at least one sensor that detects vacuum or pressure created by the internal combustion engine and generates sensor signals; a memory that stores control data; a logic device, coupled to the memory, that reads the sensor signals and generates a logic signal based upon the sensor signals and the control data stored in the memory; a digital control signal generator that generates a digital control signal in response to the logic signal; a mechanical actuator, that is mechanically coupled to the reluctor plate, that moves the reluctor plate in response to the digital control signal.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic illustration of the implementation of a reluctor plate controller.
FIG. 2 is a schematic diagram of a reluctor plate controller illustrated in the embodiment of FIG. 1.
FIG. 3 is a schematic block diagram of a reluctor plate controller illustrated in FIG. 2.
FIG. 4 is a schematic block diagram of an embodiment of a processor board.
FIG. 5 is an exploded diagram of an embodiment of a reluctor plate controller.
DETAILED DESCRIPTION OF THE EMBODIMENTS
FIG. 1 is a schematic diagram that discloses the manner in which a reluctor plate controller 100 is used in an internal combustion engine. Older internal combustion engines utilize distributors, such as distributor 102, that control the timing of the spark to multiple cylinders. Ignition distributors, such as illustrated in FIG. 1, utilize weights that control the rotation of the distributor based upon the RPMs of the engine which changes the timing of the spark. The distributor has a central shaft that that is geared to the engine drive train so that the central shaft of the distributor rotates at a speed that is linearly proportional to the RPMs of the engine in which the distributor is disposed. As the RPMs of the engine increases, the central shaft of the distributor increases. Weights connected to the central shaft of the distributor create a centripetal force that causes the distributor to rotate which varies the timing of the spark that is distributed to the various cylinders, since the advancement needed for the spark is greater at higher RPMs of the engine.
Separate and distinct from the advancement of the distributor by the centripetal weights is the advancement required when the throttle position is changed. A change in throttle position changes the vacuum/pressure at various locations at the intake of the engine. For example, the vacuum or pressure in the throttle body changes at both the pre-throttle location and the post-throttle location. Further, the vacuum or pressure in various parts of the intake manifold also change. To obtain proper advancement for both efficiency of the engine and to reduce emissions, it has been determined that advancement of the spark in the distributor based upon pressure or vacuum at various locations can positively affect both the efficiency of the engine and reduce pollution emitted by the engine. These changes in vacuum and/or pressure essentially function to accurately predict the RPMs of the engine that will exist after a short-delayed period of a few seconds. In addition, the change in pressure and/or vacuum can be used to provide a fine adjustment to the advancement or retardation of the spark that is distributed to the various cylinders to provide a finer, higher resolution adjustment of the spark advancement or retardation to more accurately control the efficiency, power and pollution effects of the internal combustion engine.
In previous systems, a mechanical diaphragm was used with either one or two vacuum hoses connected to desired locations in the throttle body and/or intake manifold. Depending on the pressure or vacuum that was transmitted to the diaphragm chamber, the diaphragm moved with the assistance of springs to control an arm that then moved a reluctor plate in the distributor. The reluctor plate in the distributor functions to more finely adjust the spark advance or retardation that is not otherwise provided by the centripetal weights in the distributor. Reluctor plates are also referred to as trigger plates or crankshaft timing sensor plates and function, in general, to control the generation of spark pulses using breaker points and a condenser, magnetic pulse generation and optical pulse generation. As used herein, the term “reluctor plate” includes all of the above-described mechanisms. These older mechanical systems that use diaphragms and springs are inaccurate and unable to provide a precise response to the vacuum or pressures used to control the diaphragm. Springs can be selected to vary the response of the mechanical diaphragm devices, but provide very little ability to change the response curves. The ability to control the advancement or retardation by controlling the position of the reluctor plate based upon vacuum and/or pressure readings from various parts of the engine and the ability to program the response, creates a system in which a high degree of precision and accuracy can be achieved to control the efficiency, power and pollution output of the internal combustion engine. That accuracy is achieved using the reluctor plate controller 100 of the present invention.
Referring again to FIG. 1, electrical power is provided by power cable 116 which is connected to fuse 120. Electrical power is then transmitted to the reluctor plate controller 100 to provide power to operate the various electrical components of the reluctor plate controller 100. Similarly, ground cable 118 provides a ground connection to the reluctor plate controller 100. The distributor 102 has a reluctor plate 104 that rotates within the distributor and has a connector 106 that connects to the control shaft 108. Control shaft 108 moves in response to the controls generated by the reluctor plate controller 100. The reluctor plate controller 100 may have a retard vacuum connector 112 and an advance vacuum connector 114. These connectors are connected to vacuum hoses which are also connected at various locations in the throttle body and/or intake manifold. Although both a retard vacuum connector 112 and advance vacuum connector 114 are illustrated, a single vacuum connector or pressure connector may be utilized to achieve similar results. The use of both the retard vacuum connector 112 and an advanced vacuum controller 114 allow connection to a differential pressure vacuum sensor 128 (FIG. 2) to provide a very accurate control pressure and/or vacuum reading. The control shaft 108 is inserted through an opening in the distributor 102 and connects to the connector 106 on the reluctor plate 104. Mounting bracket 110 is designed to mount the reluctor plate controller 100 directly on the distributor 102.
FIG. 2 is a schematic diagram of an embodiment illustrating the manner in which the reluctor plate controller 100 may be implemented with ports on a throttle body 122. As illustrated in FIG. 2, a post throttle suction vacuum tube 124 is connected to the throttle body 122 between the throttle and the intake manifold on the throttle body 122. Pre- or post-throttle vacuum tube 126 can be connected to a port on the opposite side of the throttle on the throttle body 122, as illustrated in FIG. 2, or other location on the other side of the throttle, such as on the intake manifold. The location of the connectors to obtain a desired vacuum and/or pressure is normally determined by the engine manufacturer. The engine manufacturer determines the ideal location for detecting vacuum and/or pressure depending upon the engine configuration. For example, the throttle body 122 in some implementations may be connected to a supercharger or a turbocharger. These devices create high pressures that are applied to the throttle body 122. In such an implementation, it may, or may not be advantageous to determine the pressure at a pre-throttle location.
As also shown in FIG. 2, the post throttle suction vacuum tube 124 and the pre- or post-throttle vacuum tube 126 are connected to the differential pressure vacuum sensors 128. The differential pressure vacuum sensors 128 determine the difference in pressure and/or vacuum between the tubes 124, 126 and generates an analog differential vacuum signal 130. Alternatively, some implementations only require a single vacuum and/or pressure tube. In those cases, the differential pressure vacuum sensors 128 simply generate an analog differential vacuum signal 130 from the single pressure and/or vacuum detected by a single tube. The analog differential vacuum signal 130 is applied to a processor board 134. The processor board is also connected to a home position switch or encoder 132 that generates a signal that is representative of a home position for the control shaft 108. The processor board 134 may include an analog to digital converter 164 (FIG. 4) which creates a digital or binary signal from the analog differential vacuum signal 130 and also for the home position switch or encoder 132, in the instances when the home position switch or encoder 132 generates an analog signal. The processor board 134 also includes a microprocessor, state machine or other logic device and programmable storage such as EPROM or EEPROM or flash memory for storing response curves for a desired response of the system, as disclosed in more detail with respect to FIG. 2. The processor generates control signals which are transmitted to a digital control signal generator 172 (FIG. 4) located on the processor board 134. The digital control signal generator 172 (FIG. 4) generates digital control signals 136 that are then transmitted to a mechanical actuator 138. The mechanical actuator can comprise a linear digital stepper motor, a linear servo motor or a voice-coil actuator to control the movement and positioning of control shaft 108 in a very precise manner. Processor board 134 may have an I/O port 176 (FIG. 4) which allows the processor board 134 to be programmed to provide various different responses to the analog differential vacuum signal 130. As such, various response curves can be stored in EPROM, EEPROM, flash memory or any type of programmable memory on the processor board 134 to create the desired response for advance or retardation of the spark. The programmable advance or retardation can be used for various purposes including changes in engine efficiency, pollution control and output torque of the internal combustion engine. The mechanical actuator 138 generates a very precise output that controls the position of the control shaft 108 with high precision. Control shaft 108, which is connected to the reluctor plate 104, as illustrated in FIG. 1, can then be controlled with a high degree of precision and in a specific manner desired by the user by adjusting response curves that are stored in the memory modules on the processor board 134.
FIG. 3 is a schematic block diagram that describes the operation and function of the reluctor plate controller 100. As illustrated in FIG. 3, throttle body 122 or the intake manifold is connected to one or two vacuum or pressure tubes 124, 126 (herein after referred to as vacuum tubes). The vacuum tubes 124, 126, in turn, are connected to differential pressure or vacuum sensors 128. The differential pressure or vacuum sensors 128 create an analog differential vacuum or pressure signal 130 (herein after referred to as analog differential vacuum signal 130) which is applied to the processor board 134. A home position switch or encoder 132 also provides a home position signal 162 to the processor board 134. The home position switch or encoder 132 can provide a voltage signal Vdd to the processor board 134 at start up, such as upon activation of an ignition switch, that sets the processor and the mechanical control shaft 108 at an initial position. Alternatively, an encoded signal can be transmitted to the processor board 134 upon activation of the ignition switch. A power signal 116 from battery 140 is also applied to the processor board 134 to operate the electrical devices on the processor board 134. The processor board 134 and the battery 140 are connected to ground connectors 118. A processor board 134 may include an analog to digital converter that converts the analog signals, such as the analog differential vacuum signal 130, into a digital or binary signal. Processor board 134 may also include a microprocessor, state machine, or other logic device, for controlling the operations preformed on the processor board 134. Storage devices are also included on the processor board 134, such as programmable storage 168 (FIG. 4), including EPROMs or EEPROMs, flash memory or similar devices. A digital control signal generator 172 (FIG. 4) that generates the digital control signal 136 is mounted on the processor board 134. The digital control signals generated by the digital control signal generator 172 (FIG. 4) are applied to a mechanical actuator 138 such as a digital stepper motor, a servo motor or a voice-coil actuator. This is all disclosed in more detail with respect to FIG. 4. The logic device 166 (FIG. 4) on the processor board 134 retrieves stored response curves that are applied to the digital control signal generator 172 (FIG. 4) on the processor board 134, which in turn generates the digital control signal 136, in accordance with the stored response curves in the storage modules on the processor board 134. The mechanical actuator 138 precisely controls a control shaft 108 that is connected to the distributor reluctor plate 104. Precise control of the distributor reluctor plate 104 is achieved by precise movement of the control shaft 108. Highly precise movement is created by mechanical actuator 138, which may comprise a digital stepper motor, a servo motor, a voice-coil actuator 138 or similar device that is controlled with a high degree of precision. In this manner, the distributor reluctor plate 104 can be controlled very accurately and in a manner that corresponds to a stored actuation response on the processor board 134. A programmer computer 175 is also connected to the processor board 134 via connection 174.
FIG. 4 is a more detailed diagram of the processor board 134. As illustrated in FIG. 4, an analog differential vacuum signal 130 is applied to an analog to digital converter 134 on the processor board 134. Analog to digital converter 164 generates a binary signal that is applied to the logic device 166. Logic device 166 may comprise a microprocessor, a state machine or other similar logic device for performing logic functions. A home position signal 162 may also be applied to the analog to digital converter 164 which converts the home position signal 162 into a binary signal. Alternatively, the home position signal 162 may comprise a binary signal that is then applied directly to the logic device 166 via connector 163. An input/output port (1/O port) 176 may be provided on the processor board 134 which allows connection to a programmer's computer 175 via the connection 174. A logic device 166 may be connected to various storage devices, such as programmable storage 168, RAM 170 or ROM memory (not shown). Programmable storage 168 may comprise EPROM, EEPROM, flash memory or other storage memory that can be programed with response curves for the desired output or positioning of the control shaft 108 (FIG. 3). The logic device 166 creates a logic signal 178 that is applied to the digital control signal generator 172. The digital control signal generator 172 is essentially a driver that converts the logic signals into digital control signals 136 which control the mechanical actuator 138 (FIG. 3). The connection of the devices illustrated in FIG. 4 is of schematic nature only. As understood by those skilled in the art, the devices may be connected via a bus which provides an inter-connection between the devices illustrated in FIG. 4. These techniques are well known by those skilled in the art.
FIG. 5 is an exploded diagram of the reluctor plate controller 100. As illustrated in FIG. 5, the reluctor plate controller 100 includes a metal plated housing 144. The metal plated housing 144 is durable and is grounded which functions to protect the electronics housed within the metal plated housing 144 from electromagnetic interference and electrical pulse signals that may affect the reluctor plate controller 100. The metal plated housing 144 is sealed to the backing plate 152 with gasket 148 to seal out moisture, dust and other contaminants that may affect the mechanical and electrical devices that are housed in a metal plated housing 144. Mounting screws 146 protrude through the metal plated housing 144 and engage the backing plate 152 with threaded holes in the backing plate 152. Inside the metal plated housing 144 is the home position switch or encoder cover 134 and the home position switch or encoder 132. Also enclosed in the housing is the mechanical actuator 138 which may comprise a linear digital stepper motor, a servo motor, a voice-coil actuator, or similar device, that is mounted on motor chassis 150. Processor board 134 is also mounted on the motor chassis 150. Motor chassis 150 is mounted on the backing plate 152. Differential pressure and/or vacuum sensors 128 are also mounted on the backing plate 152. A vacuum hose nipple 154 is press fit into the backing plate 152 and provides at least one connection for a vacuum or pressure hose. Another vacuum or pressure port is also placed on the metal plated housing 144. Mounting bracket 156 is mounted on an opposite side of the backing plate 152. An opening in the mounting bracket 156 and another opening in the backing plate 152 provides a connection between the mechanical actuator 138 that controls the control shaft 108. Control shaft 108 is connected to the shaft of the mechanical actuator 138 with a control shaft clevice 158. Control shaft 108 is inserted in a slot in the shaft clevice 158. A pivot pin 160 is inserted through the control shaft clevice 158 and through an opening in the control shaft 108 to secure the control shaft 108 to the control shaft clevice 158.
Consequently, a highly accurate and high resolution reluctor plate controller 100 is capable of controlling the advance or retardation of sparks that are distributed to spark plugs in multiple cylinders in an internal combustion engine with a high degree of precision not achieved by previous mechanical systems. In addition, the response curves that control the position of control shaft can be programed into the system to achieve various desired results for advancing and retarding the spark of the internal combustion engine which can create greater efficiency of the engine, lower emissions and/or greater power.
The foregoing description of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and other modifications and variations may be possible in light of the above teachings. The embodiment was chosen and described in order to best explain the principles of the invention and its practical application to thereby enable others skilled in the art to best utilize the invention in various embodiments and various modifications as are suited to the particular use contemplated. It is intended that the appended claims be construed to include other alternative embodiments of the invention except insofar as limited by the prior art.
Patent Grant
11493014
