Patent Application
20230415581
This application claims the benefit of priority to Korean Patent Application No. 10-2022-0078162, filed on Jun. 27, 2022 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
The present disclosure relates to a vehicle, and more particularly, to a method of controlling braking of a hybrid or electric vehicle.
Recently, a paddle shifter is mounted on a steering wheel of a vehicle. The paddle shifter is used to perform a gear shift operation on a vehicle or change a regenerative braking step.
A vehicle, such as a hybrid or electric vehicle, which has a motor, may charge a battery while generating a braking force by regenerative braking of the motor.
However, in a case that the hybrid or electric vehicle is stopped only by using the regenerative braking, the vehicle may temporarily move without being completely stopped because of unevenness or inclinations in a road.
An aspect of the disclosure is to more securely and stably stop a vehicle by a combination of regenerative braking control, hydraulic braking control, and automatic vehicle hold control.
In accordance with an aspect of the disclosure, a method of controlling vehicle braking includes: decelerating a vehicle to a first speed by using regenerative braking when a vehicle stop request is generated by a manipulation of a paddle shifter; stopping the vehicle by using hydraulic braking when the vehicle is decelerated to the first speed; and maintaining a stopped state of the vehicle by automatic vehicle hold control when the vehicle is stopped.
The method of controlling vehicle braking may include determining that the vehicle stop request is generated when a manipulation of the paddle shifter for braking is continuously performed for a preset time or more.
In the method of controlling vehicle braking, the first speed may be in a range of 0 kph or more and 3 kph or less.
The method of controlling vehicle braking may further include releasing the automatic vehicle hold control when an event, which satisfies a condition for releasing the automatic vehicle hold control, occurs while the stopped state of the vehicle is maintained by the automatic vehicle hold control.
In the method of controlling vehicle braking, the event, which satisfies the condition for releasing the automatic vehicle hold control, may be generated as an accelerator pedal of the vehicle is manipulated.
The method of controlling vehicle braking may include starting the automatic vehicle hold control when the stopped state of the vehicle is maintained for a preset time or more when stopping the vehicle.
In accordance with another aspect of the disclosure, a vehicle includes: a paddle shifter provided on a steering wheel; a motor configured to generate a braking force by regenerative braking; a hydraulic brake configured to generate a braking force by hydraulic braking; and a controller. The controller is configured to decelerate the vehicle to a first speed by using the regenerative braking of the motor when a vehicle stop request is generated by a manipulation of the paddle shifter, to stop the vehicle by using the hydraulic braking of the hydraulic brake when the vehicle is decelerated to the first speed, and to maintain a stopped state of the vehicle by automatic vehicle hold control when the vehicle is stopped.
In the vehicle, the controller may be further configured to determine that the vehicle stop request is generated when the manipulation of the paddle shifter for braking is continuously performed for a preset time or more.
In the vehicle, the first speed may be in a range of 0 kph or more and 3 kph or less.
In the vehicle, the controller may be further configured to release the automatic vehicle hold control when an event, which satisfies a condition for releasing the automatic vehicle hold control, occurs while the stopped state of the vehicle is maintained by the automatic vehicle hold control.
In the vehicle, the event, which satisfies the condition for releasing the automatic vehicle hold control, may be generated as an accelerator pedal of the vehicle is manipulated.
In the vehicle, the controller may be further configured to start the automatic vehicle hold control when the stopped state of the vehicle is maintained for a preset time or more when stopping the vehicle.
In accordance with still another aspect of the disclosure, a method of controlling a vehicle includes: decelerating a vehicle to a first speed by using regenerative braking of a motor when a vehicle stop request is generated by a manipulation of a paddle shifter; stopping the vehicle by using hydraulic braking of a hydraulic brake when the vehicle is decelerated to the first speed; maintaining a stopped state of the vehicle by automatic vehicle hold control when the vehicle is stopped; and releasing the automatic vehicle hold control and accelerating the vehicle when an accelerator pedal is manipulated to accelerate the vehicle while the stopped state of the vehicle is maintained by the automatic vehicle hold control.
The method of controlling a vehicle may include determining that the vehicle stop request is generated when a manipulation of the paddle shifter for braking is continuously performed for a preset time or more.
In the method of controlling a vehicle, the first speed may be in a range of 0 kph or more and 3 kph or less.
The method of controlling a vehicle may include starting the automatic vehicle hold control when the stopped state of the vehicle is maintained for a preset time or more when stopping the vehicle.
These and/or other aspects of the disclosure should become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
Throughout the specification, the same reference numerals denote the same constituent elements. This specification does not describe all elements of the disclosed embodiments. Further, detailed descriptions of what is well known in the art or redundant descriptions on substantially the same configurations have been omitted. The terms ‘part,’ ‘module,’ ‘member,’ ‘block,’ and the like as used in the specification may be implemented in software or hardware. Further, a plurality of ‘part,’ ‘module,’ ‘member,’ ‘block,’ and the like may be embodied as one component. It is also possible that one ‘part,’ ‘module,’ ‘member,’ ‘block,’ and the like includes a plurality of components.
Throughout the present specification, when one constituent element is referred to as being “connected to” another constituent element, one constituent element can be “directly connected to” the other constituent element, and one constituent element can also be “indirectly connected to” the other constituent element. The indirect connection includes a connection through a wireless communication network. In addition, unless explicitly described to the contrary, the words “comprise,” have,” or “include” and variations, such as “comprises,” “comprising,” “has,” “having,” “includes,” or “including,” should be understood to imply the inclusion of stated constituent elements, not the exclusion of any other constituent elements. The terms first, second, and the like are used to distinguish one component from another component, and the component is not limited by such terms described herein. An expression used in the singular encompasses the expression of the plural, unless it has a clearly different meaning when taken in context. When a component, device, element, or the like of the present disclosure is described as having a purpose or performing an operation, function, or the like, the component, device, or element should be considered herein as being “configured to” meet that purpose or to perform that operation or function.
The reference numerals used in operations are used for descriptive convenience and are not intended to describe the order of operations and the operations may be performed in a different order unless otherwise stated.
Hereinafter, embodiments of the disclosure are described in detail with reference to the accompanying drawings.
As illustrated in
The steering wheel 10 enables a user to change a traveling direction of the vehicle 1. The paddle shifters 11 and 12 may each be provided in various forms (e.g., a lever or a switch) and disposed on the steering wheel 10. The paddle shifters 11 and 12 may include a first paddle shifter 11 and a second paddle shifter 12. As illustrated in
The first paddle shifter 11 and the second paddle shifter 12 may be used to adjust gear shift positions or adjust braking force (regenerative braking). In the case of the vehicle 1 including a transmission, the driver may lower a gear stage (−) by pulling the first paddle shifter 11 to change (gear shift) the gear stage of the transmission, and the driver may raise the gear stage (+) by pulling the second paddle shifter 12. The paddle shifters 11 and 12 may be used to adjust a braking force implemented by the regenerative braking of the vehicle 1. The driver increases the braking force by pulling the first paddle shifter 11 and the driver decreases the braking force by pulling the second paddle shifter 12.
As illustrated in
The engine 390 and the motor 312 are power sources that generate power for driving the vehicle 1. The battery 370 is an electric power source for the motor 312 and supplies electric power to the motor 312 through an inverter (not illustrated) in the MCU 360. The battery 370 may supply electric power to the motor 312 through the inverter in the MCU 360 (until the battery is discharged). On the contrary, the battery 370 may be supplied with electric power from the motor 312 and the inverter in the MCU 360 (to charge the battery). The inverter in the MCU 360 converts direct current of the battery 370 into multi-phase alternating current (e.g., three-phase alternating current) and supplies the alternating current to the motor 312 to operate the motor 312.
In
The engine clutch 300 is interposed between the engine 390 and the motor 312. The engine clutch 300 is engaged or disengaged by hydraulic pressure and connects the engine 390 and the motor 312 so that power is transmitted between the engine 390 and the motor 312. Further, the engine clutch 300 disconnects the engine 390 and the motor 312 so that power cannot be transmitted between the engine 390 and the motor 312.
The transmission 322 is connected to an output side of the motor 312. The transmission 322 converts power from the motor 312 or composite power from the engine 390 and the motor 312 and transmits the power to a driving wheel through a driving shaft. An automatic transmission (AT) or a dual-clutch transmission (DCT) may be used as the transmission 322.
In addition, the HCU 320, which is a high-level controller for controlling an overall operation of the vehicle 1, may be mounted in the vehicle 1. The vehicle 1 may have various controllers for controlling various types of devices of the vehicle 1.
For example, the vehicle 1 includes an engine control unit (ECU) 380 configured to control an operation of the engine 390, the MCU 360 configured to control an operation of the motor 312 and the regenerative braking, the TCU 340 configured to control an operation of the transmission 322, and a battery management system (BMS) 350. The BMS 350 is configured to collect battery state information and use the battery state information to charge or discharge the battery 370 or provide the battery state information to another controller. Further, the BMS 350 is configured to manage the battery 370.
The HCU 320, the ECU 380, the MCU 360, the TCU 340, and the BMS 350 communicate with one another through a control area network (CAN) and perform cooperative control on the devices in the vehicle 1. To this end, a high-level controller generates a control instruction by collecting various types of information from low-level controllers and transmits the generated control instruction to the low-level controllers.
In addition, a control process of the present disclosure may be performed as the plurality of controllers such as the HCU 320, the BCU 330, the TCU 340, the BMS 350, and the MCU 360 perform cooperative control. In addition, the control process of the present disclosure may be performed by a single controller in which all the functions of the plurality of controllers are integrated. In the following description, the ‘controller’ may be the HCU 320, i.e., the highest-level controller among the HCU 320, the BCU 330, the TCU 340, the BMS 350, and the MCU 360. Alternatively, the ‘controller’ may be at least one of the HCU 320, the BCU 330, the TCU 340, the BMS 350, and the MCU 360. Alternatively, the ‘controller’ may be a single controller in which all the functions of the HCU 320, the BCU 330, the TCU 340, the BMS 350, and the MCU 360 are integrated.
A hydraulic brake 384 may be connected to the brake pedal disposed in the vehicle 1. The hydraulic brake 384 may generate a braking force in response to a pedal effort applied to the brake pedal, thereby reducing a rotational force of a vehicle wheel. When the pedal effort is applied to the brake pedal, a braking signal having a magnitude corresponding to the pedal effort is inputted to the HCU 320. Hydraulic torque of the hydraulic brake 384 may be adjusted based on the magnitude of the braking signal inputted to the HCU 320.
As illustrated in
When the vehicle 1 travels at a speed of 60 kph, the driver may hold the first paddle shifter 11 to generate the braking force by the regenerative braking (operation 404). The operation of holding the first paddle shifter 11 means that the state in which the driver pushes (or pulls) the first paddle shifter 11 is maintained for a predetermined time. It can be seen that the hold state of the first paddle shifter 11 is maintained for a preset time t1 or more in section ‘II’ in
When the hold time of the first paddle shifter 11 is maintained for the preset time t1 or more (operation 404: YES), the HCU 320 switches the paddle step to stage 4 for a complete stop among a predetermined plurality of stages 1 to 4 of the paddle step (operation 406). In other words, as the driver holds the first paddle shifter 11 for the preset time t1 or more, the paddle step may enter stage 4 of the paddle step in which the vehicle 1 may be decelerated to a first speed by means of the regenerative braking. In an embodiment of the present disclosure, the vehicle 1 is considered as being in a stopped state when a speed of the vehicle 1 reaches a range of the first speed. In an embodiment of the present disclosure, the first speed may be in a range of 0 kph or more and 3 kph or less. It can be seen that the paddle step switches to stage 4 in section ‘II’ in
When the vehicle 1 is decelerated to the first speed by the regenerative braking after the vehicle 1 switches to stage 4 of the paddle step (operation 408: YES), the HCU 320 switches a stop request flag from ‘0’ to ‘1’ (operation 410). In
As described herein, in an embodiment of the present disclosure, only the regenerative braking of the motor 312 is used to brake the vehicle 1 in response to the hold state of the paddle shifter 11 for the preset time. When the vehicle 1 is decelerated to the first speed (e.g., 0 to 3 kph) by the regenerative braking, additional hydraulic braking more stably stops the vehicle 1. In other words, in an embodiment of the present disclosure, it is possible to more securely and completely stop the vehicle 1 by generating the hydraulic braking in addition to the regenerative braking. Generating the hydraulic braking in addition to the regenerative braking is advantageous to prepare for a situation in which the vehicle 1 is finely moved or pushed forward or rearward without being completely stopped only by the regenerative braking of the motor 312 because a road surface at a position at which the vehicle 1 is stopped is not flat or has unevenness or an inclination.
In an embodiment of the present disclosure, the vehicle 1 is considered as being stopped when the vehicle 1 is maintained at the first speed for the preset time (t2 in
In
When a condition for releasing the automatic vehicle hold occurs in the state in which the vehicle 1 is in the automatic vehicle hold state (operation 434: YES), the HCU 320 switches the stop request flag from ‘3’ to ‘0’ and the BCU 330 releases the automatic vehicle hold state in response to the switching of the stop request flag from ‘3’ to ‘0’ (operation 436). For example, the condition for releasing the automatic vehicle hold may mean that the driver manipulates the accelerator pedal 40 (applies the pedal effort). In section ‘VI’ in
On the other hand, the herein-described embodiments may be implemented in the form of a recording medium storing instructions executable by a computer. The instructions may be stored in the form of program code. When the instructions are executed by a processor, a program module is generated by the instructions so that the operations of the disclosed embodiments may be carried out. The recording medium may be implemented as a computer-readable recording medium.
The computer-readable recording medium includes all types of recording media storing data readable by a computer system. Examples of the computer-readable recording medium may include a read-only memory (ROM), a random-access memory (RAM), a magnetic tape, a magnetic disc, a flash memory, an optical data storage device, or the like.
The present disclosure is provided to more securely and stably stop the vehicle by a combination of regenerative braking control, hydraulic braking control, and automatic vehicle hold control in case of stopping the vehicle.
As described herein, the embodiments have been described with reference to the accompanying drawings. A person having ordinary skill in the art may understand that the present disclosure may be carried out in other forms different from those disclosed in the embodiments without changing the technical spirit or the essential features of the present disclosure. The disclosed embodiments are illustrative and should not be interpreted as being restrictive.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0078162 | Jun 2022 | KR | national |
