A smooth braking control method and system

Abstract

The application provides a smooth brake control method and system. Through optimization of brake and clutch motor control flow, the control end only needs to send brake motor control depth instruction, without worrying about the situation that the vehicle is unexpectedly shaken or even turned off due to the vehicle speed being lower than the current gear idle speed during the brake process. Meanwhile, when the vehicle speed is not less than the current gear idle speed, the operation of "controlling the clutch motor to brake to pos=m position" is executed, so that when the vehicle speed is less than the idle speed, the clutch motor can move to the position of pos=n with the smallest stroke, thereby ensuring the smoothness of the control.

Description

Technical Field

[0001] This invention relates to the field of automobile driving, and more specifically to braking control methods and systems. Background Technology

[0002] In manual transmission vehicles, during automatic deceleration or braking, the vehicle deceleration is controlled by adjusting the depth of the brake pedal. When the speed decreases to the idle speed corresponding to the current gear, the clutch pedal needs to be depressed; otherwise, the vehicle will shake, and in severe cases, the vehicle may stall.

[0003] The existing solution controls the clutch and brake simultaneously. The detailed control process involves simultaneously depressing the brake pedal and immediately depressing the clutch pedal completely. This control method does not specify the timing of the clutch pedal's action or the specific travel distance.

[0004] If the current vehicle speed is significantly higher than the idle speed of the corresponding gear, when braking is applied, the vehicle may not have fully decelerated to the idle speed of the current gear at the moment the brake and clutch pedals are fully depressed. At this point, the transmission is disengaged, and in the event of a brake system malfunction, the risk of rolling away in neutral is substantial. Furthermore, under normal circumstances, the transmission disengages when the clutch pedal reaches the semi-engaged position or below. The travel of the clutch pedal from this position to its fully depressed position is meaningless to the control system and simply wastes system energy. In summary, this patent provides the optimal timing and travel position for clutch pedal control, avoiding the risk of rolling away and energy waste caused by rough control. Summary of the Invention

[0005] The problem this patent aims to solve is that, during braking in a manual transmission car, there is no need to consider the relationship between the current vehicle speed and the gear; simply controlling the depth of the brake pedal is sufficient to control the vehicle's deceleration, making the control simpler and smoother.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] A smooth braking control method, comprising the following steps:

[0008] S1: Receives braking command;

[0009] S2: Determine the vehicle speed and control the clutch pedal position based on the determination result;

[0010] First result: If the vehicle speed is not greater than the current gear idle speed, before performing the braking action, first control the clutch pedal to the semi-engaged position, and then control the brake motor to the designated position;

[0011] Second result: If the vehicle speed is greater than the current gear idle speed, control the clutch pedal to the semi-engaged position, and then control the brake motor to the specified position;

[0012] S3: If the judgment result is the second result, then determine whether the vehicle is decelerating. If the vehicle is decelerating, then execute step S2 until the first result is obtained.

[0013] A smooth braking control system includes: a signal acquisition system, a control system, a brake drive mechanism, and a clutch drive mechanism;

[0014] The signal acquisition system acquires vehicle parameters and transmits them to the control system. The control system sends commands to the brake drive motor, the brake drive mechanism is connected to the brake pedal, and the control system sends commands to the clutch drive mechanism, the clutch drive mechanism is connected to the clutch pedal.

[0015] Furthermore, the vehicle signal acquisition system includes a vehicle speed sensing unit, an engine speed sensing unit, a vehicle gear sensing unit, and a vehicle deceleration sensing unit.

[0016] Furthermore, the control system is capable of executing the smooth braking control method.

[0017] This invention optimizes the control flow of the brake and clutch motors, enabling the control unit to send only a brake motor control depth command, eliminating concerns about unexpected vehicle vibrations or even stalling during braking due to vehicle speed falling below the current gear's idle speed. Simultaneously, when the vehicle speed is not lower than the current gear's idle speed, the "control the clutch motor to brake down to: pos=m" operation ensures that when the vehicle speed is lower than the idle speed, the clutch motor can move to the pos=n position with minimal travel, thus guaranteeing smooth control. Attached Figure Description

[0018] Figure 1 Structural diagram of a specific embodiment of the present invention;

[0019] Figure 2 Clutch pedal position diagram of a specific embodiment of the present invention;

[0020] Figure 3 Flowchart of a specific embodiment of the present invention;

[0021] In the diagram: 100 – Vehicle signal acquisition system; 101 – Control system;

[0022] 102 - Brake actuator motor; 103 - Clutch actuator motor

[0023] 104 – Automotive OBD or vehicle bus;

[0024] 200 - Clutch pedal reset state; 201 - Half-clutch end position;

[0025] 202 - Half-clutch start position; 203 - Clutch pedal fully depressed position; Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] like Figure 1 and Figure 3 As shown, the smooth braking control system provided by the present invention includes a vehicle signal acquisition system 100 and a control system 101. The vehicle signal acquisition device 100 is connected to the car's OBD or vehicle bus and collects vehicle information in real time. The collected information includes, but is not limited to, vehicle gear, vehicle speed, engine speed, and vehicle deceleration.

[0029] When the brake pedal is pressed, the control system 101 analyzes the vehicle information collected by the vehicle signal acquisition system 100 to determine whether the current vehicle speed is less than the idle speed of the current gear. If the current vehicle speed is less than the idle speed of the engine in the current gear, the control system 101 sends a command to the clutch actuator motor 103. The clutch actuator motor 103 drives the clutch pedal to move to pos=n, that is, the semi-engaged start position 202, through a mechanical mechanism, and then performs the braking action.

[0030] If the current vehicle speed is not less than the idle speed of the current gear, the control system 101 sends a command to the clutch actuator motor 103, which drives the clutch pedal to move to pos=m, i.e., the semi-engaged end position 201, and then controls the brake actuator motor 102 to move to the designated position.

[0031] At this point, it is determined whether the vehicle speed is decelerating. If the vehicle is not decelerating, the braking command is terminated. If the vehicle is decelerating, it is determined whether the current vehicle speed is lower than the current gear idle speed. The above process is repeated until the vehicle speed is lower than the current gear idle speed. The control system 101 controls the clutch pedal to move to pos=n, which is the semi-engaged start position 202.

[0032] The above method ensures that when the vehicle speed is less than the idle speed, the clutch motor can move to the pos=n position with the minimum stroke, thus ensuring smooth control.

[0033] like Figure 2 As shown, the clutch pedal has several states and their functions are as follows:

[0034] State 1: Default reset state (pos = 0). The clutch pedal is in this state when no external force is applied. At this time, the clutch has no impact on the vehicle.

[0035] State 2: Free travel state (pos > 0 and pos < m). The clutch pedal is in this state when a certain external force is applied. At this time, the clutch has no impact on the vehicle.

[0036] State 3: Fully depressed state (pos = 100). The clutch pedal is fully depressed under the action of a certain external force. In this state, any gear can be engaged, but it has no impact on vehicle drive.

[0037] State 4: Free travel state after gear engagement (pos > n and pos < 100). The clutch pedal is fully depressed under the action of a certain external force. In this state, any gear can be engaged, but it has no impact on vehicle drive.

[0038] State 5: Semi - linkage state (pos >= m and pos <= n). After engaging the starting gear, when the clutch is in this range, the engine power is output to the vehicle driving wheels. As the pedal position increases, the output power becomes stronger.

[0039] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered within the protection scope of the present invention.

Claims

1. A smooth braking control method, characterized by, The method employs a smooth braking control system, which includes: a signal acquisition system, a control system, a brake drive mechanism, and a clutch drive mechanism. The signal acquisition system acquires vehicle parameters and transmits them to the control system. The control system sends commands to the brake drive motor. The brake drive mechanism is connected to the brake pedal. The control system sends commands to the clutch drive mechanism. The clutch drive mechanism is connected to the clutch pedal. The method steps include: S1: Receives braking command; S2: Determine the vehicle speed and control the clutch pedal position based on the determination result; First result: If the vehicle speed is not greater than the current gear idle speed, before performing the braking action, first control the clutch pedal to the semi-engaged position, and then control the brake motor to the designated position; Second result: If the vehicle speed is greater than the current gear idle speed, control the clutch pedal to the semi-engaged position, and then control the brake motor to the specified position; S3: If the judgment result is the second result, then determine whether the vehicle is decelerating. If the vehicle is decelerating, then execute step S2 until the first result is obtained.

2. The method of claim 1, wherein: The signal acquisition system includes a vehicle speed sensing unit, an engine speed sensing unit, a vehicle gear sensing unit, and a vehicle deceleration sensing unit.

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