Integrated electronic braking system, control method and vehicle

Abstract

The invention discloses an integrated electronic braking system which comprises a central controller and motor driving circuits, the motor driving circuits are electrically connected with wheel edge motors, and at least two motor driving circuits are arranged in the central controller. According to the integrated electronic braking system, the motor driving circuit is integrated to the central controller, the problem that the working environment is severe when the brushless motor driving circuit is arranged on the wheel end brake can be solved, the performance and reliability of the whole EMB system can be improved, and the running safety of a vehicle can be effectively ensured. The invention further discloses a control method of the integrated electronic brake system and a vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of brake systems, and in particular, the present invention relates to an integrated electronic brake system, a control method and a vehicle Background Art

[0002] The EMB (Electro-Mechanical Brake) braking system is an electronic mechanical wire-controlled braking system. As a high-end version of the wire-controlled braking system, it abandons the hydraulic braking circuit and uses a brushless motor-driven mechanical structure to directly control the wheel-end braking force. This system architecture design requires at least four wheel-end EMB controllers (WCU: Wheel Control Unit) to be arranged on each vehicle, that is, four sets of brushless motor drive circuits. At the same time, in order to respond to the braking force requirements of the whole vehicle and the vehicle dynamic control algorithm, such as ABS (Anti-Lock Braking System, anti-lock braking system), ESC (Electronic Stability Control, electronic stability control system) and other functions, it is necessary to set up an EMB system central control unit (CCU: Centre Control Unit) on the whole vehicle to monitor the dynamic operation of the vehicle and control the stability of the vehicle operation when the vehicle brakes.

[0003] The entire EMB system requires four wheel-end controller circuit units and two central controller circuit units. The wheel-end working environment is harsh and the temperature and vibration resistance requirements of electronic components are high, which will lead to the inability to effectively ensure vehicle driving safety.

[0004] It is desirable to provide an improved electronic brake system, particularly with regard to how to solve the problem of a brushless motor drive circuit being arranged on a wheel-end brake in a harsh working environment, thereby improving the reliability of the EMB brake system. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an integrated electronic brake system, the purpose of which is to improve reliability.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an integrated electronic braking system, including a central controller and a motor drive circuit, the motor drive circuit is electrically connected to the wheel-side motor, and at least two motor drive circuits are arranged in the central controller.

[0007] A switching circuit is provided in the central controller, and the switching circuit is electrically connected to the motor driving circuit.

[0008] A calculation unit is provided in the central controller, and the calculation unit is electrically connected to the switching circuit. The motor drive circuit is configured to be controlled by a certain calculation unit through the switching circuit.

[0009] The calculation unit is provided with at least two paths.

[0010] A sensor circuit is arranged in the central controller, the calculation unit is electrically connected to the sensor circuit, and the calculation unit controls the motor drive circuit according to a sensor signal transmitted by the sensor circuit.

[0011] The sensor circuit is provided with at least two paths.

[0012] A power supply system is provided in the central controller, and at least one power supply system is configured to supply power to the computing unit and the motor drive circuit.

[0013] At least two electronic parking drive circuits are arranged in the central controller.

[0014] The present invention also provides a control method for an integrated electronic brake system, comprising:

[0015] The central controller identifies the type of vehicle service brake fault;

[0016] The central controller monitors the brake sensor signal and controls the brake to apply braking force when the set conditions are met;

[0017] The central controller determines the wheel speed status signal of the vehicle, compares the wheel speed status signal with the braking intention signal to preset a value in advance, and the calculation unit sends a signal to the motor drive circuit to control the brake to slow down the vehicle with a certain braking force.

[0018] The present invention also provides a vehicle, comprising the integrated electronic braking system.

[0019] The integrated electronic brake system of the present invention can solve the problem of harsh working environment of the brushless motor drive circuit arranged on the wheel-end brake by integrating the motor drive circuit into the central controller, thereby improving the performance and reliability of the entire EMB system and effectively ensuring the driving safety of the vehicle; in addition, after integration, a large number of control MCU chips can be saved, control efficiency and accuracy can be improved, the unsprung weight of the entire vehicle can be reduced simultaneously, and costs can be greatly saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] This specification includes the following drawings, which show the following contents:

[0021] Figure 1 It is a structural schematic diagram of the integrated electronic braking system of the present invention;

[0022] Figure 2 is a circuit control diagram of the integrated electronic brake system of the present invention;

[0023] The following are marked in the figure: 1. power management circuit; 2. first computing unit; 3. switching control module; 4. second computing unit; 5. power management circuit; 6. motor drive circuit; 7. first communication circuit; 8. brake sensor circuit; 9. motor position sensor circuit and wheel speed sensor circuit; 10. second communication circuit; 12. power supply; 13. wheel-side motor. DETAILED DESCRIPTION

[0024] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0025] First, as Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an integrated electronic braking system, including a central controller and a motor drive circuit, the motor drive circuit is electrically connected to the wheel side motor, and at least two motor drive circuits are arranged in the central controller.

[0026] Specifically, in the embodiment of the present invention, by integrating the motor drive circuit into the central controller, the problem of the poor working environment of the motor drive circuit arranged on the wheel-end brake can be solved. By optimizing the circuit design, reducing the line impedance loss of the long-distance drive circuit high-current loop, and performing redundant switching of the drive circuit, the performance and reliability of the entire EMB system are improved. This can effectively ensure the driving safety of the vehicle. When any single point of the service brake fails, the integrated electronic brake system of the embodiment of the present invention achieves safe braking and parking brake by switching and controlling the backup circuit.

[0027] In the embodiment of the present invention, the central controller refers to the central control ECU (Electronic Control Unit), which may include all the control circuits of the present invention, and may also integrate other functional modules, communication modules and other computing brains in the whole vehicle, and may also be a domain controller.

[0028] like Figure 1 As shown, at least two motor drive circuits are provided in the central controller, and each motor drive circuit controls the wheel side motors that drive the brakes provided on different wheels. A switching circuit is provided in the central controller, and the switching circuit is electrically connected to all the motor drive circuits.

[0029] like Figure 1As shown, a computing unit is provided in the central controller, the computing unit is electrically connected to the switching circuit, and the motor drive circuit is configured to be controlled by a computing unit through the switching circuit. The computing unit is provided with at least two paths, and the switching circuit is electrically connected to all computing units. The computing unit can be a microprocessor chip or a dedicated preset program chip. A switching circuit is provided between the computing unit and the motor drive circuit, and the switching circuit is adjusted according to the design scheme of the motor drive circuit. The purpose of the switching circuit is to realize that when a single point failure occurs in the computing unit or a motor drive circuit closely related to the computing unit, it can be switched to another computing unit and a motor drive circuit in a normal state for continued control to ensure the normal operation of the braking system.

[0030] In the embodiment of the present invention, the wheel-side motor is a motor arranged at the wheel end of the vehicle. The motor arranged at the wheel end is not limited to one motor at a certain wheel, and a parking motor may also be arranged. The wheel-side motor is used to provide a driving force for the piston of the driving brake to move, and is a driving motor that applies a braking force.

[0031] like Figure 1 As shown, a sensor circuit is provided in the central controller, and the calculation unit is electrically connected to the sensor circuit, and the calculation unit controls the motor drive circuit according to the sensor signal transmitted by the sensor circuit. The sensor circuit is provided with at least two paths.

[0032] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the sensor circuit includes a brake sensor circuit, a motor position sensor circuit and a wheel speed sensor circuit, and at least two brake sensor circuits are provided. The brake sensor circuit is electrically connected to the brake pedal position sensor (Pedal Travel Sensor, PTS), and the position of the brake pedal is determined by the brake pedal position sensor and a brake intention signal indicating the degree of depression of the brake pedal is generated. The central controller receives the driver's brake intention signal through at least two brake intention sensor circuits. The wheel speed sensor circuit is electrically connected to the wheel speed sensor (WheelSpeed ​​Sensor, WSS), and the wheel speed sensor is used to measure the rotation speed of the wheel of the vehicle during driving. The wheel speed sensor circuit is connected to the central controller to provide the vehicle's motion state in real time. The motor position sensor circuit is electrically connected to the motor position sensor (Rotor Position Sensor, RPS), and the motor position sensor is used to measure the precise position of the rotor of the wheel-side motor.

[0033] like Figure 1As shown, in an embodiment of the present invention, two computing units (the first computing unit 2 and the second computing unit 4 in the figure) provided in the central controller redundantly control the motor drive circuit through a switching circuit, and the motor drive circuit is switched and controlled after the received sensor signal is determined by the computing unit.

[0034] The switching circuit is configured as at least one group of control switches, and control signals of the control switches are distributed according to the calculation unit, and the control signals control the motor drive module through the switching circuit.

[0035] The motor drive circuit and the switching circuit in the central controller are connected, the motor drive circuit is connected to the wheel side motor through the connector, and the wheel side motor can be controlled by a certain computing unit by switching the switch switching circuit configuration.

[0036] The motor position sensor circuit and wheel speed sensor circuit in the central controller are connected to the calculation unit. The motor position sensor circuit provides feedback values ​​for precise control of the motor. The wheel speed sensor circuit can provide the vehicle status from the signal obtained from the wheel speed sensor. In addition, combined with the signal transmitted to the calculation unit by the brake sensor circuit, both calculation units can control the motor drive circuit according to the brake sensor circuit and the wheel speed sensor circuit.

[0037] like Figure 1 and Figure 2 As shown, a mutually redundant power supply system (Power Management IC, PMIC) is provided in the central controller, and the power supply system is also controlled by the computing unit. At least one power supply system is configured to supply power to one computing unit and a motor drive circuit. The power supply systems do not interfere with each other, and the computing units respectively perform switch control on whether to supply power.

[0038] In the embodiment of the present invention, at least two electronic parking drive circuits are provided in the central controller. The wheel speed sensor circuit of the vehicle is also integrated into the central controller together with the corresponding motor drive circuit. Even if a single point failure occurs in a single wheel side connection circuit, or a single point failure occurs in any hardware of the central controller, there is still a calculation unit that controls the motor drive circuit through the switching circuit, which can ensure that the braking force of at least three wheels is maintained, thereby improving the safety and stability of the vehicle.

[0039] In a second aspect, the present invention further provides a control method for an integrated electronic brake system, comprising the following steps:

[0040] The central controller identifies the type of vehicle service brake fault;

[0041] The central controller monitors the brake sensor signal and controls the brake to apply braking force when the set conditions are met;

[0042] The central controller determines the vehicle's wheel speed status signal, compares the wheel speed status signal with the braking intention signal to preset a value in advance, and the calculation unit sends a signal to the motor drive circuit to control the brake to slow down the vehicle with a certain braking force.

[0043] In the embodiment of the present invention, the service brake fault types include invalid service brake and weakened service brake. The central controller identifies invalid or weakened service brake of the vehicle, calculates the vehicle posture and the driver's intention through the integrated calculation unit, and controls the motor drive circuit to control the safe braking of the vehicle.

[0044] In an embodiment of the present invention, the central controller monitors the continuous changes in the braking intention signal transmitted by the brake sensor circuit, and obtains a calculation result after calculation. Once the calculation result exceeds the set value, the set condition is met, and then the braking force is immediately applied to the wheel through the control brake of the switching circuit.

[0045] In the embodiment of the present invention, the central controller determines the wheel speed state signal of the vehicle and performs correlation calculation on the wheel speed sensor signal and the brake sensor signal. Then the calculation result is compared with the set threshold value. If the calculation result exceeds the threshold value, the calculation unit will send a signal to control the motor drive circuit, the wheel side motor will work, and the brake will generate a certain braking force to slow down the vehicle; if the calculation result is lower than the threshold value, the wheel side motor will not work.

[0046] Through the above operations, no matter what single point failure occurs in the vehicle's electronic braking system, the electronic braking system can decelerate the vehicle to a standstill and lock the vehicle with a certain parking force.

[0047] In an embodiment of the present invention, during the vehicle deceleration and braking process, the central controller integrates the control circuit of the wheel motor to control the brake or release the brake. The central controller can continue to monitor the brake pedal travel signal and ensure the maximum braking force of at least three wheels.

[0048] The integrated electronic brake system and control method of the above structure have the following advantages:

[0049] 1. Obtain braking safety: The backup motor drive circuit and the switching circuit can utilize the four-way independent wheel motor braking control. If any wheel fails, the safe braking force can be maintained to enable the vehicle to brake safely.

[0050] 2. Move the main electronic components of the wheel-end controller of the EMB system from the wheel end to the central controller, and perform backup switching of the circuits in the control center, thus reducing the number of electronic components used in the entire system.

[0051] In a third aspect, the present invention further provides a vehicle, comprising the integrated electronic brake system of the above structure. The specific structure of the integrated electronic brake system can be referred to Figure 1 to Figure 2 Since the vehicle of the present invention includes the integrated electronic brake system in the above embodiment, it has all the advantages of the above integrated electronic brake system.

[0052] The complete vehicle and vehicles of the present invention include but are not limited to passenger cars and commercial vehicles.

[0053] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An integrated electronic brake system, comprising a central controller and a motor drive circuit, wherein the motor drive circuit is electrically connected to a wheel motor, and is characterized in that: At least two motor drive circuits are arranged in the central controller.

2. The integrated electronic brake system according to claim 1, characterized in that: A switching circuit is provided in the central controller, and the switching circuit is electrically connected to the motor driving circuit.

3. The integrated electronic brake system according to claim 2, characterized in that: A calculation unit is provided in the central controller, and the calculation unit is electrically connected to the switching circuit. The motor drive circuit is configured to be controlled by a certain calculation unit through the switching circuit.

4. The integrated electronic brake system according to claim 3, characterized in that: The calculation unit is provided with at least two paths.

5. The integrated electronic brake system according to claim 4, characterized in that: A sensor circuit is arranged in the central controller, the calculation unit is electrically connected to the sensor circuit, and the calculation unit controls the motor drive circuit according to a sensor signal transmitted by the sensor circuit.

6. The integrated electronic brake system according to claim 5, characterized in that: The sensor circuit is provided with at least two paths.

7. The integrated electronic brake system according to any one of claims 3 to 6, characterized in that: A power supply system is provided in the central controller, and at least one power supply system is configured to supply power to the computing unit and the motor drive circuit.

8. The integrated electronic brake system according to any one of claims 3 to 6, characterized in that: At least two electronic parking drive circuits are arranged in the central controller.

9. The control method of the integrated electronic brake system according to any one of claims 1 to 8, characterized in that: include: The central controller identifies the type of vehicle service brake fault; The central controller monitors the brake sensor signal and controls the brake to apply braking force when the set conditions are met; The central controller determines the wheel speed status signal of the vehicle, compares the wheel speed status signal with the braking intention signal to preset a value in advance, and the calculation unit sends a signal to the motor drive circuit to control the brake to slow down the vehicle with a certain braking force.

10. A vehicle, characterized in that: An integrated electronic braking system comprising any one of claims 1 to 8.

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