A safety redundant brake control device and control method for automobile testing

Abstract

The present invention provides a safety redundant brake control device for automobile testing, and introduces its control method. The device includes a first mounting plate, a tension spring, a pin, a screw, a second mounting plate, a power-off type electromagnet, an electromagnet driver, a third mounting plate, a transmission mechanism, a motor, a host computer, a motor controller, a power supply, a brake controller, a displacement sensor, and a data storage device. By using the present invention, a normal braking function can be achieved by controlling the rotation direction, speed, and angle of the motor; considering that the motor, the motor controller and other components may fail, the power-off type electromagnet is powered on and demagnetized, and the automobile can be emergency braked under the action of the tension spring, thereby improving driving safety; the data storage device can record key data during the working process of the device, which is convenient for users to do subsequent analysis. The present invention has the advantages of simple overall structure, reliability, and low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile test equipment, and in particular relates to a safety redundant brake control device and a control method for automobile testing. Technical Background

[0002] With the rapid development of the automobile industry, people's requirements for automobile driving safety are getting higher and higher, which requires a large number of reliability tests on automobiles. Traditional automobile tests are usually completed by human drivers, but human drivers have shortcomings such as low control accuracy and poor control repeatability. Therefore, it is urgent to use automatic driving devices with high control accuracy, good repeatability and strong durability to replace human drivers. At present, there is a great technical monopoly in foreign countries in automatic driving devices, and the price is expensive. In the test, the car needs to brake frequently, so it is of high engineering value to develop a brake control device.

[0003] In order to brake the vehicle during the automobile test, the more reliable, simple and direct solution is to control the movement of the brake master cylinder piston of the traditional hydraulic brake system of the vehicle; and the lower-cost solution is to use a host computer, a brake controller, a motor controller, a motor, a brake controller and a transmission mechanism. The host computer can send brake control information to the brake controller; the motor controller can obtain control information from the brake controller, and then control the rotation direction, speed, and angle of the motor; the transmission mechanism is used to reduce speed and increase torque and convert the rotational motion of the motor into linear motion; the linear motion of the transmission mechanism can drive the brake master cylinder piston to compress or relax, thereby braking or releasing the brake state of the vehicle.

[0004] For the solution, when the car needs to brake, if the motor or motor controller fails when the brake master cylinder piston is compressed, the brake master cylinder piston can remain compressed because the transmission mechanism has a self-locking feature, and the car can slow down and stop; if the motor or motor controller fails before the brake master cylinder piston is compressed, the device will be completely ineffective. At the same time, the solution lacks the displacement measurement information of the brake master cylinder piston, making it difficult to confirm whether the required braking effect has been achieved. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to design a safety redundant brake control device and control method for automobile testing, which can perform braking operations during the automobile testing process, and can still implement braking when some components used in the brake control device fail.

[0006] The present invention proposes a safety redundant brake control device for automobile testing, which is characterized by comprising a first mounting plate, a tension spring, a pin, a screw, a second mounting plate, a power-off type electromagnet, a third mounting plate, a transmission mechanism, a motor, a host computer, a motor controller, a brake controller, a power supply, an electromagnet driver, a displacement sensor, and a data storage device;

[0007] The first mounting plate is fixedly connected to the vehicle body through the mounting hole;

[0008] The first mounting plate is connected to the second mounting plate via a tension spring;

[0009] The second mounting plate is fixedly connected to the original brake master cylinder piston of the vehicle via a pin shaft;

[0010] The second mounting plate is fixedly connected to the power-off type electromagnet by screws;

[0011] The de-energized electromagnet is connected to an electromagnet driver;

[0012] When the power-off type electromagnet is powered off, it contacts the third mounting plate through the magnetic attraction of the power-off type electromagnet;

[0013] The third mounting plate is fixedly connected to the transmission mechanism by means of mechanical connection;

[0014] The transmission mechanism is connected to the motor by means of mechanical connection;

[0015] The motor is connected to a motor controller;

[0016] The brake controller communicates with the host computer by wireless communication;

[0017] The brake controller is connected to the motor controller and the data storage device via a communication line;

[0018] The brake controller is connected to the electromagnet driver and the displacement sensor via a signal line;

[0019] The power supply is used to supply power to the motor controller, the brake controller, the electromagnet driver, the displacement sensor and the data storage device.

[0020] Furthermore, the transmission mechanism has a self-locking characteristic, and also has the functions of reducing speed, increasing torque, and converting the rotational motion of the motor into linear motion.

[0021] Furthermore, the brake controller may communicate with a host computer to obtain control information, and then send the control information to the motor controller.

[0022] Furthermore, the electromagnet driver can obtain a control signal from the brake controller, and then control the power-off and power-on of the de-energized electromagnet to realize the presence or absence of magnetism of the de-energized electromagnet.

[0023] Furthermore, the motor controller can communicate with the brake controller to obtain control information, and then control the rotation direction, speed, and angle of the motor; the rotation of the motor is finally transmitted to the brake master cylinder piston through the transmission mechanism, the third mounting plate, the power-off electromagnet, the second mounting plate, the screw, and the pin shaft, thereby realizing the control of the movement direction, speed, and displacement of the brake master cylinder piston.

[0024] Furthermore, the displacement sensor is used to measure the displacement of the brake master cylinder piston.

[0025] Furthermore, the data storage device may store working information of the de-energized electromagnet, the motor, and the displacement sensor obtained by communicating with the brake controller.

[0026] This embodiment also provides a control method for a brake control device, characterized by comprising the following steps:

[0027] Step 1: De-energize the de-energized electromagnet;

[0028] Step 2: The brake controller receives control instructions from the host computer, and then sends control information to the motor controller. The motor controller drives the motor to work according to the received control information.

[0029] Step 3: The brake controller obtains first displacement information of the brake master cylinder piston from the displacement sensor;

[0030] Step 4: The brake controller obtains the second displacement information of the brake master cylinder piston after corresponding calculation of the control information sent to the motor controller;

[0031] Step 5: The brake controller calculates the error between the first displacement information and the second displacement information;

[0032] Step 6: The brake controller compares the error with a set threshold.

[0033] If the error is less than the set threshold, it can be considered that no component has failed, and return to step 2;

[0034] If the error is greater than or equal to the set threshold, it indicates that the motor, motor controller or displacement sensor may be faulty, and the process goes to step 7 and step 8;

[0035] Step 7: The brake controller can send a power-on signal of the de-energized electromagnet to the electromagnet driver through the signal line. After receiving the signal, the electromagnet driver powers on the de-energized electromagnet. By utilizing the characteristic of the de-energized electromagnet losing magnetism when it is powered on, the de-energized electromagnet loses its magnetism and no longer attracts the third mounting plate.

[0036] Step 8: The tension spring contracts, pulling the second mounting plate to compress the brake master cylinder piston. The contraction force of the tension spring is used to compress the brake master cylinder piston to the maximum stroke, causing emergency braking of the vehicle.

[0037] The advantages of the present invention are:

[0038] (1) The implementation is relatively easy, and braking can still be performed when a motor (15) or a motor controller (17) or a displacement sensor (21) used in the brake control device fails, thereby improving driving safety;

[0039] (2) In order to brake the vehicle during the vehicle test, a more reliable, simple and direct solution is to control the movement of the brake master cylinder piston of the traditional hydraulic brake system of the vehicle; BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a simple schematic diagram of a car's hydraulic brake system.

[0041] Figure 2 It is the overall scheme diagram of the brake control device proposed by the present invention.

[0042] Figure 3 It is an axonometric diagram of the brake control device proposed by the present invention.

[0043] Figure 4 It is an axonometric diagram of the brake control device proposed by the present invention.

[0044] Figure 5 It is a side view of the brake control device proposed by the present invention when the de-energized electromagnet (12) is energized.

[0045] Figure 6 It is a block diagram of the control method of the brake control device proposed by the present invention.

[0046] Among them: 1-right front wheel brake; 2-right rear wheel brake; 201-brake wheel cylinder; 202-wheel cylinder piston; 203-return spring; 204-brake shoe; 205-friction lining; 206-support pin; 207-brake drum; 3-left rear wheel brake; 4-brake pedal; 5-brake master cylinder; 501-brake master cylinder piston; 6-left front wheel brake; 7-first mounting plate; 8-tension spring; 9-pin shaft; 10-screw; 11-second mounting plate; 12-power-off type electromagnet; 13-third mounting plate; 14-transmission mechanism; 15-motor; 16-host computer; 17-motor controller; 18-brake controller; 19-power supply; 20-electromagnet driver; 21-displacement sensor; 22-data storage device. DETAILED DESCRIPTION

[0047] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] like Figure 1 As shown, when the car needs to brake, the driver presses the brake pedal 4, the brake master cylinder piston 501 is compressed to increase the brake fluid pressure, and the hydraulic pressure is transmitted to the brake wheel cylinder 201 through the hydraulic pipeline. Under the action of the brake fluid squeezing, the wheel cylinder piston 202 presses the friction lining 205 on the brake shoe 204 against the brake drum 207 to achieve braking.

[0049] It can be seen from the above description that the braking of the vehicle can be controlled as long as the movement of the brake master cylinder piston 501 is controlled. Therefore, this embodiment provides a safety redundant brake control device for vehicle testing, which controls the braking of the vehicle by controlling the movement of the brake master cylinder piston 501. It includes: a first mounting plate 7, a tension spring 8, a pin 9, a screw 10, a second mounting plate 11, a power-off type electromagnet 12, a third mounting plate 13, a transmission mechanism 14, a motor 15, a host computer 16, a motor controller 17, a brake controller 18, a power supply 19, an electromagnet driver 20, a displacement sensor 21, and a data storage device 22.

[0050] The first mounting plate 7 is fixedly connected to the vehicle body through the mounting hole;

[0051] The first mounting plate 7 is connected to the second mounting plate 11 via a tension spring 8;

[0052] The second mounting plate 11 is fixedly connected to the original brake master cylinder piston 501 of the vehicle via a pin 9;

[0053] The second mounting plate 11 is fixedly connected to the power-off type electromagnet 12 by means of screws 10;

[0054] The de-energized electromagnet 12 is connected to the electromagnet driver 20;

[0055] When the power-off type electromagnet 12 is powered off, it contacts the third mounting plate 13 through the magnetic attraction of the power-off type electromagnet 12;

[0056] The third mounting plate 13 is fixedly connected to the transmission mechanism 14 by mechanical connection;

[0057] The transmission mechanism 14 is connected to the motor 15 by mechanical connection;

[0058] The motor 15 is connected to a motor controller 17;

[0059] The brake controller 18 communicates with the host computer 16 by wireless communication;

[0060] The brake controller 18 is connected to the motor controller 17 and the data storage device 22 by means of a communication line;

[0061] The brake controller 18 is connected to the electromagnet driver 20 and the displacement sensor 21 via a signal line;

[0062] The power supply 19 supplies power to the motor controller 17 , the brake controller 18 , the electromagnet driver 20 , the displacement sensor 21 , and the data storage device 22 .

[0063] The transmission mechanism 14 has a self-locking characteristic, and also has the functions of reducing speed and increasing torque, and converting the rotational motion of the motor 15 into linear motion.

[0064] The brake controller 18 can communicate with the host computer 16 to obtain control information, and then send the control information to the motor controller 17.

[0065] The electromagnet driver 20 can obtain a control signal from the brake controller 18 , and then control the power-off and power-on of the de-energized electromagnet 12 , so as to realize the magnetic state of the de-energized electromagnet 12 .

[0066] The motor controller 17 can communicate with the brake controller 18 to obtain control information, and then control the rotation direction, speed, and angle of the motor 15; the rotation of the motor 15 is finally transmitted to the brake master cylinder piston 501 through the transmission mechanism 14, the third mounting plate 13, the power-off electromagnet 12, the second mounting plate 11, the screw 10, and the pin shaft 9, thereby realizing the control of the movement direction, speed, and displacement of the brake master cylinder piston 501.

[0067] The displacement sensor 21 is used to measure the displacement of the brake master cylinder piston 501 .

[0068] The data storage device 22 can store the working information of the de-energized electromagnet 12 , the motor 15 , the displacement sensor 21 and other components obtained by communicating with the brake controller 18 .

[0069] This embodiment also provides a control method for the device, which specifically includes the following steps:

[0070] Step 1: The power-off type electromagnet 12 is powered off;

[0071] Step 2: The brake controller 18 receives a control instruction from the host computer 16, and then sends control information to the motor controller 17. The motor controller 17 drives the motor 15 to work according to the received control information;

[0072] Step 3: The brake controller 18 obtains first displacement information of the brake master cylinder piston 501 from the displacement sensor 21;

[0073] Step 4: The brake controller 18 obtains the second displacement information of the brake master cylinder piston 501 after corresponding calculation of the control information sent to the motor controller 17;

[0074] Step 5: The brake controller 18 calculates the error between the first displacement information and the second displacement information;

[0075] Step 6: The brake controller 18 compares the error with a set threshold;

[0076] If the error is less than the set threshold, it can be considered that no component has failed, and return to step 2;

[0077] If the error is greater than or equal to the set threshold, it indicates that the motor 15 or the motor controller 17 or the displacement sensor 21 may be faulty, and the process goes to step 7 and step 8;

[0078] Step 7: The brake controller 18 can send a power-on signal to the electromagnet driver 20 through the signal line. After receiving the signal, the electromagnet driver 20 powers on the power-off electromagnet 12. By utilizing the property of the power-off electromagnet 12 losing magnetism when it is powered on, the power-off electromagnet 12 loses its magnetism and no longer attracts the third mounting plate 13.

[0079] Step 8: The tension spring 8 contracts, pulling the second mounting plate 11 to press the brake master cylinder piston 501, and the brake master cylinder piston 501 is compressed to the maximum stroke by the contraction force of the tension spring 8, so that the vehicle is emergency braked.

[0080] Finally, it should be noted that the above specific implementations are only used to illustrate the technical solutions of the present invention rather than to limit it. The specific implementation of the present invention is described in detail, but the content is only a preferred implementation of the present invention and cannot be considered to limit the scope of implementation of the present invention. Those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A safety redundant brake control device for automobile testing, characterized in that: The invention comprises a first mounting plate (7), a tension spring (8), a pin (9), a screw (10), a second mounting plate (11), a power-off type electromagnet (12), a third mounting plate (13), a transmission mechanism (14), a motor (15), a host computer (16), a motor controller (17), a brake controller (18), a power supply (19), an electromagnet driver (20), a displacement sensor (21), and a data storage device (22); The first mounting plate (7) is fixedly connected to the vehicle body via the mounting hole; The first mounting plate (7) is connected to the second mounting plate (11) via a tension spring (8); The second mounting plate (11) is fixedly connected to the original brake master cylinder piston (501) of the vehicle via a pin shaft (9); The second mounting plate (11) is fixedly connected to the power-off type electromagnet (12) via screws (10); The de-energized electromagnet (12) is connected to an electromagnet driver (20); When the power-off type electromagnet (12) is powered off, it contacts the third mounting plate (13) through the magnetic attraction of the power-off type electromagnet (12); The third mounting plate (13) is fixedly connected to the transmission mechanism (14) by means of mechanical connection; The transmission mechanism (14) is connected to the motor (15) by means of mechanical connection; The motor (15) is connected to a motor controller (17); The brake controller (18) communicates with the host computer (16) by wireless communication; The brake controller (18) is connected to the motor controller (17) and the data storage device (22) via a communication line; The brake controller (18) is connected to the electromagnet driver (20) and the displacement sensor (21) via a signal line; The power supply (19) supplies power to the motor controller (17), the brake controller (18), the electromagnet driver (20), the displacement sensor (21), and the data storage device (22).

2. The brake control device according to claim 1, characterized in that: The transmission mechanism (14) has a self-locking characteristic and also has the functions of reducing speed and increasing torque and converting the rotary motion of the motor (15) into linear motion.

3. The brake control device according to claim 1, characterized in that: The brake controller (18) can communicate with the host computer (16) to obtain control information, and then send the control information to the motor controller (17).

4. The brake control device according to claim 1, characterized in that: The electromagnet driver (20) can obtain a control signal from a brake controller (18), thereby controlling the power-off and power-on of the de-energized electromagnet (12), thereby realizing the presence or absence of magnetism of the de-energized electromagnet (12).

5. The brake control device according to claim 1, characterized in that: The motor controller (17) can communicate with the brake controller (18) to obtain control information, thereby controlling the rotation direction, rotation speed and rotation angle of the motor (15); the rotation of the motor (15) is finally transmitted to the brake master cylinder piston (501) through the transmission mechanism (14), the third mounting plate (13), the power-off type electromagnet (12), the second mounting plate (11), the screw (10) and the pin (9), thereby realizing the control of the movement direction, speed and displacement of the brake master cylinder piston (501).

6. The brake control device according to claim 1, characterized in that: The displacement sensor (21) is used to measure the displacement of the brake master cylinder piston (501).

7. The brake control device according to claim 1, characterized in that: The data storage device (22) can store the working information of the de-energized electromagnet (12), the motor (15), and the displacement sensor (21) obtained by communicating with the brake controller (18).

8. The control method of the brake control device according to claim 1, characterized in that The steps include: Step 1: De-energize the de-energized electromagnet (12); Step 2: The brake controller (18) receives a control instruction from the host computer (16), and then sends control information to the motor controller (17). The motor controller (17) drives the motor (15) to work according to the received control information; Step 3: The brake controller (18) obtains first displacement information of the brake master cylinder piston (501) from the displacement sensor (21); Step 4: The brake controller (18) obtains the second displacement information of the brake master cylinder piston (501) after corresponding calculation of the control information sent to the motor controller (17); Step 5: The brake controller (18) calculates the error between the first displacement information and the second displacement information; Step 6: The brake controller (18) compares the error with a set threshold; If the error is less than the set threshold, it can be considered that no component has failed, and return to step 2; If the error is greater than or equal to the set threshold, it indicates that the motor (15) or the motor controller (17) or the displacement sensor (21) may be faulty, and the process proceeds to step 7 and step 8; Step 7: The brake controller (18) can send a power-on signal to the electromagnet driver (20) through a signal line. After receiving the signal, the electromagnet driver (20) powers on the power-off electromagnet (12). By utilizing the property of the power-off electromagnet (12) that it loses magnetism when it is powered on, the power-off electromagnet (12) loses its magnetism and no longer attracts the third mounting plate (13). Step 8: The tension spring (8) contracts, pulling the second mounting plate (11) to press the brake master cylinder piston (501), and the brake master cylinder piston (501) is compressed to the maximum stroke by the contraction force of the tension spring (8), so that the vehicle is emergency braked.

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