Switching circuit, motor control device and parking control system

Abstract

The utility model provides a switching circuit. The switching circuit comprises a first delay unit, a second delay unit, a first switch unit and a second switch unit, the first delay unit comprises a first resistor, a second resistor, a first diode and a first capacitor, the input end of the first delay unit receives a first input electric signal, the first delay unit comprises a first resistor, a second resistor, a first diode and a first capacitor, and the anode of the first diode is connected with the first end of the second resistor; the cathode of the first diode is connected with the control end of the first switch unit through the first resistor, and the second end of the second resistor is connected with the first end of the first capacitor and serves as the output end of the first delay unit to be connected with the input end of the first switch unit. And the internal structure of the second delay unit is the same as that of the first delay unit. Therefore, the stability and the flexibility of the control driving circuit can be improved, and the reliability of the electronic parking system can be enhanced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electronic parking control, and particularly relates to a switching circuit, a motor control device and a parking control system. BACKGROUND

[0002] At present, the automobile industry is developing towards electrification and intelligentization, and the demand for new energy vehicles is increasing. In the process of electrification of vehicles, as the degree of electronicization of automobiles is increasingly high, electronic parking systems gradually replace traditional mechanical hand brakes and become indispensable key components in modern vehicles.

[0003] However, once the existing electronic parking system fails, it may cause serious safety hazards, and the reliability of the electronic parking system is not high. CONTENT OF THE INVENTION

[0004] To solve the above technical problems, the application provides a switching circuit, a motor control device and a parking control system. By designing two independent redundant control paths of the main and auxiliary paths, when the main path control (i.e. the control path corresponding to the main control chip) fails, the auxiliary path control (i.e. the control path corresponding to the auxiliary control chip) can still work normally, thereby enhancing the reliability of the electronic parking system of the whole vehicle and improving the reliability of the electronic parking system.

[0005] To achieve the above effects, the application adopts the following technical solutions:

[0006] The application provides a switching circuit, which comprises a first delay unit, a second delay unit, a first switch unit and a second switch unit. The input end of the first delay unit receives a first input electrical signal. The first delay unit comprises a first resistor, a second resistor, a first diode and a first capacitor. The anode of the first diode is connected to the first end of the second resistor as the input end of the first delay unit. The cathode of the first diode is connected to the control end of the first switch unit through the first resistor. The second end of the second resistor is connected to the first end of the first capacitor and connected to the output end of the first delay unit and the input end of the first switch unit. The second end of the first capacitor is grounded. The input end of the second delay unit receives a second input electrical signal. The output end of the second delay unit is connected to the control end of the second switch unit. The internal structure of the second delay unit is the same as that of the first delay unit. The first path end of the first switch unit is connected to a main control chip. The second path end of the first switch unit is connected to a driving circuit of a motor. The first path end of the second switch unit is connected to an auxiliary control chip. The second path end of the second switch unit is connected to the driving circuit.

[0007] Preferably, the switching circuit changes the time length required for turning on the main control chip and the driving circuit to off, which is less than the time length required for turning off the auxiliary control chip and the driving circuit to on.

[0008] Preferably, the first switch unit and the second switch unit have the same structure.

[0009] Preferably, the second delay unit comprises a second diode, a third resistor, a fourth resistor and a second capacitor, the third resistor has the same resistance as the first resistor, the fourth resistor has the same resistance as the second resistor, and the second capacitor has the same capacitance as the first capacitor; and the resistance of the first resistor is smaller than the resistance of the fourth resistor.

[0010] Preferably, the first delay unit and the second delay unit are respectively connected to an electrical signal providing circuit, for receiving a first input electrical signal and a second input electrical signal output by the electrical signal providing circuit, wherein the rising edge of the first input electrical signal corresponds to the same time as the falling edge of the second input electrical signal.

[0011] Preferably, the electrical signal providing circuit comprises a first output end and a second output end, and the first output end is connected to the first delay unit and the second output end is connected to the second delay unit.

[0012] The application further provides an electronic parking control system, comprising the motor control device.

[0013] Preferably, the first switch unit and the second switch unit are both 8-channel switches; the two ends of the 8-channel switch of the first switch unit are respectively connected to the main control chip and the driving circuit; and the two ends of the 8-channel switch of the second switch unit are connected to the auxiliary control chip and the driving circuit.

[0014] Preferably, the electronic parking control system comprises the motor control device.

[0015] Preferably, the electronic parking control system further comprises a left caliper and a right caliper, both of which are driven by a motor; the motor control device is connected to the right caliper motor of the electronic parking control system; and the left caliper motor of the electronic parking control system is directly connected to the main control chip.

[0016] In the switching circuit, motor control device, and parking control system provided in this application, the switching circuit is connected to the main control chip and the auxiliary control chip. It can control whether the first switching unit is turned on through the first delay unit, thereby controlling whether the main control chip is connected to the motor drive circuit. It can also control whether the second switching unit is turned on through the second delay unit, thereby controlling whether the auxiliary control chip is connected to the motor drive circuit. Therefore, by designing two independent redundant control paths, this application can ensure that the auxiliary control (i.e., the control path corresponding to the main control chip) can still work normally when the main control (i.e., the control path corresponding to the main control chip) fails, thereby improving the stability and flexibility of the control drive circuit and enhancing the reliability of the vehicle electronic parking system.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the specific embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure and connection relationship of a switching circuit according to an example of this application.

[0019] Among them, 11-first delay unit, D1-first diode, R1-first resistor, R2-second resistor, C1-first capacitor, 12-second delay unit, D2-second diode, R3-third resistor, R4-fourth resistor, C2-second capacitor, 13-first switch unit, 14-second switch unit, 20-electrical signal supply circuit, 30-main control chip, 40-auxiliary control chip, 50-drive circuit, 60-H-bridge circuit, 70-motor. Detailed Implementation

[0020] To facilitate understanding of this application, a more comprehensive description of this application will be provided below with reference to the accompanying drawings. Specific embodiments of this application are shown in the drawings, and a detailed description of this application is provided below in conjunction with the following drawings and examples.

[0021] This application provides a switching circuit, which includes a main control circuit and an auxiliary control circuit. The main control circuit is connected to a main control chip and is used to control whether the main control chip is connected to the drive circuit of the motor. The auxiliary control circuit is connected to an auxiliary control chip and is used to control whether the auxiliary control chip is connected to the drive circuit of the motor.

[0022] Among them, such as Figure 1 As shown, the main control circuit includes a first delay unit 11 and a first switching unit 13, and the auxiliary control circuit includes a second delay unit 12 and a second switching unit 14.

[0023] The input end of the first delay unit 11 receives a first input electric signal from the electric signal providing circuit 20. The first delay unit 11 comprises a first resistor R1, a second resistor R2, a first diode D1 and a first capacitor C1. The anode of the first diode D1 is connected to the first end of the second resistor R2 as the input end of the first delay unit 11. The cathode of the first diode D1 is connected to the first resistor R1 and the control end of the first switch unit 13. The second end of the second resistor R2 is connected to the first end of the first capacitor C1 as the output end of the first delay unit 11 and the input end of the first switch unit 13. The second end of the first capacitor C1 is grounded.

[0024] The input end of the second delay unit 12 receives a second input electric signal from the electric signal providing circuit 20. The output end of the second delay unit 12 is connected to the control end of the second switch unit 14. The internal structure of the second delay unit 12 is the same as that of the first delay unit 11. That is, the types of the elements in the second delay unit 12 are the same as those in the first delay unit 11, and the connection relationship between the elements in the second delay unit 12 is also the same as that in the first delay unit 11. Specifically, the second delay unit 12 comprises a second diode D2, a third resistor R3, a fourth resistor R4 and a second capacitor C2.

[0025] The first pass-through end of the first switch unit 13 is connected to the main control chip 30, and the second pass-through end of the first switch unit 13 is connected to the driving circuit of the motor. The first pass-through end of the second switch unit 14 is connected to the auxiliary control chip 40, and the second pass-through end of the second switch unit 14 is connected to the driving circuit.

[0026] The first delay unit 11 can delay the first input electric signal to output a first delay signal. The control end of the first switch unit 13 receives the first delay signal and controls the conduction or cutoff of itself according to the input first delay signal, thereby controlling the on-off of the main control chip 30 and the driving circuit 50. Similarly, the second delay unit 12 can delay the second input electric signal to output a second delay signal. The control end of the second switch unit 14 receives the second delay signal and controls the conduction or cutoff of itself according to the input first delay signal, thereby controlling the on-off of the auxiliary control chip and the driving circuit.

[0027] In an embodiment, the switching circuit makes the time length required for the main control chip 30 and the driving circuit 50 to change from conduction to cutoff less than the time length required for the auxiliary control chip 40 and the driving circuit 50 to change from cutoff to conduction. In this way, there is a certain dead time between the main control chip and the auxiliary control chip, which can avoid the coupling interference caused by the main control chip 30 and the auxiliary control chip 40 outputting control signals to the driving circuit at the same time.

[0028] In an embodiment, the first switch unit 13 and the second switch unit 14 are completely identical in structure, for example, both can be P-type field effect tubes of the same model. In other embodiments, the first switch unit 13 and the second switch unit 14 can not be completely identical in structure, for example, the first switch unit 13 is an N-type field effect tube and the second switch unit is a P-type field effect tube.

[0029] In an embodiment, if the first switch unit 13 and the second switch unit 14 are completely identical in structure, the charging rate of the first capacitor C1 in the switching circuit is higher than the discharging rate of the second capacitor C2, which can make the rate of the first switch unit 13 changing from conducting to non-conducting less than the rate of the second switch unit 14 changing from non-conducting to conducting, so that the time length required for the master control chip 30 and the driving circuit 50 changing from conducting to non-conducting is less than the time length required for the auxiliary control chip 40 and the driving circuit 50 changing from non-conducting to conducting. Since the charging rate of the first capacitor C1 is related to the resistance values of the first resistor R1 and the second resistor R2 and the capacitance value of the first capacitor C1, and the discharging rate of the second capacitor C2 is related to the resistance values of the third resistor R3 and the fourth resistor R4 and the capacitance value of the second capacitor C2, in an embodiment, the resistance value of the third resistor R3 in the switching circuit is the same as the resistance value of the first resistor R1, the resistance value of the fourth resistor R4 is the same as the resistance value of the second resistor R2, the capacitance value of the second capacitor C2 is the same as the capacitance value of the first capacitor C1, and the resistance value of the first resistor R1 is less than the resistance value of the fourth resistor R4, so that the charging rate of the first capacitor C1 is higher than the discharging rate of the second capacitor C2. Specifically, for example, two capacitors of the same model can be set as the first capacitor C1 and the second capacitor C2 respectively, so that the capacitance value of the first capacitor C1 is the same as the capacitance value of the second capacitor C2. For another example, two of the six resistors of the same model can be connected in series as the second resistor R2, another two of the six resistors of the same model can be connected in series as the fourth resistor R4, and the remaining two of the six resistors of the same model can be connected as the first resistor R1 and the third resistor R3 respectively, so that the resistance value of the third resistor R3 is the same as the resistance value of the first resistor R1, the resistance value of the fourth resistor R4 is the same as the resistance value of the second resistor R2, and the resistance value of the first resistor R1 is less than the resistance value of the fourth resistor R4.

[0030] In an embodiment, the first delay unit 11 and the second delay unit 12 are connected to the electrical signal providing circuit 20 respectively, for receiving the first input electrical signal and the second input electrical signal outputted by the electrical signal providing circuit 20, wherein the rising edge of the first input electrical signal outputted by the electrical signal providing circuit 20 corresponds to the same time as the falling edge of the second input electrical signal. In other embodiments, the falling edge of the first input electrical signal outputted by the electrical signal providing circuit 20 corresponds to the same time as the rising edge of the second input electrical signal. Specifically, in an embodiment, the electrical signal providing circuit 20 comprises a first output end and a second output end, the first output end is connected to the input end of the first delay unit 11, and the second output end is connected to the input end of the second delay unit 12. In an embodiment, the electrical signal providing circuit 20 can be an inverter, a common emitter amplifier, a ring oscillator configured with an XOR gate, etc. which can output two electrical signals with opposite levels at the same time.

[0031] Specifically, the electrical signal providing circuit 20 can be connected to the function self-checking pin of the master chip 30 (not shown in the figure), and determine whether the master chip is failed, and simultaneously convert the levels of the first input electrical signal and the second input electrical signal when the master chip is failed. For example, the level of the first input electrical signal is changed from low level to high level, and the level of the second input electrical signal is changed from high level to low level.

[0032] Specifically, the first switch unit 13 and the second switch unit 14 are low level enable switches with the same structure, the first delay unit 11 and the second delay unit 12 have the same structure, and the charging rate of the first capacitor C1 in the switching circuit is higher than the discharging rate of the second capacitor C2. Taking this as an example, the principle of the switching circuit of the present application is described as follows:

[0033] In a default state, i.e. a normal state, the first input electrical signal output by the electrical signal providing circuit 20 is low, the second input electrical signal is high, the first delay signal received by the control end of the first switch unit 13 is low, so that the first switch unit 13 remains in a conducting state, the main control chip 30 and the driving circuit 50 can communicate through the conducting first switch unit 13, the first delay signal received by the control end of the second switch unit 14 is high, so that the second switch unit 14 remains in a cut-off state, the auxiliary control chip 40 and the driving circuit are in a disconnected state; when the main control chip fails, the first input electrical signal output by the electrical signal providing circuit 20 jumps from low to high, the second input electrical signal output by the electrical signal providing circuit 20 jumps from high to low, the first capacitor C1 in the first delay circuit 11 charges rapidly, the second capacitor C2 in the second delay circuit 12 discharges slowly, the time for the control end of the first switch unit 13 to change from low to high is less than the time for the control end of the second switch unit 13 to change from high to low, therefore, the time for the first switch unit 13 to change from conducting to cut-off is less than the time for the second switch unit 14 to change from cut-off to conducting, so that the time for the main control chip 30 and the driving circuit 50 to change from conducting to cut-off is less than the time for the auxiliary control chip 40 and the driving circuit to change from cut-off to conducting. That is to say, in terms of timing, the disconnection of the main control chip 30 and the enablement of the auxiliary control chip 40 exist a time difference, and there is no situation that the main control chip 30 and the auxiliary control chip 40 are simultaneously conducting with the driving circuit 50, i.e. during the main- auxiliary switching process, there is a dead time in which the main control chip 30 and the auxiliary control chip 40 are both disconnected, therefore, the switching circuit of the embodiment of the application can prevent coupling interference on the control of the driving circuit 50.

[0034] The application further provides a motor control device, which comprises a main control chip, an auxiliary control chip, and the switching circuit, the driving circuit and the electrical signal providing circuit.

[0035] In an embodiment, the first switch unit 13 and the second switch unit 14 are both 8-channel switches, and the two ends of the 8-channel switch of the first switch unit 13 are respectively connected to the main control chip 30 and the driving circuit 50. The two ends of the 8-channel switch of the second switch unit 14 are connected to the auxiliary control chip 40 and the driving circuit 50.

[0036] Preferably, the first switch unit 13 and the second switch unit 14 are 8-channel chip select chips, and the 8 channels of the first switch unit 13 respectively connect the communication signal, the reset signal, the driving signal and the shutdown signal of the main control chip 30 to the first input end of the driving circuit 50, and the 8 channels of the second switch unit 14 respectively connect the communication signal, the reset signal, the driving signal and the shutdown signal of the auxiliary control chip 40 to the second input end of the driving circuit 50.

[0037] The application also provides an electronic parking control system, and the caliper motor control system of the electronic parking control system is the motor control device.

[0038] In an embodiment, the motor control device can provide control for the right motor of the electronic parking control system, and the left motor of the electronic parking control system is directly connected to the master chip in the motor control device.

[0039] In the switching circuit, the motor control device and the parking control system provided by the application, the switching circuit is connected with the master chip and the auxiliary chip, and can control whether the first switch unit is turned on through the first delay unit, so as to control whether the master chip is connected with the driving circuit of the motor, and can also control whether the second switch unit is turned on through the second delay unit, so as to control whether the auxiliary chip is connected with the driving circuit of the motor. Therefore, by designing two independent redundant control paths of the master and the auxiliary, the auxiliary control path can still work normally when the master control path (i.e. the control path corresponding to the master chip) fails, so as to improve the stability and flexibility of the control driving circuit, and further enhance the reliability of the electronic parking system of the whole vehicle.

[0040] The above is only a preferred embodiment of the application, and does not limit the application in any form. Although the application has been disclosed as above, it is not intended to limit the application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the application, and any simple modification, equivalent change and modification made on the basis of the technical essence of the application to the above embodiment are still within the scope of the application.

Claims

1. A switching circuit, characterized by, The switching circuit comprises a first delay unit, a second delay unit, a first switch unit and a second switch unit: The input end of the first delay unit receives a first input electric signal, the first delay unit comprises a first resistor, a second resistor, a first diode and a first capacitor, the anode of the first diode is connected with the first end of the second resistor as the input end of the first delay unit, the cathode of the first diode is connected with the control end of the first switch unit through the first resistor, the second end of the second resistor is connected with the first end of the first capacitor and connected with the output end of the first delay unit and the input end of the first switch unit, and the second end of the first capacitor is grounded; The input end of the second delay unit receives a second input electric signal, the output end of the second delay unit is connected with the control end of the second switch unit, and the internal structure of the second delay unit is the same as that of the first delay unit; The first passage end of the first switch unit is connected with a master control chip, and the second passage end of the first switch unit is connected with a driving circuit of a motor; The first passage end of the second switch unit is connected with an auxiliary control chip, and the second passage end of the second switch unit is connected with the driving circuit.

2. The switching circuit of claim 1, wherein, The switching circuit needs a time length less than that required for changing the auxiliary control chip and the driving circuit from cut-off to conduction, to change the master control chip and the driving circuit from conduction to cut-off.

3. The switching circuit of claim 1 or 2, wherein The first switch unit and the second switch unit have the same structure.

4. The switching circuit of claim 1 or 2, wherein The second delay unit comprises a second diode, a third resistor, a fourth resistor and a second capacitor, the resistance value of the third resistor is the same as that of the first resistor, the resistance value of the fourth resistor is the same as that of the second resistor, and the capacitance value of the second capacitor is the same as that of the first capacitor. The resistance value of the first resistor is less than that of the fourth resistor.

5. The switching circuit of claim 1 or 2, wherein The first delay unit and the second delay unit are respectively connected with an electric signal providing circuit, for receiving the first input electric signal and the second input electric signal output by the electric signal providing circuit, wherein the rising edge of the first input electric signal corresponds to the same time as the falling edge of the second input electric signal.

6. The switching circuit of claim 5, wherein, The electric signal providing circuit comprises a first output end and a second output end, the first output end is connected with the input end of the first delay unit, and the second output end is connected with the input end of the second delay unit.

7. An electric motor control device characterized by comprising: The motor control device comprises a master control chip, an auxiliary control chip, the switching circuit, a driving circuit and an electric signal providing circuit.

8. The motor control apparatus of claim 7 wherein: The first switch unit and the second switch unit are both 8-passage switches, the two ends of the 8-passage switch of the first switch unit are respectively connected with the master control chip and the driving circuit, and the two ends of the 8-passage switch of the second switch unit are respectively connected with the auxiliary control chip and the driving circuit.

9. An electronic parking control system characterized by, The electronic parking control system comprises the motor control device according to any one of claims 7-8.

10. The electronic park control system of claim 9, wherein, The electronic parking control system further comprises a left caliper and a right caliper, both of which are driven by a motor, the motor control device is connected with the right caliper motor of the electronic parking control system, and the left caliper motor of the electronic parking control system is directly connected with the master control chip.

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