CN117565845B - EPB drive circuit based on QM pre-drive chip - Google Patents
EPB drive circuit based on QM pre-drive chip Download PDFInfo
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- CN117565845B CN117565845B CN202410060005.7A CN202410060005A CN117565845B CN 117565845 B CN117565845 B CN 117565845B CN 202410060005 A CN202410060005 A CN 202410060005A CN 117565845 B CN117565845 B CN 117565845B
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- 239000003990 capacitor Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
The invention discloses an EPB driving circuit based on a QM pre-driving chip, which comprises: pre-driving the chip; the pre-driving chip is connected with a driving motor through an H-bridge circuit, and the running state of the driving motor is controlled by controlling the on state of the H-bridge circuit; the H-bridge circuit is connected with an external circuit, the external circuit is connected with an MCU processor, the external circuit is controlled to be conducted by the MCU processor to send a level signal, and when the pre-driving chip is in misoperation, the running state of the driving motor is kept unchanged; by designing an external circuit on the QM pre-driving chip with low safety level, the robustness of the chip in controlling the driving of the H bridge circuit is improved, the occurrence rate of misoperation is reduced, and the use cost is reduced.
Description
Technical Field
The invention relates to the technical field of intelligent braking of automobiles, in particular to an EPB driving circuit based on a QM pre-driving chip.
Background
An electronic parking brake system (EPB) is a function control module that has been widely used in the automotive field. And when the automobile stops, the electronic controller unit provides assistance for parking of the automobile and prevents the automobile from sliding. The external EPB switch is used for replacing the function of the traditional hand-pulled mechanical hand brake of the automobile. At present, the progress of automobile electronization is rapid, the complexity of the whole automobile system is higher and higher, and the requirements on functional safety are higher and higher.
At present, most part suppliers use a pre-driving chip meeting ASIL D standard to transfer the requirement of functional safety to the pre-driving chip, and the requirement of functional safety is met through a diagnosis detection circuit inside the chip meeting ASIL D standard.
While the QM chip can save a certain cost, there is a risk of false driving, resulting in false driving of the H-bridge: in the running process of the vehicle, the chip is driven by mistake, so that the EPB motor rotates positively, the caliper motor is clamped, the vehicle can lose balance, or when the vehicle is parked, the clamped caliper motor is released due to the false driving of the chip, and a landslide phenomenon occurs.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an EPB driving circuit based on a QM pre-driving chip.
In order to achieve the above purpose, the present invention adopts the following technical scheme: an EPB driving circuit based on QM pre-driving chip, comprising:
pre-driving the chip;
the pre-driving chip is connected with a driving motor through an H-bridge circuit, and the running state of the driving motor is controlled by controlling the on state of the H-bridge circuit;
the H-bridge circuit is connected with an external circuit, the external circuit is connected with an MCU processor, the MCU processor controls the external circuit to be conducted through an IO port, and when misoperation occurs on the pre-driving chip, the running state of the driving motor is kept unchanged.
As a further description of the above technical solution: the H bridge circuit comprises a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube, and drains of the first MOS tube and the second MOS tube are connected in parallel with a first power supply.
As a further description of the above technical solution: the source electrode of the first MOS tube is connected with the drain electrode of the third MOS tube, and the source electrode of the second MOS tube is connected with the drain electrode of the fourth MOS tube; and the source electrode of the third MOS tube and the source electrode of the fourth MOS tube are connected in parallel.
As a further description of the above technical solution: the pre-driving chip is provided with four level output ports which are respectively connected with the grid electrodes of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube.
As a further description of the above technical solution: the first MOS tube and the third MOS tube are connected with the positive electrode of the driving motor, and the second MOS tube and the fourth MOS tube are connected with the negative electrode of the driving motor.
As a further description of the above technical solution: the external circuit comprises a first triode, the collector electrode of the first triode is connected with the grid electrode of the third MOS tube, the emitting electrode of the first triode is grounded, and the base electrode of the first triode is connected with the IO port of the MCU processor.
As a further description of the above technical solution: the first resistor, the second resistor and the third resistor are connected in parallel between the collector electrode of the first triode and the grid electrode of the third MOS tube, the first resistor and the second resistor are connected in series, one side of the first resistor is connected with a second power supply, and the other side of the first resistor is grounded.
As a further description of the above technical solution: and the third resistor is connected with the first capacitor and the ADC acquisition end of the MCU processor.
As a further description of the above technical solution: the external circuit further comprises a second triode, the collector electrode of the second triode is connected with the grid electrode of the fourth MOS tube, the emitting electrode of the second triode is grounded, and the base electrode of the second triode is connected with the other IO port of the MCU processor.
As a further description of the above technical solution: a fourth resistor, a fifth resistor and a sixth resistor are connected in parallel between the collector electrode of the second triode and the grid electrode of the fourth MOS tube, the fourth resistor and the fifth resistor are connected in series, one side of the fourth resistor is connected with the second power supply, and the other side of the fourth resistor is grounded;
and the sixth resistor is connected with the second capacitor and the other ADC acquisition end of the MCU processor.
The technical scheme has the following advantages or beneficial effects:
1. by designing an external circuit on the QM pre-driving chip with low safety level, the robustness of the chip in controlling the driving of the H bridge circuit is improved, the occurrence rate of misoperation is reduced, and the use cost is reduced.
Drawings
FIG. 1 is a schematic circuit diagram of a driving circuit according to the present invention;
FIG. 2 is a schematic diagram of a driving motor forward rotation circuit according to the present invention;
FIG. 3 is a schematic diagram of the circuit principle of the reverse rotation of the driving motor in the invention;
FIG. 4 is a schematic diagram showing the result of failure analysis of the driving circuit according to the present invention.
Legend description:
1. pre-driving the chip; 2. a driving motor; 3. an MCU processor; 4. a first MOS tube; 5. a second MOS tube; 6. a third MOS tube; 7. a fourth MOS transistor; 8. a first power supply; 9. a level output port; 10. a first triode; 11. a first resistor; 12. a second resistor; 13. a third resistor; 14. a first capacitor; 15. a second triode; 16. a fourth resistor; 17. a fifth resistor; 18. a sixth resistor; 19. a second capacitor; 20. and a second power supply.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, one embodiment provided by the present invention is: an EPB driving circuit based on QM pre-driving chip, comprising: a pre-driving chip 1; the pre-driving chip 1 is connected with the driving motor 2 through an H-bridge circuit, and the running state of the driving motor 2 is controlled by controlling the on state of the H-bridge circuit; the H bridge circuit is connected with an external circuit, the external circuit is connected with the MCU processor 3, the MCU processor 3 controls the external circuit to be conducted through the IO port, and when misoperation occurs on the pre-driving chip 1, the running state of the driving motor 2 is kept unchanged.
The H bridge circuit comprises a first MOS tube 4, a second MOS tube 5, a third MOS tube 6 and a fourth MOS tube 7, wherein the drains of the first MOS tube 4 and the second MOS tube 5 are connected in parallel with a first power supply 8; the source electrode of the first MOS tube 4 is connected with the drain electrode of the third MOS tube 6, and the source electrode of the second MOS tube 5 is connected with the drain electrode of the fourth MOS tube 7; the source electrode of the third MOS tube 6 is connected with the source electrode of the fourth MOS tube 7 in parallel; the pre-driving chip 1 is provided with four level output ports 9 which are respectively connected with the grid electrodes of the first MOS tube 4, the second MOS tube 5, the third MOS tube 6 and the fourth MOS tube 7; the first MOS tube 4 and the third MOS tube 6 are connected with the positive electrode of the driving motor 2, and the second MOS tube 5 and the fourth MOS tube 7 are connected with the negative electrode of the driving motor.
In this embodiment, the EPB system sends a control instruction to the pre-driving chip 1, the pre-driving chip 1 is a QM pre-driving chip, preferably a pre-driving chip DRV8714 of texas instruments, and sends a level signal to the H-bridge circuit through the pre-driving chip 1 to control the on state of the MOS transistors in the H-bridge circuit, wherein the first MOS transistor 4, the second MOS transistor 5, the third MOS transistor 6 and the fourth MOS transistor 7 are NMOS transistors, and when the control instruction of the EPB is a standby command, the pre-driving chip does not drive the level output port 9 to act, and in this state, the driving motor 2 does not act;
referring to fig. 2, when the EPB control command is to pull up, the pre-driving chip 1 sends a high level to the first MOS transistor 4 and the fourth MOS transistor 7, so that the first MOS transistor 4 and the fourth MOS transistor 7 are turned on, and the driving motor 2 is controlled to rotate forward. The current from the first power supply 8 to the first MOS tube 4 enters the driving motor 2 through the positive pole M+ and flows through the fourth MOS tube 7 to the ground from the driving motor 2 to the negative pole M-, so as to form a loop, the driving motor 2 rotates positively, and the caliper motor of the EPB is clamped, so that the parking or braking function is realized.
Referring to fig. 3, when the control command of the EPB is release, the pre-driving chip 2 sends a high level to the second MOS transistor 5 and the third MOS transistor 6, so that the second MOS transistor 5 and the third MOS transistor 6 are turned on, and the motor is controlled to rotate reversely. The current enters the driving motor 2 from the first power supply 8 to the second MOS tube 5 through the negative electrode M-, and flows through the third MOS tube 6 to the ground from the driving motor 2 to the positive electrode M+ to form a loop, so that the driving motor 2 reversely rotates, the caliper motor is released, and the function of releasing the caliper motor is realized.
The external circuit comprises a first triode 10, the collector electrode of the first triode 10 is connected with the grid electrode of the third MOS tube 6, the emitter electrode of the first triode 10 is grounded, and the base electrode of the first triode 10 is connected with the IO port of the MCU processor 3; a first resistor 11, a second resistor 12 and a third resistor 13 are connected in parallel between the collector of the first triode 10 and the grid electrode of the third MOS tube 6, the first resistor 11 and the second resistor 12 are connected in series, one side is connected with a second power supply 20, and the other side is grounded; the third resistor 13 is connected with the first capacitor 14 and the ADC acquisition end of the MCU processor 3.
In this embodiment, the first triode 10 is detected, power is supplied through the second power supply 20, the resistance value of the first resistor 11 is R1, the resistance value of the second resistor 12 is R2, the voltage of the second power supply is U2, at this time, the voltage of the first triode 10 is U2×r2/(r1+r2), and voltage division is performed through the first resistor 11 and the second resistor 12; meanwhile, the voltage enters an ADC acquisition end of the MCU processor 3 through a third resistor 13 and a first capacitor 14 to sample the voltage, and the third resistor 13 and the first capacitor 14 form a first-order RC filter circuit to form stable voltage input.
The external circuit further comprises a second triode 15, the collector electrode of the second triode 15 is connected with the grid electrode of the fourth MOS tube 7, the emitter electrode of the second triode 15 is grounded, and the base electrode of the second triode 15 is connected with the other IO port of the MCU processor 3; a fourth resistor 16, a fifth resistor 17 and a sixth resistor 18 are connected in parallel between the collector of the second triode 15 and the grid electrode of the fourth MOS tube 7, the fourth resistor 16 and the fifth resistor 17 are connected in series, one side is connected with a second power supply 20, and the other side is grounded; the sixth resistor 18 is connected to the second capacitor 19 and the other ADC acquisition terminal of the MCU processor 3.
In this embodiment, the second transistor 15 is detected, and the detection circuit is the same as the circuit to which the first transistor 10 is connected.
When the control instruction of the EPB is a standby command, a high level, specifically a 3.3V level, is sent to the two IO ports through the MCU processor 3, and since the emitter of the triode is grounded, the base and the emitter of the triode have a 3.3V differential pressure, so that the first triode 10 and the second triode 15 are turned on, the level output port 9 is shorted to the ground, and the third MOS transistor 6 and the fourth MOS transistor 7 cannot be turned on, which results in that the driving motor 2 cannot perform forward and reverse rotation.
The first triode 10 and the second triode 15 are conducted, and the two level output ports 9 of the pre-driving chip 1, which are connected with the third MOS tube 6 and the fourth MOS tube 7, are directly grounded, so that the third MOS tube 6 and the fourth MOS tube 7 cannot be opened; at this time, the voltage acquired by the ADC acquisition end of the MCU processor 3 is 0v, and the MCU processor 3 is matched with the IO port command sent by the MCU processor 3 through monitoring the voltage of the ADC acquisition end, so as to realize closed-loop control of the circuit, and improve the safety level of the grounding circuit.
When the control instruction of the EPB is action or release, the MCU processor 3 sends low level to the two IO ports, so that the conduction voltage of the two level output ports 9 connecting the third MOS tube 6 and the fourth MOS tube 7 can be pulled up by the pre-driving chip 1, and the driving motor 2 is allowed to perform forward and reverse rotation operation, and the problem that the driving motor 2 is misoperation in the driving process is solved by the mode.
The judgment mode during detection is as follows:
when the IO port of the MCU processor 3 is not input with the level, detecting that the voltage of the ADC acquisition end of the MCU processor 3 is equal to VCC x R2/(R1+R2);
when the IO port of the MCU processor 3 outputs a 3.3V high level, detecting that the voltage of the ADC acquisition end of the MCU processor 3 is equal to 0V;
through the two tests, it is diagnosed whether the first transistor 10 or the second transistor 15 can work normally.
Through the diagnosis mode, the safety performance of the external circuit is improved, corresponding FMEDA (failure mode influence and diagnosis analysis) is carried out on the external circuit, a Medini analysis tool (a professional functional safety development platform tool, accords with the development flow of ISO 26262) is used for carrying out functional safety analysis and evaluation, and through the software analysis, the circuit calculation failure analysis designed by the invention is 99.57429% (refer to FIG. 4) and accords with the standard of ASIL D.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (5)
1. An EPB driving circuit based on QM pre-driving chip, comprising:
a pre-drive chip (1);
the pre-driving chip (1) is connected with the driving motor (2) through an H-bridge circuit, and the running state of the driving motor (2) is controlled by controlling the on state of the H-bridge circuit;
the H-bridge circuit is connected with an external circuit, the external circuit is connected with an MCU processor (3), the MCU processor (3) controls the external circuit to be conducted through an IO port, and when the pre-driving chip (1) is in misoperation, the running state of the driving motor (2) is kept unchanged;
the H bridge circuit comprises a first MOS tube (4), a second MOS tube (5), a third MOS tube (6) and a fourth MOS tube (7), wherein drains of the first MOS tube (4) and the second MOS tube (5) are connected in parallel with a first power supply (8);
the pre-driving chip (1) is provided with four level output ports (9) which are respectively connected with the grid electrodes of the first MOS tube (4), the second MOS tube (5), the third MOS tube (6) and the fourth MOS tube (7);
the external circuit comprises a first triode (10), wherein a collector electrode of the first triode (10) is connected with a grid electrode of the third MOS tube (6), an emitting electrode of the first triode (10) is grounded, and a base electrode of the first triode (10) is connected with an IO port of the MCU processor (3);
a first resistor (11), a second resistor (12) and a third resistor (13) are connected in parallel between the collector of the first triode (10) and the grid electrode of the third MOS tube (6), the first resistor (11) and the second resistor (12) are connected in series, one side of the first resistor is connected with a second power supply (20), and the other side of the first resistor is grounded;
the external circuit further comprises a second triode (15), wherein a collector electrode of the second triode (15) is connected with a grid electrode of the fourth MOS tube (7), an emitting electrode of the second triode (15) is grounded, and a base electrode of the second triode (15) is connected with another IO port of the MCU processor (3).
2. The EPB driving circuit based on a QM pre-driving chip according to claim 1, wherein: the source electrode of the first MOS tube (4) is connected with the drain electrode of the third MOS tube (6), and the source electrode of the second MOS tube (5) is connected with the drain electrode of the fourth MOS tube (7); the source electrode of the third MOS tube (6) and the source electrode of the fourth MOS tube (7) are connected in parallel.
3. The EPB driving circuit based on a QM pre-driving chip according to claim 1, wherein: the positive electrode of the driving motor (2) is connected between the first MOS tube (4) and the third MOS tube (6), and the negative electrode of the driving motor is connected between the second MOS tube (5) and the fourth MOS tube (7).
4. The EPB driving circuit based on a QM pre-driving chip according to claim 1, wherein: the third resistor (13) is connected with the first capacitor (14) and the ADC acquisition end of the MCU processor (3).
5. The EPB driving circuit based on a QM pre-driving chip according to claim 1, wherein: a fourth resistor (16), a fifth resistor (17) and a sixth resistor (18) are connected in parallel between the collector of the second triode (15) and the grid electrode of the fourth MOS tube (7), the fourth resistor (16) and the fifth resistor (17) are connected in series, one side is connected with the second power supply (20), and the other side is grounded;
the sixth resistor (18) is connected with the second capacitor (19) and the other ADC acquisition end of the MCU processor (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410060005.7A CN117565845B (en) | 2024-01-16 | 2024-01-16 | EPB drive circuit based on QM pre-drive chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410060005.7A CN117565845B (en) | 2024-01-16 | 2024-01-16 | EPB drive circuit based on QM pre-drive chip |
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| Publication Number | Publication Date |
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| CN117565845A CN117565845A (en) | 2024-02-20 |
| CN117565845B true CN117565845B (en) | 2024-04-05 |
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| CN202410060005.7A Active CN117565845B (en) | 2024-01-16 | 2024-01-16 | EPB drive circuit based on QM pre-drive chip |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140081375A (en) * | 2012-12-21 | 2014-07-01 | 현대모비스 주식회사 | Electronic Parking brake |
| CN104252840A (en) * | 2014-09-11 | 2014-12-31 | 天津三星电子有限公司 | Driving circuit |
| CN109194116A (en) * | 2018-09-18 | 2019-01-11 | 昆明理工大学 | A kind of half-bridge circuit parallel passive flow equalizing circuit |
| CN210653289U (en) * | 2019-06-27 | 2020-06-02 | 株洲易力达机电有限公司 | Integrated single-chip EPS controller |
| CN211319019U (en) * | 2019-11-28 | 2020-08-21 | 浙江亚太机电股份有限公司 | EPB electronic control unit circuit topological structure with automobile function safety design |
| CN113485181A (en) * | 2021-06-30 | 2021-10-08 | 浙江中控技术股份有限公司 | Communication bus control system based on fault detection |
| CN116300647A (en) * | 2023-04-03 | 2023-06-23 | 上海泰矽微电子有限公司 | Controller for automobile, chip, automobile control system and automobile |
-
2024
- 2024-01-16 CN CN202410060005.7A patent/CN117565845B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140081375A (en) * | 2012-12-21 | 2014-07-01 | 현대모비스 주식회사 | Electronic Parking brake |
| CN104252840A (en) * | 2014-09-11 | 2014-12-31 | 天津三星电子有限公司 | Driving circuit |
| CN109194116A (en) * | 2018-09-18 | 2019-01-11 | 昆明理工大学 | A kind of half-bridge circuit parallel passive flow equalizing circuit |
| CN210653289U (en) * | 2019-06-27 | 2020-06-02 | 株洲易力达机电有限公司 | Integrated single-chip EPS controller |
| CN211319019U (en) * | 2019-11-28 | 2020-08-21 | 浙江亚太机电股份有限公司 | EPB electronic control unit circuit topological structure with automobile function safety design |
| CN113485181A (en) * | 2021-06-30 | 2021-10-08 | 浙江中控技术股份有限公司 | Communication bus control system based on fault detection |
| CN116300647A (en) * | 2023-04-03 | 2023-06-23 | 上海泰矽微电子有限公司 | Controller for automobile, chip, automobile control system and automobile |
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| CN117565845A (en) | 2024-02-20 |
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