CN111301383B - Plateau-adaptive new energy vehicle vacuum pump control method - Google Patents
Plateau-adaptive new energy vehicle vacuum pump control method Download PDFInfo
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- CN111301383B CN111301383B CN201911071182.0A CN201911071182A CN111301383B CN 111301383 B CN111301383 B CN 111301383B CN 201911071182 A CN201911071182 A CN 201911071182A CN 111301383 B CN111301383 B CN 111301383B
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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
- B60T13/10—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 fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/72—Electrical control in fluid-pressure brake systems in vacuum systems or vacuum booster units
-
- 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
- B60T13/10—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 fluid assistance, drive, or release
- B60T13/24—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 fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a plateau-adaptive new energy vehicle vacuum pump control method, which comprises the following steps: recording time and a vacuum value under the condition that a brake pedal is released and a vacuum pump is in a working state, judging the current working state and controlling the vacuum pump to be opened and closed; if the abnormal condition is found, the leakage judgment is carried out, and the set vacuum degree value is alarmed or adjusted according to the judgment result; judging the current working state and controlling the vacuum pump to be opened and closed under the condition that the brake pedal is stepped on and the vacuum pump is in the working state; and if the state of the brake pedal changes during the judgment period, automatically switching the judgment step. The method is based on a single differential pressure sensor and is controlled according to a specific logic control method, so that the vacuum pump can normally extract the vacuum degree meeting the requirement in plain and plateau environments, the production cost is reduced, and the popularization of new energy automobiles is facilitated.
Description
Technical Field
The invention relates to the field of automobile power-assisted braking systems, in particular to a control method of a vacuum pump of a new energy automobile, which is suitable for the plateau.
Background
With the continuous development of green energy, the popularization of electric vehicles is wider and wider, and the technology of electric vehicles is also continuously developed. The traditional fuel vehicle provides vacuum for the traditional vacuum booster through an engine intake manifold, and the new energy electric vehicle realizes the same function through a vacuum pump. The vacuum pump needs to control opening and closing of the vacuum pump based on a vacuum degree sensor and an additional controller, and in order to adapt to a high altitude area, two sensors are generally needed to control the vacuum pump, one sensor is used for detecting the pressure inside a vacuum booster, the other sensor is used for detecting the pressure value of the atmospheric environment, and adjustment and control of vacuum opening and closing threshold values are realized through the two values, so that the vacuum pump can normally work under each altitude height and meet braking boosting requirements.
Chinese patent document CN109572649A discloses an "electric vacuum pump control device adapted to plateau and plain areas". The vacuum booster comprises a shell, a cover plate, a vacuum booster, a controller, a circuit board seat, a circuit board, an electric appliance connecting contact pin, a first absolute pressure vacuum sensor, a second absolute pressure vacuum sensor, a silica gel sealing gasket II, a waterproof breathable film, a circuit board seat and a waterproof gasket II. The device has adopted the inside and outside pressure of two sensor vacuum boosters for the cost increases.
Disclosure of Invention
The invention mainly solves the technical problem of high cost of the original two sensors, provides the vacuum pump control method of the new energy vehicle adaptive to the plateau, ensures that the vacuum pump normally pumps the vacuum degree meeting the requirement in the plain and plateau environment based on the single differential pressure sensor and according to the specific logic control method, reduces the production cost, and is beneficial to the popularization of the new energy vehicle.
The technical problem of the invention is mainly solved by the following technical scheme: the invention comprises the following steps:
(1) when the brake pedal is released and the vacuum pump is in an operating state, a timer t1 is started and a vacuum value VAC at the start is recorded1；
(2) Vacuum value at the beginning VAC1Comparing with 0.3P and classifying;
(3) controlling the vacuum pump to be opened and closed according to the classification and the working state of the vacuum pump and recording the vacuum value VAC when the vacuum pump stops2If the brake pedal is stepped down before the vacuum pump stops working, timing is cancelled, the step (6) is carried out, otherwise, the step is carried out according to the vacuum value VAC1Judging to transfer to the step (4) or the step (5) according to the comparison result with 0.3P;
(4) vacuum value VAC at the beginning if the brake pedal is not depressed1If greater than 0.3P, start timing t2And performing leakage judgment;
(5) if the brake pedal is released and the vacuum value VAC at the beginning is1Not more than 0.3P, start timing t3And performing leakage judgment;
(6) when the brake pedal is depressed and the vacuum pump is in an operating state, a timer t is started4And recording the vacuum value VAC at the beginning1；
(7) And controlling the opening and closing of the vacuum pump according to the working state of the vacuum pump.
Preferably, the classification manner of step (2) is as follows: VAC if starting timing1If > 0.3P is A type, VAC if timing is started1P is less than or equal to 0.3 and is B.
Preferably, theStep (3) A, stopping the vacuum pump when the vacuum pump is fully operated for 13s and does not reach the closing threshold value of 0.7P, and recording the vacuum value VAC when the pump stops2(ii) a Stopping the vacuum pump when the vacuum pump is fully operated for 15s and does not reach the closing threshold value of 0.7P under the B-type condition, and recording the vacuum value VAC when the pump stops2。
Preferably, said step (3) is carried out if 0.3P < VAC2< 0.45P, instrument prompt: low vacuum assistance.
Preferably, said step (4) is carried out if t2When the pressure drop value is less than or equal to 0.02P for 5s, VAConWhen V is less than or equal to 40km/h, the larger one of (VAC-0.25P) and 0.25P is set, namely VAConAt V>Set to be the larger one of (VAC-0.15P) and 0.25P at 40 km/h; if t2Depression of the brake pedal < 5s, VAConAnd setting according to the rule.
Preferably, said step (4) is carried out if t25s and pressure drop value delta > 0.02P, restart count after the whole car restarts continuously three times and detect the same result, then the instrument prompts alarm information: vacuum leakage, and vehicle speed V is limited to be less than or equal to 40km/h, and VAC is adoptedonWhen V is less than or equal to 40km/h, the larger one of (VAC-0.1P) and 0.25P is set, namely VAConAt V>The value is set to be the larger one of (VAC-0.05P) and 0.25P at 40 km/h.
Preferably, said step (5) is carried out if t2And 5s and the pressure drop value delta is less than or equal to 0.02P, then the instrument prompts alarm information: the vacuum is insufficient, the vehicle speed V is limited to be less than or equal to 40km/h, VACON is set to be the larger one of (VAC-0.05P) and 0.2P, otherwise, the pump works all the time; if t2＜5s，VAConAnd setting according to the rule.
Preferably, said step (5) is carried out if t25s and pressure drop value delta > 0.02P, restart count after the whole car restarts continuously three times and detect the same result, then the instrument prompts alarm information: the vacuum is insufficient and leaks, the vehicle speed V is limited to be less than or equal to 40km/h, VACON is set to be the larger one of (VAC-0.05P) and 0.2P, and otherwise, the pump works all the time.
Preferably, said step (7) is carried out if t4Less than or equal to 12s and reaches a closing threshold value of 0.7P, the vacuum pump stops workingVacuum value VAC during depression of brake pedal1If the pressure is less than 0.45P, the vacuum pump is started to work; if t4> 12s and vacuum value VAC1If the pressure is more than or equal to 0.45P, the vacuum pump stops working, and the vacuum value VAC is in the period of stepping down the brake pedal1If the pressure is less than 0.4P, the vacuum pump is started to work; if t4> 60s, the meter displays: the vacuum pump continues to operate for an excessively long time.
Preferably, the step (7) releases the brake pedal during the operation of the vacuum pump, and normal operation is maintained; and (4) releasing the brake pedal during the operation of the vacuum pump, and turning to the step (1).
The invention has the beneficial effects that: based on a single differential pressure sensor and according to a specific logic control method, the vacuum pump is ensured to normally extract the required vacuum degree in plain and plateau environments, the production cost is reduced, and the popularization of new energy automobiles is facilitated.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments.
Example (b): the control method for the vacuum pump of the new energy vehicle adapting to the plateau comprises the following steps:
(1) when the brake pedal is released and the vacuum pump is in an operating state, a timer t1 is started and a vacuum value VAC at the start is recorded1The sensor adopts a differential pressure sensor, and the output value is a difference value relative to the atmospheric pressure value.
(2) Vacuum value at the beginning VAC1Compared with 0.3P and classified, VAC if the timing is started1If the P is more than 0.3P, the type is A; VAC if starting timing1If the P is less than or equal to 0.3P, the B is the same.
(3) Controlling the vacuum pump to be opened and closed according to the classification and the working state of the vacuum pump and recording the vacuum value VAC when the vacuum pump stops2If the brake pedal is stepped down before the vacuum pump stops working, timing is cancelled, the step (6) is carried out, otherwise, the step is carried out according to the vacuum value VAC1And (5) judging to transfer to the step (4) or the step (5) according to the comparison result with the 0.3P. In the case of class A, i.e. starting timing VAC1If the pressure is more than 0.3P, the vacuum pump works for 13s and does not reach the closing threshold value of 0.7PStopping the operation and recording the vacuum value VAC when the pump stops2(ii) a In the case of class B, i.e. starting timing VAC1Not more than 0.3P, stopping the vacuum pump when the vacuum pump is fully operated for 15s and does not reach a closing threshold value of 0.7P, and recording a vacuum value VAC when the pump is stopped2. If the vacuum pump stops working, 0.3P is less than VAC2< 0.45P, then the meter prompts: low vacuum assistance. The prompt message lasts for 5s and is displayed at intervals of 30 min.
(4) Vacuum value VAC at the beginning if the brake pedal is not depressed1If greater than 0.3P, start timing t2And performing leakage judgment:
(a) if t2When the pressure drop value is less than or equal to 0.02P for 5s, VAConWhen V is less than or equal to 40km/h, the larger one of (VAC-0.25P) and 0.25P is set, namely VAConAt V>The value is set to be the larger one of (VAC-0.15P) and 0.25P at 40 km/h.
(b) If t25s and pressure drop value delta > 0.02P, restart count after the whole car restarts continuously three times and detect the same result, then the instrument prompts alarm information: vacuum leakage, and vehicle speed V is limited to be less than or equal to 40km/h, and VAC is adoptedonWhen V is less than or equal to 40km/h, the larger one of (VAC-0.1P) and 0.25P is set, namely VAConAt V>The value is set to be the larger one of (VAC-0.05P) and 0.25P at 40 km/h.
(c) If t2Depression of the brake pedal < 5s, VAConAccording to the rule of the case (a).
(5) If the brake pedal is released and the vacuum value VAC at the beginning is1Not more than 0.3P, start timing t3And performing leakage judgment:
(a) if t2And 5s and the pressure drop value delta is less than or equal to 0.02P, then the instrument prompts alarm information: the vacuum is insufficient, the vehicle speed V is limited to be less than or equal to 40km/h, VACON is set to be the larger one of (VAC-0.05P) and 0.2P, and otherwise, the pump works all the time.
(b) If t25s and pressure drop value delta > 0.02P, restart count after the whole car restarts continuously three times and detect the same result, then the instrument prompts alarm information: vacuum insufficiency and leakage, and the vehicle speed V is limited to be less than or equal to 40km/h, and VACON is set to be (VAC-0.05P) or 0.2POne larger, otherwise the pump is working all the time.
(c) If t2Depression of the brake pedal < 5s, VAConAccording to the rule of the case (a).
(6) When the brake pedal is depressed and the vacuum pump is in an operating state, a timer t4 is started, and a vacuum value VAC at the start is recorded1；
(7) And controlling the opening and closing of the vacuum pump according to the working state of the vacuum pump.
(a) If t4No more than 12s and reaching the closing threshold value of 0.7P, stopping the vacuum pump, and stepping on the brake pedal while maintaining the vacuum value VAC1If the pressure is less than 0.45P, the vacuum pump is started to work.
(b) If t4> 12s and vacuum value VAC1If the pressure is more than or equal to 0.45P, the vacuum pump stops working, and the vacuum value VAC is in the period of stepping down the brake pedal1If the pressure is less than 0.4P, the vacuum pump is started to work.
(c) If t4> 60s, the meter displays: the vacuum pump continues to operate for an excessively long time.
(8) If the brake pedal is released during the operation of the vacuum pump, the normal control logic is switched to, namely the vacuum pump is started at 0.45P, and the vacuum pump is stopped at 0.7P.
And (4) if the brake pedal is released during the operation of the vacuum pump, turning to the step (1).
Claims (8)
1. A control method of a vacuum pump of a new energy vehicle adapting to plateau is characterized by comprising the following steps:
(1) when the brake pedal is released and the vacuum pump is in an operating state, a timer t is started1And recording the vacuum value VAC at the beginning1；
(2) Vacuum value at the beginning VAC1Comparing with 0.3P and classifying;
(3) controlling the vacuum pump to be opened and closed according to the classification and the working state of the vacuum pump and recording the vacuum value VAC when the vacuum pump stops2If the brake pedal is stepped down before the vacuum pump stops working, timing is cancelled, the step (6) is carried out, otherwise, the step is carried out according to the vacuum value VAC1The judgment of the comparison result with 0.3P is transferred to the step (4) or the step(5)；
(4) Vacuum value VAC at the beginning if the brake pedal is not depressed1If greater than 0.3P, start timing t2And making a leak determination if t2When the pressure drop value is less than or equal to 0.02P for 5s, VAConWhen V is less than or equal to 40km/h, the larger one of (VAC-0.25P) and 0.25P is set, namely VAConAt V>Set to be the larger one of (VAC-0.15P) and 0.25P at 40 km/h; if t2Depression of the brake pedal < 5s, VAConSetting according to the rule; if t25s and pressure drop value delta > 0.02P, restart count after the whole car restarts continuously three times and detect the same result, then the instrument prompts alarm information: vacuum leakage, and vehicle speed V is limited to be less than or equal to 40km/h, and VAC is adoptedonWhen V is less than or equal to 40km/h, the larger one of (VAC-0.1P) and 0.25P is set, namely VAConAt V>Set to be the larger one of (VAC-0.05P) and 0.25P at 40 km/h;
(5) if the brake pedal is released and the vacuum value VAC at the beginning is1Not more than 0.3P, start timing t3And performing leakage judgment;
(6) when the brake pedal is depressed and the vacuum pump is in an operating state, a timer t is started4And recording the vacuum value VAC at the beginning1；
(7) And controlling the opening and closing of the vacuum pump according to the working state of the vacuum pump.
2. The control method for the vacuum pump of the new energy vehicle adapting to the plateau according to claim 1, wherein the classification manner of the step (2) is as follows: VAC if starting timing1If > 0.3P is A type, VAC if timing is started1P is less than or equal to 0.3 and is B.
3. The method for controlling the vacuum pump of the new energy vehicle adapted to the altitude as claimed in claim 2, wherein in the case of the type a in the step (3), the vacuum pump stops when the vacuum pump is fully operated for 13s and does not reach the closing threshold value of 0.7P, and the vacuum value VAC when the pump stops is recorded2(ii) a Stopping the vacuum pump when the vacuum pump is fully operated for 15s and does not reach the closing threshold value of 0.7P under the B-type condition, and recording the vacuum value VAC when the pump stops2。
4. The plateau-adapted new energy vehicle vacuum pump control method according to claim 3, wherein the step (3) is performed if 0.3P < VAC2< 0.45P, instrument prompt: low vacuum assistance.
5. The plateau-adapted new energy vehicle vacuum pump control method according to claim 1, wherein the step (5) is performed if t2And 5s and the pressure drop value delta is less than or equal to 0.02P, then the instrument prompts alarm information: the vacuum is insufficient, the vehicle speed V is limited to be less than or equal to 40km/h, VACON is set to be the larger one of (VAC-0.05P) and 0.2P, otherwise, the pump works all the time; if t2＜5s，VAConAnd setting according to the rule.
6. The plateau-adapted new energy vehicle vacuum pump control method according to claim 1, wherein the step (5) is performed if t25s and pressure drop value delta > 0.02P, restart count after the whole car restarts continuously three times and detect the same result, then the instrument prompts alarm information: the vacuum is insufficient and leaks, the vehicle speed V is limited to be less than or equal to 40km/h, VACON is set to be the larger one of (VAC-0.05P) and 0.2P, and otherwise, the pump works all the time.
7. The plateau-adapted new energy vehicle vacuum pump control method according to claim 1, wherein the step (7) is performed if t4No more than 12s and reaching the closing threshold value of 0.7P, stopping the vacuum pump, and stepping on the brake pedal while maintaining the vacuum value VAC1If the pressure is less than 0.45P, the vacuum pump is started to work; if t4> 12s and vacuum value VAC1If the pressure is more than or equal to 0.45P, the vacuum pump stops working, and the vacuum value VAC is in the period of stepping down the brake pedal1If the pressure is less than 0.4P, the vacuum pump is started to work; if t4> 60s, the meter displays: the vacuum pump continues to operate for an excessively long time.
8. The vacuum pump control method for the new energy vehicle adapted to the plateau as claimed in claim 1, wherein the step (7) releases a brake pedal during the stop of the vacuum pump to maintain normal operation; and (4) releasing the brake pedal during the operation of the vacuum pump, and turning to the step (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911071182.0A CN111301383B (en) | 2019-11-05 | 2019-11-05 | Plateau-adaptive new energy vehicle vacuum pump control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911071182.0A CN111301383B (en) | 2019-11-05 | 2019-11-05 | Plateau-adaptive new energy vehicle vacuum pump control method |
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| CN111301383A CN111301383A (en) | 2020-06-19 |
| CN111301383B true CN111301383B (en) | 2021-05-28 |
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| CN107662597B (en) * | 2017-08-10 | 2020-01-17 | 宝沃汽车（中国）有限公司 | Vacuum pump control method and device for vehicle and vehicle with vacuum pump control method and device |
| CN117302152A (en) * | 2019-04-03 | 2023-12-29 | 厦门金龙联合汽车工业有限公司 | Control diagnosis method for electric automobile service brake booster system |
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2019
- 2019-11-05 CN CN201911071182.0A patent/CN111301383B/en active Active
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| CN105636848A (en) * | 2013-10-21 | 2016-06-01 | 雷诺股份公司 | Management of the differential pressure thresholds of a vacuum pump connected to the braking system of a motor vehicle |
| DE102016120783A1 (en) * | 2015-11-20 | 2017-05-24 | Suzuki Motor Corporation | Method for controlling a vacuum pump for a motor vehicle |
| CN107458364A (en) * | 2017-07-20 | 2017-12-12 | 北京新能源汽车股份有限公司 | Force aid system for braking control method and device |
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| CN111301383A (en) | 2020-06-19 |
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