CN111791860B - Electric vacuum pump control method of electric manual transmission automobile - Google Patents
Electric vacuum pump control method of electric manual transmission automobile Download PDFInfo
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- CN111791860B CN111791860B CN202010628015.8A CN202010628015A CN111791860B CN 111791860 B CN111791860 B CN 111791860B CN 202010628015 A CN202010628015 A CN 202010628015A CN 111791860 B CN111791860 B CN 111791860B
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- vacuum pump
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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
- B60T13/24—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
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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
- B60T13/24—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
- B60T13/565—Vacuum systems indirect, i.e. vacuum booster units characterised by being associated with master cylinders, e.g. integrally formed
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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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/02—Arrangements of pumps or compressors, or control devices therefor
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Control Of Transmission Device (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a method for controlling an electric vacuum pump of an electric manual transmission automobile, which comprises the following steps of S1: acquiring vehicle information; s2: calculating the starting threshold value P of the vacuum pump according to the vehicle informationonAnd vacuum pump shut-off threshold Poff(ii) a S3: according to the vehicle information and the vacuum pump starting threshold value PonAnd vacuum pump shut-off threshold PoffAnd controlling the opening and closing of the vacuum pump. The method comprises the steps of firstly calculating an uncorrected vacuum pump opening and closing coefficient threshold value according to vehicle speed information, then calculating a correction coefficient threshold value for opening and closing the vacuum pump according to a gear signal, then calculating a vacuum pump opening and closing threshold value according to a maximum relative vacuum pressure value of the vacuum pump, and finally comparing the current vacuum degree of a vacuum tank with the calculated vacuum pump opening and closing threshold value according to the on-off state of a relay to confirm the opening or closing of the vacuum pump. The automobile is suitable for automobiles.
Description
Technical Field
The invention relates to the technical field of automobile vacuum pump control, in particular to a method for controlling an electric vacuum pump of an electric manual transmission automobile.
Background
After an electric vacuum pump is adopted by an electric manual gear automobile (such as an electric manual gear instruction car), the vacuum degree of a system can be controlled by accurately controlling the opening and closing of the pump. If the vacuum degree control target is high, braking is facilitated, but energy conservation is not facilitated, and the service life of the pump is shortened due to frequent work of the vacuum pump; if the vacuum level control target is low, there may be insufficient brake assist, thereby affecting vehicle driving safety.
At present, the published relevant documents mainly consider the external environment air pressure and the vehicle speed, and set different vacuum control targets according to the information, so as to balance the energy conservation, the service life of the vacuum pump and the braking performance. Unnecessary energy consumption is reduced as much as possible, and the vehicle driving mileage is improved, which is one of the research and optimization directions of the whole vehicle. When the manual gear automobile is in a low gear, the friction force of the motor after an accelerator is loosened and the resistance generated by the negative torque generated by energy recovery are also large, so that the braking is greatly assisted, therefore, the vacuum degree control target can be properly reduced when the low gear is adopted, the energy consumption is also properly reduced when the braking safety is not influenced, and particularly for the electric instruction car, the energy-saving effect can be improved under the long-term low-gear driving working condition in the examination training of subject two and subject three.
Disclosure of Invention
The present invention is directed to a method for controlling an electric vacuum pump of an electric manual transmission vehicle, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a control method of an electric vacuum pump of an electric manual transmission automobile comprises the following steps,
s1: acquiring vehicle information;
s2: calculating a vacuum pump starting threshold value P according to the vehicle informationonAnd vacuum pump shut-off threshold Poff；
S3: according to vehicle information and the vacuum pump starting threshold value PonAnd vacuum pump shut-off threshold PoffAnd controlling the opening and closing of the vacuum pump.
Preferably, the obtaining of the vehicle information, specifically,
acquiring clutch stroke information, vehicle speed information and gear information of a vehicle and vacuum degree P of a vacuum tankmeAnd the on-off state of the relay.
Preferably, the vacuum pump starting threshold value P is calculated according to the vehicle informationonAnd vacuum pump shut-off threshold PoffSpecifically, the method comprises the following steps of,
s21: calculating an uncorrected vacuum pump opening coefficient threshold value R according to the vehicle speed informationon_rawAnd an uncorrected vacuum pump shutdown coefficient threshold Roff_raw；
S22: calculating a correction coefficient threshold value delta R for starting and closing the vacuum pump according to the clutch stroke information, the vehicle speed information and the gear information;
s23: calculating the corrected threshold value R of the opening coefficient of the vacuum pumponAnd a corrected vacuum pump shutdown coefficient threshold Roff；
S24: according to the maximum relative vacuum pressure value P provided by the vacuum pumplimitCalculating the vacuum pump opening threshold PonAnd vacuum pump shut-off threshold Poff。
Preferably, the uncorrected vacuum pump opening coefficient threshold value R is calculated according to the vehicle speed informationon_rawAnd an uncorrected vacuum pump shutdown coefficient threshold Roff_rawSpecifically, the method comprises the following steps of,
according to the vehicle speed information, looking up a table through an interpolation method to obtain an uncorrected vacuum pump opening coefficient threshold value Ron_rawAnd an uncorrected vacuum pump shutdown coefficient threshold Roff_raw。
Preferably, the vacuum pump on/off correction coefficient threshold value Δ R is calculated according to the clutch stroke information, the vehicle speed information and the gear information, specifically,
according to the clutch stroke information, the vehicle speed information and the gear information, when the clutch stroke r is inclutchWhen the speed is less than 10% of the whole stroke, obtaining a correction coefficient threshold value delta R for starting and closing the vacuum pump through a table look-up of the correction coefficient threshold value, the gear and the vehicle speed, and when the speed is less than the whole stroke R of the clutchclutchWhen the stroke is 10% or more of the entire stroke, Δ R is 0.
Preferably, the calculating of the corrected threshold value R of the vacuum pump opening coefficientonAnd a corrected vacuum pump shutdown coefficient threshold RoffThe calculation formula is concretely as follows,
Ron＝Ron_raw-ΔR；
Roff＝Roff_raw-ΔR。
preferably, the maximum relative vacuum pressure value P provided by the vacuum pumplimitCalculating the vacuum pump opening threshold PonAnd vacuum pump shut-off threshold PoffThe calculation formula is concretely as follows,
Pon＝Ron*Plimit；
Poff＝Roff*Plimit。
preferably, the information is based on vehicle information andthe starting threshold value P of the vacuum pumponAnd vacuum pump shut-off threshold PoffControlling the opening and closing of the vacuum pump, specifically,
according to the vacuum degree P of the vacuum tankmeAnd the on-off state of the relay, and the vacuum pump opening threshold value PonAnd vacuum pump shut-off threshold PoffAnd controlling the opening and closing of the vacuum pump.
Preferably, the vacuum degree P according to the vacuum tankmeAnd the on-off state of the relay, and the vacuum pump opening threshold value PonAnd vacuum pump shut-off threshold PoffControlling the opening and closing of the vacuum pump, specifically,
if the relay is in the on state, according to the acquired vacuum degree PmeAnd the vacuum pump shut-off threshold PoffWhether to close the valve is determined according to the comparison result, when the vacuum degree P is reachedmeGreater than or equal to the vacuum pump shut-off threshold PoffWhen the vacuum pump is started, the vacuum pump is determined to be closed; if the relay is in an off state, according to the acquired vacuum degree PmeAnd the vacuum pump opening threshold value PonWhether the vacuum degree P is on or off is determined according to the comparison resultmeLess than the vacuum pump opening threshold PonWhen the vacuum pump is started, the vacuum pump is determined to be started.
Compared with the prior art, the invention has the beneficial effects that: the control method of the electric vacuum pump of the electric manual transmission automobile;
the method comprises the steps of firstly calculating an uncorrected vacuum pump opening and closing coefficient threshold value according to vehicle speed information, then calculating a correction coefficient threshold value for opening and closing the vacuum pump according to a clutch stroke signal and a gear signal, then calculating a vacuum pump opening and closing threshold value according to a maximum relative vacuum pressure value of the vacuum pump, and finally comparing the current vacuum degree of a vacuum tank with the calculated vacuum pump opening and closing threshold value according to the on-off state of a relay to confirm the opening or closing of the vacuum pump.
Drawings
FIG. 1 is a functional block diagram of the present invention;
fig. 2 is a system configuration diagram for controlling an electric vacuum pump according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a control method of an electric vacuum pump of an electric manual transmission automobile comprises the following steps,
s1: acquiring the speed information and gear information of the vehicle and the vacuum degree P of the vacuum tankmeAnd the on-off state of the relay;
s21: calculating an uncorrected vacuum pump opening coefficient threshold value R according to the vehicle speed informationon_rawAnd an uncorrected vacuum pump shutdown coefficient threshold Roff_raw；
S22: calculating a correction coefficient threshold value delta R for starting and closing the vacuum pump according to the clutch stroke information, the vehicle speed information and the gear information;
s23: calculating the corrected threshold value R of the opening coefficient of the vacuum pumponAnd a corrected vacuum pump shutdown coefficient threshold Roff；
S24: according to the maximum relative vacuum pressure value P of the vacuum pumplimitCalculating the vacuum pump opening threshold PonAnd vacuum pump shut-off threshold Poff；
S3: according to the vacuum degree P of the vacuum tankmeAnd the on-off state of the relay, and the vacuum pump opening threshold value PonAnd vacuum pump shut-off threshold PoffAnd controlling the opening and closing of the vacuum pump.
Calculating an uncorrected vacuum pump opening coefficient threshold value R according to the vehicle speed informationon_rawAnd unmodifiedVacuum pump shutdown coefficient threshold Roff_rawThe method specifically comprises the following steps: according to the vehicle speed information, obtaining an uncorrected vacuum pump opening coefficient threshold value R by looking up a table (see table I) through an interpolation methodon_rawAnd an uncorrected vacuum pump shutdown coefficient threshold Roff_raw。
TABLE I relationship table of uncorrected vacuum pump shut-off and turn-on coefficient thresholds versus vehicle speed
| Vehicle speed (Km/h) | Closing threshold | Turn on threshold |
| 0 | 0.60 | 0.40 |
| 5 | 0.55 | 0.40 |
| 10 | 0.50 | 0.30 |
| 20 | 0.55 | 0.35 |
| 30 | 0.60 | 0.40 |
| 40 | 0.65 | 0.45 |
| 50 | 0.70 | 0.50 |
The calculating of the correction coefficient threshold value delta R for the opening and closing of the vacuum pump according to the clutch stroke information, the vehicle speed information and the gear information specifically comprises the following steps: according to the clutch stroke information, the vehicle speed information and the gear information, when the clutch stroke r is inclutchWhen the speed is less than 10% of the whole stroke, obtaining the correction coefficient threshold value delta R for starting and closing the vacuum pump through a table look-up (see table II) of the correction coefficient threshold value, the gear and the vehicle speed, and when the speed is less than the whole stroke R of the clutchclutchWhen the stroke is 10% or more of the entire stroke, Δ R is 0.
Second, look-up table for correction coefficient threshold, gear and vehicle speed
The corrected threshold value R of the starting coefficient of the vacuum pump is calculatedonAnd a corrected vacuum pump shutdown coefficient threshold RoffThe calculation formula is specifically as follows:
Ron＝Ron_raw-ΔR；
Roff＝Roff_raw-ΔR。
the maximum relative vacuum pressure value P provided by the vacuum pumplimitCalculating the vacuum pump opening threshold PonAnd vacuum pump shut-off threshold PoffThe calculation formula is specifically as follows:
Pon＝Ron*Plimit；
Poff＝Roff*Plimit。
according to the vacuum degree P of the vacuum tankmeAnd the on-off state of the relay, and the vacuum pump opening threshold value PonAnd vacuum pump shut-off threshold PoffControlling the opening and closing of the vacuum pump, which specifically comprises the following steps: if the relay is in the on state, according to the acquired vacuum degree PmeAnd the vacuum pump shut-off threshold PoffWhether to close the valve is determined according to the comparison result, when the vacuum degree P is reachedmeGreater than or equal to the vacuum pump shut-off threshold PoffWhen the vacuum pump is started, the vacuum pump is determined to be closed; if the relay is in an off state, according to the acquired vacuum degree PmeAnd the vacuum pump opening threshold value PonWhether the vacuum degree P is on or off is determined according to the comparison resultmeLess than the vacuum pump opening threshold PonWhen the vacuum pump is started, the vacuum pump is determined to be started.
The system for controlling the electric vacuum pump in this embodiment is configured as shown in fig. 2, and the vacuum pump control module is responsible for calculating the enabling of the opening and closing of the vacuum pump according to the vacuum degree information, the vehicle speed and the gear information. And the vacuum pump relay is used for starting or closing the vacuum pump after starting or closing enabling is carried out, and feeding back the closing and connecting states. The vacuum tank and the vacuum sensor assembly are connected with a vacuum pump through a pipeline, vacuum is stored, and vacuum degree information is fed back to the vacuum pump control module.
According to the method, firstly, the uncorrected opening and closing coefficient threshold value of the vacuum pump is calculated according to the vehicle speed information, then the correction coefficient threshold value of the opening and closing of the vacuum pump is calculated according to the gear signal, then the opening and closing threshold value of the vacuum pump is calculated according to the maximum relative vacuum pressure value of the vacuum pump, finally the vacuum degree of the current vacuum tank and the calculated opening and closing threshold value of the vacuum pump are compared according to the on-off state of the relay, and the opening or closing of the vacuum pump is confirmed, so that the requirement of braking on the vacuum degree is reasonably considered according to the difference of the current vehicle speed and the gear of a vehicle, the energy-.
Those not described in detail in this specification are within the skill of the art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The control method of the electric vacuum pump of the electric manual transmission automobile is characterized by comprising the following steps of: comprises the following steps of (a) carrying out,
s1: acquiring vehicle information;
s2: calculating a vacuum pump starting threshold value P according to the vehicle informationonAnd vacuum pump shut-off threshold Poff；
S3: according to vehicle information and the vacuum pump starting threshold value PonAnd vacuum pump shut-off threshold PoffControlling the opening and closing of the vacuum pump;
the acquisition of the vehicle information, specifically,
acquiring clutch stroke information, vehicle speed information and gear information of a vehicle and vacuum degree P of a vacuum tankmeAnd the on-off state of the relay;
calculating a vacuum pump starting threshold value P according to the vehicle informationonAnd vacuum pump shut-off threshold PoffSpecifically, the method comprises the following steps of,
s21: calculating an uncorrected vacuum pump opening coefficient threshold value R according to the vehicle speed informationon_rawAnd an uncorrected vacuum pump shutdown coefficient threshold Roff_raw；
S22: calculating a correction coefficient threshold value delta R for starting and closing the vacuum pump according to the clutch stroke information, the vehicle speed information and the gear information;
s23: calculating the corrected threshold value R of the opening coefficient of the vacuum pumponAnd a corrected vacuum pump shutdown coefficient threshold Roff；
S24: according to the maximum relative vacuum pressure value P provided by the vacuum pumplimitCalculating the vacuum pump opening threshold PonAnd vacuum pump shut-off threshold Poff。
2. The method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 1, wherein: calculating an uncorrected vacuum pump opening coefficient threshold value R according to the vehicle speed informationon_rawAnd an uncorrected vacuum pump shutdown coefficient threshold Roff_rawSpecifically, the method comprises the following steps of,
according to the vehicle speed information, looking up a table through an interpolation method to obtain an uncorrected vacuum pump opening coefficient threshold value Ron_rawAnd an uncorrected vacuum pump shutdown coefficient threshold Roff_raw。
3. The method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 2, characterized in that: calculating a correction coefficient threshold value delta R for starting and closing the vacuum pump according to the clutch stroke information, the vehicle speed information and the gear information, specifically,
according to the clutch stroke information, the vehicle speed information and the gear information, when the clutch stroke r is inclutchWhen the speed is less than 10% of the whole stroke, obtaining a correction coefficient threshold value delta R for starting and closing the vacuum pump through a table look-up of the correction coefficient threshold value, the gear and the vehicle speed, and when the speed is less than the whole stroke R of the clutchclutchWhen the stroke is 10% or more of the entire stroke, Δ R is 0.
4. The method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 3, characterized in that: calculating the corrected threshold value R of the opening coefficient of the vacuum pumponAnd a corrected vacuum pump shutdown coefficient threshold RoffThe calculation formula is concretely as follows,
Ron＝Ron_raw-ΔR；
Roff＝Roff_raw-ΔR。
5. the method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 4, wherein: the maximum relative vacuum pressure value P provided by the vacuum pumplimitMeter for measuringCalculating vacuum pump opening threshold value PonAnd vacuum pump shut-off threshold PoffThe calculation formula is concretely as follows,
Pon＝Ron*Plimit；
Poff＝Roff*Plimit。
6. the method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 1, wherein: the starting threshold value P of the vacuum pump according to the vehicle informationonAnd vacuum pump shut-off threshold PoffControlling the opening and closing of the vacuum pump, specifically,
according to the vacuum degree P of the vacuum tank of the vehiclemeAnd the on-off state of the relay, and the vacuum pump opening threshold value PonAnd vacuum pump shut-off threshold PoffAnd controlling the opening and closing of the vacuum pump.
7. The method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 6, wherein: according to the vacuum degree P of the vacuum tankmeAnd the on-off state of the relay, and the vacuum pump opening threshold value PonAnd vacuum pump shut-off threshold PoffControlling the opening and closing of the vacuum pump, specifically,
if the relay is in the on state, according to the acquired vacuum degree PmeAnd the vacuum pump shut-off threshold PoffWhether to close the valve is determined according to the comparison result, when the vacuum degree P is reachedmeGreater than or equal to the vacuum pump shut-off threshold PoffWhen the vacuum pump is started, the vacuum pump is determined to be closed; if the relay is in an off state, according to the acquired vacuum degree PmeAnd the vacuum pump opening threshold value PonWhether the vacuum degree P is on or off is determined according to the comparison resultmeLess than the vacuum pump opening threshold PonWhen the vacuum pump is started, the vacuum pump is determined to be started.
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| CN202010628015.8A CN111791860B (en) | 2020-07-01 | 2020-07-01 | Electric vacuum pump control method of electric manual transmission automobile |
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| CN202010628015.8A CN111791860B (en) | 2020-07-01 | 2020-07-01 | Electric vacuum pump control method of electric manual transmission automobile |
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| CN111791860B true CN111791860B (en) | 2021-08-13 |
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Citations (6)
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|---|---|---|---|---|
| GB2492404A (en) * | 2011-07-01 | 2013-01-02 | Land Rover Uk Ltd | Ambient pressure dependent electric vacuum pump control for brake booster |
| CN103496363A (en) * | 2013-09-24 | 2014-01-08 | 三门峡速达交通节能科技股份有限公司 | Energy-saving braking system and method and electric automobile |
| CN204641736U (en) * | 2015-05-18 | 2015-09-16 | 安徽江淮汽车股份有限公司 | A kind of vehicle oil saving system |
| JP6004749B2 (en) * | 2012-04-23 | 2016-10-12 | ダイハツ工業株式会社 | Electric negative pressure pump controller |
| CN104842988B (en) * | 2014-05-23 | 2018-01-19 | 北汽福田汽车股份有限公司 | A kind of brake vacuum pump opens threshold value and closes the control method and system of threshold value |
| CN111301381A (en) * | 2019-11-19 | 2020-06-19 | 浙江零跑科技有限公司 | Plateau control method for electric vacuum pump for new energy vehicle |
-
2020
- 2020-07-01 CN CN202010628015.8A patent/CN111791860B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2492404A (en) * | 2011-07-01 | 2013-01-02 | Land Rover Uk Ltd | Ambient pressure dependent electric vacuum pump control for brake booster |
| JP6004749B2 (en) * | 2012-04-23 | 2016-10-12 | ダイハツ工業株式会社 | Electric negative pressure pump controller |
| CN103496363A (en) * | 2013-09-24 | 2014-01-08 | 三门峡速达交通节能科技股份有限公司 | Energy-saving braking system and method and electric automobile |
| CN104842988B (en) * | 2014-05-23 | 2018-01-19 | 北汽福田汽车股份有限公司 | A kind of brake vacuum pump opens threshold value and closes the control method and system of threshold value |
| CN204641736U (en) * | 2015-05-18 | 2015-09-16 | 安徽江淮汽车股份有限公司 | A kind of vehicle oil saving system |
| CN111301381A (en) * | 2019-11-19 | 2020-06-19 | 浙江零跑科技有限公司 | Plateau control method for electric vacuum pump for new energy vehicle |
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