Electric vacuum pump control method of electric manual transmission automobile
阅读说明：本技术 一种电动手动挡汽车的电动真空泵控制方法 (Electric vacuum pump control method of electric manual transmission automobile ) 是由 王建波 于 2020-07-01 设计创作，主要内容包括：本发明公开了一种电动手动挡汽车的电动真空泵控制方法,包括以下步骤,S1：获取车辆信息；S2：根据车辆信息计算真空泵开启阈值P<Sub>on</Sub>和真空泵关闭阈值P<Sub>off</Sub>；S3：根据车辆信息以及真空泵开启阈值P<Sub>on</Sub>和真空泵关闭阈值P<Sub>off</Sub>,控制真空泵的开启和关闭。先根据车速信息计算未修正的真空泵开启和关闭系数阈值,然后根据档位信号计算真空泵开启和关闭的修正系数阈值,再根据真空泵的最大相对真空压力值计算真空泵开启和关闭阈值,最后根据继电器的通断状态比较当前真空罐的真空度与计算的真空泵开启和关闭阈值,确认开启或关闭真空泵,这样根据车辆当前车速和档位的不同,合理地考虑了制动对真空度的需求,同时提高了节能效果,提升了真空泵使用寿命。适用于汽车。(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 information on And vacuum pump shut-off threshold P off (ii) a S3: according to the vehicle information and the vacuum pump starting threshold value P on And vacuum pump shut-off threshold P off And controlling the opening and closing of the vacuum pump. 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, finally comparing the current vacuum degree of the vacuum tank with the calculated vacuum pump opening and closing threshold value according to the on-off state of a relay, and confirming the opening or closingThe vacuum pump reasonably considers the requirement of braking on the vacuum degree according to the difference of the current speed and the gear of the vehicle, improves the energy-saving effect and prolongs the service life of the vacuum pump. The automobile is suitable for automobiles.)
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 PoffAnd controlling the opening and closing of the vacuum pump.
2. The method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 1, wherein: the acquisition of the vehicle information, specifically,
obtaining clutch behavior of a vehicleTravel information, vehicle speed information, shift information, and vacuum degree P of vacuum tankmeAnd the on-off state of the relay.
3. The method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 2, characterized in that: 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。
4. The method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 3, characterized in that: 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。
5. The method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 4, wherein: 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.
6. The method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 5, wherein: 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。
7. the method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 6, wherein: 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。
8. 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.
9. The method for controlling the electric vacuum pump of the electric-manual transmission automobile according to claim 8, 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.
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 clutchclutchGreater than or equal to the whole strokeAt 10%, 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 vehicle-based information and the vacuum pump start threshold PonAnd 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 resultmeIs less than trueThreshold value P for starting empty pumponWhen 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 an uncorrected vacuum 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.