CN104828050A - Vehicle electronic vacuum pump control method and vehicle-mounted electronic control unit for implementing method - Google Patents
Vehicle electronic vacuum pump control method and vehicle-mounted electronic control unit for implementing method Download PDFInfo
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- CN104828050A CN104828050A CN201410049038.8A CN201410049038A CN104828050A CN 104828050 A CN104828050 A CN 104828050A CN 201410049038 A CN201410049038 A CN 201410049038A CN 104828050 A CN104828050 A CN 104828050A
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- threshold value
- sea level
- level elevation
- vacuum pump
- electronic vacuum
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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
- B60T13/10—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
-
- 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
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The invention relates to the braking technology, in particular to a vehicle electronic vacuum pump control method and a vehicle-mounted electronic control unit for implementing the method. According to one embodiment of the invention, the vehicle electronic vacuum pump control method comprises the following steps: obtaining a vacuum level in a vacuum booster; comparing the vacuum level with a control threshold to determine the open-close state of an electronic vacuum pump; and causing the electronic vacuum pump to be in an opened or closed state according to the comparison result, wherein the control threshold is dynamically adjusted according to the current elevation of a vehicle, and the higher the elevation is, the smaller the control threshold is.
Description
Technical field
The present invention relates to braking technology, particularly auto electronic vacuum pump control method and realize the controlled vehicle-mounted electrical unit of the method.
Background technology
The mode of controlled vehicle-mounted electrical unit controls electronic vacuum pump generally comprises open loop mode and closed loop mode.Under front a kind of pattern, controlled vehicle-mounted electrical unit does not rely on the vacuum levels in vacuum booster for the keying of electronic vacuum pump.This pattern has and realizes simple advantage, but control accuracy is poor.Under closed loop mode, controlled vehicle-mounted electrical unit is according to the open/close states of the measurement signal determination electronic vacuum pump of vacuum sensor.Specifically, the vacuum levels signal recorded and control threshold value compare by controlled vehicle-mounted electrical unit, and determine the open/close states of electronic vacuum pump according to comparative result.But in this mode, control accuracy is very responsive for the setting controlling threshold value, sets too high if control threshold value, then vacuum pump can be caused to open too early and spend evening and close, sometimes also cause vacuum pump often to turn, thus cause the electronic vacuum pump life-span obviously to shorten even burning; On the other hand, set lower if control threshold value, although then the loss of electronic vacuum pump can be slowed down, electronic vacuum pump may be caused to open evening and closed too early, even cause electronic vacuum pump to open, thus loss deceleration and stopping performance.
Therefore, in the urgent need to a kind of control method of auto electronic vacuum pump, it can avoid the various problems caused because of the high sensitivity to control set threshold value.
Summary of the invention
An object of the present invention is to provide a kind of control method of auto electronic vacuum pump, it while guaranteeing deceleration and stopping performance, can extend the service life of electronic vacuum pump.
Comprise the following steps: according to the control method of the auto electronic vacuum pump of one embodiment of the invention
Obtain the vacuum levels in vacuum booster;
Described vacuum levels and control threshold value are compared the open/close states determined residing for electronic vacuum pump; And
Described electronic vacuum pump is made to be in unlatching or closed condition according to the result compared,
Wherein, carry out dynamic conditioning according to the current residing sea level elevation of vehicle to described control threshold value, wherein, when described sea level elevation is higher, described control threshold value is less.
Preferably, in the control method of above-mentioned auto electronic vacuum pump, utilize the current residing sea level elevation of the measurement signal determination vehicle of ambient atmosphere pressure sensor.
Preferably, in the control method of above-mentioned auto electronic vacuum pump, described control threshold value comprises opens threshold value and closes threshold value, and described unlatching threshold value is less than described closedown threshold value and determines the open/close states residing for described electronic vacuum pump according to following condition:
If described vacuum levels is less than or equal to described unlatching threshold value, then open described electronic vacuum pump;
If described vacuum levels is greater than described closedown threshold value, then close described electronic vacuum pump;
If but described vacuum levels is greater than described unlatching threshold value is less than or equal to described closedown threshold value, then make the state that described electronic vacuum pump keeps original.
Better, in the control method of above-mentioned auto electronic vacuum pump, between zero sea level elevation and the first sea level elevation, described unlatching threshold value and closedown threshold value are steady state value, between the first sea level elevation and the second sea level elevation, described unlatching threshold value and closedown threshold value linearly reduce with the rising of sea level elevation, and between the second sea level elevation and the 3rd sea level elevation, described unlatching threshold value is steady state value and described closedown threshold value linearly reduces with the rising of sea level elevation.
Better, in the control method of above-mentioned auto electronic vacuum pump, within the scope of whole sea level elevation, it is the preset value of positive number that described closedown threshold value is greater than a value with the difference of opening threshold value.
Of the present invention also have an object to be to provide a kind of controlled vehicle-mounted electrical unit, and it while guaranteeing deceleration and stopping performance, can extend the service life of electronic vacuum pump.
According to the control unit that the controlled vehicle-mounted electrical unit of one embodiment of the invention comprises input block, output unit and is coupled with described input block and output unit, wherein, described input block is configured to receive measurement signal from sensor, described control unit is configured to generate control command according to described measurement signal, described output unit is configured to export described control command to actuating unit, wherein, described control unit is further configured to and generates described control command according to following manner:
Vacuum levels in the vacuum booster recorded by sensor and control threshold value compare the open/close states determined residing for electronic vacuum pump; And
The control command making described electronic vacuum pump be in unlatching or closed condition is generated according to the result compared,
Wherein, described control unit is configured to carry out dynamic conditioning according to the current residing sea level elevation of vehicle to described control threshold value, and wherein when described sea level elevation is higher, described control threshold value is less.
The above embodiment of the present invention has following advantages:
(1) by the adjusting and optimizing to control logic and controling parameters, enable the automatic performance of vehicle adapt to the area of different altitude height well, the vehicle target market large at height above sea level drop has a wide range of applications.
(2) utilize succinct control logic to reach outstanding control effects, and reduce energy consumption and noise, meanwhile extend again the service life of electronic vacuum pump.
Accompanying drawing explanation
From following detailed description by reference to the accompanying drawings, above and other objects of the present invention and advantage will be made more completely clear.
Fig. 1 is the schematic diagram of the controlled vehicle-mounted electrical unit according to one embodiment of the invention.
Fig. 2 is the diagram of circuit of the control method of auto electronic vacuum pump according to one embodiment of the invention.
Fig. 3 is the schematic diagram of the control threshold value setting means for Fig. 1 and 2 illustrated embodiment, and wherein, transverse axis is the current residing sea level elevation of vehicle, and the longitudinal axis is for controlling threshold value.
Fig. 4 be embodiment illustrated in fig. 2 in control command generate the diagram of circuit of subprogram.
Detailed description of the invention
More all sidedly the present invention is described referring to the accompanying drawing which illustrates illustrative examples of the present invention.But the present invention can realize by multi-form, and should not be read as each embodiment being only limitted to provide herein.The various embodiments described above provided are intended to make disclosure herein comprehensively complete, thus make the understanding of scope more comprehensive and accurate.
Such as " comprise " and the term of " comprising " and so on represents except having the unit and step that have in the specification and in the claims directly and clearly state, technical scheme of the present invention does not get rid of the situation had not by other unit of directly or clearly stating and step yet.
The such as term of " first " and " second " and so on does not represent the order of unit in time, space, size etc. and is only be used as to distinguish each unit.
Embodiments of the invention are specifically described below by accompanying drawing.
Fig. 1 is the schematic diagram of the controlled vehicle-mounted electrical unit according to one embodiment of the invention.
As shown in Figure 1, controlled vehicle-mounted electrical unit 10 comprises input block 110, output unit 120 and control unit 130.
Input block 110 receives measurement signal from the various sensors vehicle and is supplied to control unit 130.Sensor such as includes but not limited to vacuum sensor 21 and ambient atmosphere pressure sensor 22, is respectively used to the ambient atmosphere voltage levels of vacuum levels in measurement of vacuum servo-unit and the current present position of vehicle.Control unit 130 is coupled with input block 110 and output unit 120, and its measurement signal provided according to input block 110 generates control command and exports actuating unit to through output unit 120, realizes the control of electronic control unit to vehicle running state thus.
See Fig. 1, control unit 130 comprises I/O interface 131, central process unit 132 and memory device 133.The measurement signal that input block 110 receives can deliver to central process unit 132 and memory device 133 through I/O interface 131.On the other hand, the control command that central process unit 132 generates also can be sent to output unit 120 through I/O interface.Memory device 133 stores the program needed for vehicle running state of control and data.
In the present embodiment, control unit 130 is according to the current residing sea level elevation of the measurement signal determination vehicle of the ambient atmosphere pressure received from ambient atmosphere pressure sensor 22 through input block 110, and and then determine according to sea level elevation the control threshold value controlling electronic vacuum pump open/close states, its mode, for making when sea level elevation is higher, controls threshold value less.Control threshold value comprise unlatching threshold value and close threshold value, wherein, open threshold value and be less than closedown threshold value.
Subsequently, control unit 130 is by the vacuum levels measurement signal received from vacuum sensor 21 through input block 110 and the open/close states controlling threshold value and compare to determine residing for electronic vacuum pump.Preferably, control unit 130 adopts following condition to determine open/close states:
(1) if vacuum levels is less than or equal to unlatching threshold value, then unlocking electronic vacuum pump;
(2) if vacuum levels is greater than closedown threshold value, then electronic vacuum pump is closed;
(3) open threshold value if vacuum levels is greater than but is less than or equal to closedown threshold value, then making electronic vacuum pump keep original state constant.
After control unit 130 generates control command, this control command is output to control relay 30 to drive electronic vacuum pump 40 through output unit 120.
In the present embodiment, preferably, control unit 130 can adopt the sea level elevation shown in Fig. 3-control threshold value relation to determine to control threshold value.See Fig. 3, whole sea level elevation scope (such as 0-4500 rice) is divided into some sections, wherein, between zero sea level elevation and the first sea level elevation A, open in threshold value TH1(figure shown in broken lines) and closedown threshold value TH2(figure in illustrate with solid line) be steady state value; Between the first sea level elevation A and the second sea level elevation B, open threshold value TH1 and linearly reduce with the rising of sea level elevation with closedown threshold value TH2; Between the second sea level elevation B and the 3rd sea level elevation C, opening threshold value is that steady state value is closed threshold value and linearly reduced with the rising of sea level elevation.
In above-mentioned control threshold value setting means, make unlatching threshold value TH1 and close threshold value TH2 between zero sea level elevation and sea level elevation A, keep higher steady state value to ensure vehicle has preferably deceleration and stopping performance and pedal sense when comparatively low altitude area, again reduce control difficulty simultaneously.In addition, open threshold value TH1 at the chien shih of the first sea level elevation A and the second sea level elevation B and close threshold value TH2 and linearly reduce to reduce the unnecessary time of run of electronic vacuum pump and number of times with the rising of sea level elevation, and special needs to be pointed out is, linear reduction mode not only effectively can reduce the complexity of control, but also reduces the dependence of control effects to sea level elevation A setting value.Finally, after sea level elevation is greater than B, makes unlatching threshold value keep constant can ensures the deceleration and stopping performance that vehicle is basic, because electronic vacuum pump will be caused to open evening when opening threshold value and being too small, namely just can open under extremely low degree of vacuum, thus have influence on traffic safety.
In the present embodiment, preferably, within the scope of whole sea level elevation, guaranteeing that the difference of closing threshold value TH2 and opening threshold value TH1 is greater than a value is the preset value of positive number.For this reason, the slope can closed in the interval of threshold value between the second sea level elevation B and the 3rd sea level elevation C by adjustment is realized, or can be that above-mentioned preset value realizes by the difference of the minimum value (also namely in the unlatching threshold value at the 3rd sea level elevation C place) making the minimum value of closedown threshold value (also namely in the closedown threshold value at the 3rd sea level elevation C place) and unlatching threshold value.
Fig. 2 is the diagram of circuit of the auto electronic vacuum pump control method according to one embodiment of the invention.Exemplarily, hypothesis adopts the controlled vehicle-mounted electrical unit shown in Fig. 1 to realize here, but will recognize that from the following description, and the method for the present embodiment does not also rely on the controlled vehicle-mounted electrical unit of ad hoc structure.
As shown in Figure 2, in step s 201, control unit 130 receives vacuum levels measurement signal and ambient atmosphere pressure measurement signal from vacuum sensor 21 and ambient atmosphere pressure sensor 22 respectively through input block 110.
Then enter step S202, ambient atmosphere pressure measurement signal is scaled the current residing sea level elevation of vehicle by control unit 130.
Enter step S203 subsequently, control unit 130 converts according to step S202 the control threshold value of the sea level elevation setup control electronic vacuum pump open/close states obtained, here control threshold value comprises opens threshold value and closes threshold value, and its concrete setting means is described in detail above, repeats no more herein.
Enter step S204 subsequently, control unit 130 performs control command and generates subprogram.In this subprogram, the control threshold value set in vacuum levels measurement signal and step S203 compares by control unit 130, and generates the control command about electronic vacuum pump open/close states according to comparative result.
Perform step S205 subsequently, control unit 130 exports to the relay 30 as actuating unit the control command generated through output unit 120, to make relay 30 drive electronic vacuum pump 40, thus realizes the keying of electronic vacuum pump.
Fig. 4 be embodiment illustrated in fig. 2 in control command generate the diagram of circuit of subprogram.
As shown in Figure 4, in step S401, vacuum levels measurement signal and unlatching threshold value TH1 compare by control unit 130, if vacuum levels measurement signal is less than or equal to unlatching threshold value, then enter step S402; Otherwise, then step S403 is entered.
In step S402, control unit 130 generates the control command of unlocking electronic vacuum pump and the step S205 entered in Fig. 2.
In step S403, vacuum levels measurement signal and closedown threshold value TH2 compare by control unit 130, if vacuum levels measurement signal is greater than closedown threshold value, then enter step S404; Otherwise, then step S405 is entered.
In step s 404, control unit 130 generates the control command and the step S205 entered in Fig. 2 of closing electronic vacuum pump.
In step S405, control unit 130 generates and makes electronic vacuum pump keep the control command of original open/close states and enter the step S205 in Fig. 2.
Although represented and discussed aspects more of the present invention, but those skilled in the art it is appreciated that and can change in above-mentioned under the condition not deviating from the principle of the invention and spirit, and therefore scope of the present invention limited by claim and equivalent content.
Claims (10)
1. a control method for auto electronic vacuum pump, comprises the following steps:
Obtain the vacuum levels in vacuum booster;
Described vacuum levels and control threshold value are compared the open/close states determined residing for electronic vacuum pump; And
Described electronic vacuum pump is made to be in unlatching or closed condition according to the result compared,
It is characterized in that, carry out dynamic conditioning according to the current residing sea level elevation of vehicle to described control threshold value, wherein, when described sea level elevation is higher, described control threshold value is less.
2. the control method of auto electronic vacuum pump according to claim 1, wherein, utilizes the current residing sea level elevation of the measurement signal determination vehicle of ambient atmosphere pressure sensor.
3. the control method of auto electronic vacuum pump according to claim 1, wherein, described control threshold value comprises opens threshold value and closes threshold value, and described unlatching threshold value is less than described closedown threshold value and determines the open/close states residing for described electronic vacuum pump according to following condition:
If described vacuum levels is less than or equal to described unlatching threshold value, then open described electronic vacuum pump;
If described vacuum levels is greater than described closedown threshold value, then close described electronic vacuum pump;
If but described vacuum levels is greater than described unlatching threshold value is less than or equal to described closedown threshold value, then make the state that described electronic vacuum pump keeps original.
4. the control method of auto electronic vacuum pump according to claim 3, wherein, between zero sea level elevation and the first sea level elevation, described unlatching threshold value and closedown threshold value are steady state value, between the first sea level elevation and the second sea level elevation, described unlatching threshold value and closedown threshold value linearly reduce with the rising of sea level elevation, and between the second sea level elevation and the 3rd sea level elevation, described unlatching threshold value is steady state value and described closedown threshold value linearly reduces with the rising of sea level elevation.
5. the control method of auto electronic vacuum pump according to claim 4, wherein, within the scope of whole sea level elevation, it is the preset value of positive number that described closedown threshold value is greater than a value with the difference of opening threshold value.
6. a controlled vehicle-mounted electrical unit, the control unit comprising input block, output unit and be coupled with described input block and output unit, wherein, described input block is configured to receive measurement signal from sensor, described control unit is configured to generate control command according to described measurement signal, described output unit is configured to export described control command to actuating unit, and wherein, described control unit is further configured to and generates described control command according to following manner:
Vacuum levels in the vacuum booster recorded by sensor and control threshold value compare the open/close states determined residing for electronic vacuum pump; And
The control command making described electronic vacuum pump be in unlatching or closed condition is generated according to the result compared,
It is characterized in that, described control unit is configured to carry out dynamic conditioning according to the current residing sea level elevation of vehicle to described control threshold value, and wherein when described sea level elevation is higher, described control threshold value is less.
7. controlled vehicle-mounted electrical unit according to claim 6, wherein, described control unit utilizes the measurement signal of ambient atmosphere pressure sensor to determine the current residing sea level elevation of vehicle.
8. controlled vehicle-mounted electrical unit according to claim 6, wherein, described control threshold value comprises opens threshold value and closes threshold value, and described unlatching threshold value is less than described closedown threshold value and described control unit determines the open/close states residing for described electronic vacuum pump according to following condition:
If described vacuum levels is less than or equal to described unlatching threshold value, then open described electronic vacuum pump;
If described vacuum levels is greater than described closedown threshold value, then close described electronic vacuum pump;
If but described vacuum levels is greater than described unlatching threshold value is less than or equal to described closedown threshold value, then make the state that described electronic vacuum pump keeps original.
9. controlled vehicle-mounted electrical unit according to claim 8, wherein, between zero sea level elevation and the first sea level elevation, described unlatching threshold value and closedown threshold value are steady state value, between the first sea level elevation and the second sea level elevation, described unlatching threshold value and closedown threshold value linearly reduce with the rising of sea level elevation, and between the second sea level elevation and the 3rd sea level elevation, described unlatching threshold value is steady state value and described closedown threshold value linearly reduces with the rising of sea level elevation.
10. controlled vehicle-mounted electrical unit according to claim 9, wherein, within the scope of whole sea level elevation, it is the preset value of positive number that described closedown threshold value is greater than a value with the difference of opening threshold value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410049038.8A CN104828050B (en) | 2014-02-12 | 2014-02-12 | The control method of auto electronic vavuum pump and the controlled vehicle-mounted electrical unit for realizing this method |
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| CN201410049038.8A CN104828050B (en) | 2014-02-12 | 2014-02-12 | The control method of auto electronic vavuum pump and the controlled vehicle-mounted electrical unit for realizing this method |
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| CN105235669A (en) * | 2015-10-30 | 2016-01-13 | 北京新能源汽车股份有限公司 | Brake boosting control system, control method thereof and vehicle |
| CN105539409A (en) * | 2015-11-30 | 2016-05-04 | 北京新能源汽车股份有限公司 | Brake boosting system of vehicle and vehicle with same |
| CN105966382A (en) * | 2016-05-03 | 2016-09-28 | 北京新能源汽车股份有限公司 | Electric automobile and method and device for estimating altitude of environment in electric automobile |
| CN106379303A (en) * | 2016-10-26 | 2017-02-08 | 浙江吉利控股集团有限公司 | Automotive electric vacuum pump control system and method |
| CN106740781A (en) * | 2017-01-18 | 2017-05-31 | 安徽江淮汽车集团股份有限公司 | A kind of control system and method for vacuum automobile power-assisted |
| CN107933462A (en) * | 2017-11-20 | 2018-04-20 | 中车株洲电力机车有限公司 | A kind of control method and device of vehicle subsidiary engine |
| CN108773368A (en) * | 2018-04-24 | 2018-11-09 | 上海思致汽车工程技术有限公司 | A kind of auto electronic vacuum method for controlling pump automatically adjusted with height above sea level |
| CN110979288A (en) * | 2019-12-27 | 2020-04-10 | 郑州日产汽车有限公司 | Pure electric vehicle intelligent vacuum pump control system and method based on whole vehicle CAN architecture |
| CN113954800A (en) * | 2021-11-26 | 2022-01-21 | 南京工业大学 | Electric vacuum power-assisted braking system and method |
| CN114475549A (en) * | 2022-02-28 | 2022-05-13 | 东风小康汽车有限公司重庆分公司 | Control method, device and equipment for electronic vacuum pump of electric automobile and storage medium |
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| CN107933462A (en) * | 2017-11-20 | 2018-04-20 | 中车株洲电力机车有限公司 | A kind of control method and device of vehicle subsidiary engine |
| CN107933462B (en) * | 2017-11-20 | 2020-12-11 | 中车株洲电力机车有限公司 | Control method and device for auxiliary engine of vehicle |
| CN108773368A (en) * | 2018-04-24 | 2018-11-09 | 上海思致汽车工程技术有限公司 | A kind of auto electronic vacuum method for controlling pump automatically adjusted with height above sea level |
| CN110979288A (en) * | 2019-12-27 | 2020-04-10 | 郑州日产汽车有限公司 | Pure electric vehicle intelligent vacuum pump control system and method based on whole vehicle CAN architecture |
| CN113954800A (en) * | 2021-11-26 | 2022-01-21 | 南京工业大学 | Electric vacuum power-assisted braking system and method |
| CN114475549A (en) * | 2022-02-28 | 2022-05-13 | 东风小康汽车有限公司重庆分公司 | Control method, device and equipment for electronic vacuum pump of electric automobile and storage medium |
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