CN104149766A - Working condition based method and device for adjusting electronic vacuum pumps of automobile brake system - Google Patents
Working condition based method and device for adjusting electronic vacuum pumps of automobile brake system Download PDFInfo
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- CN104149766A CN104149766A CN201410373286.8A CN201410373286A CN104149766A CN 104149766 A CN104149766 A CN 104149766A CN 201410373286 A CN201410373286 A CN 201410373286A CN 104149766 A CN104149766 A CN 104149766A
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- vacuum
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- vacuum pump
- brake system
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Abstract
The invention discloses a working condition based method and device for adjusting electronic vacuum pumps of an automobile brake system. The method includes that a vacuum sensor is arranged inside a vacuum booster of a automobile braking system, vacuum degree in the vacuum booster is acquired through the vacuum sensor and transformed into vacuum voltage which is compared with comparing reference voltage representing preset vacuum degree; the comparing reference voltage is variable voltage and is used for regulating difference value between atmospheric pressure and pressure of a vacuum chamber in the vacuum booster. The device comprises a comparing voltage regulation circuit, a comparing voltage regulator, a comparing output circuit and the vacuum sensor. The device is simple in structure and convenient to operate. Start-stop action of the electronic vacuum pumps are regulated and controlled by comparing input signals of the sensor and the reference signals. Under the different environment pressure, pressure difference between the vacuum cavity of the vacuum booster and the exterior can be automatically sustained, and consistency in sense of braking of a user and perfection in braking efficiency can be guaranteed.
Description
Technical field
The present invention relates to a kind of method brake system of car electronic vacuum pump being regulated based on operating mode and device.
Background technology
Along with the development of automobile and electronics industry level, the application of Eltec on modern automobile industry is more and more extensive, and on automobile, original machinery controls is all replaced by electronic control package gradually, and it is perfect that the performance of car load, technical merit are constantly tending towards.The application of Eltec has very important effect for improvement automotive performance, raising driving safety, reduction pollution, the saving energy.As the critical piece about automotive safety and traveling comfort, the development of brake system also will be along with electronic trend is constantly progressive.
As a kind of emerging automobile vacuum source, electronic vacuum pump has started use progressively on electronlmobil and part high-grade car.For as base vacuum source, or in vacuum degree deficiency vacuum source as a supplement, guarantee that automobile has enough negative pressure in braking, provides stable power-assisted, guarantee driving safety.
Electronic vacuum pump has high efficiency, high energy efficiency ratio, the feature of high steerability.Because vacuum pump is completely by power supply energy supply, its start-stop state can be controlled by electric component very easily, therefore can have the regulative mode of more diversification, adapts to different operating modes and carrys out work.The relation being inversely proportional to due to the size of brake pedal force and the degree of vacuum size of vacuum booster in addition, can be by regulating the degree of vacuum of vacuum booster, user's impression when carrying out adjustable brake.
The electronic vacuum pump control circuit using on automobile is at present as Fig. 1, Pin30 connects positive source, and Pin31 connects power cathode, and on connects the output signal of automobile ECU, the threshold value of output signal is demarcated as certain value in ECU, when the degree of vacuum of vacuum booster is too low, vacuum sensor output voltage is lower than threshold value, and ECU exports high level, electronic vacuum pump is started working, until reach vacuum sensor signal, reach threshold value, ECU output low level, electronic vacuum pump quits work.The vacuum boost system that fortune is controlled in this way, the air pressure in its vacuum booster vacuum chamber will remain on a fixed value.When due to a variety of causes, for example height above sea level changes, and temperature change, while causing extraneous ambient pressure to change, the degree of vacuum of traditional vacuum booster pump force aid system can't change, so the vacuum chamber of vacuum booster and extraneous difference of pressure change.And it is well-known, the poor relation for being inversely proportional to of the size of brake pedal force and vacuum booster vacuum chamber pressure and atmospheric environmental pressure, braking effect and this difference of pressure are proportional, and at this time the change of the non-client's of following will will occur thereupon for pedal feel and braking effect.
Summary of the invention
The invention provides a kind of method brake system of car electronic vacuum pump being regulated based on operating mode and device, its object is, overcome in prior art when ambient pressure changes the problem that uncontrollable electronic vacuum pump is consistent vacuum chamber pressure in vacuum booster and ambient pressure difference.
A kind of method brake system of car electronic vacuum pump being regulated based on operating mode, in the vacuum booster of brake system of car, vacuum sensor is set, by vacuum sensor, the degree of vacuum in vacuum booster is gathered and is converted to degree of vacuum voltage, then compare with the benchmark voltage of the default degree of vacuum of representative, if degree of vacuum voltage is less than benchmark voltage, be that in vacuum booster, degree of vacuum is less than default degree of vacuum, start electronic vacuum pump, increase the degree of vacuum in vacuum booster, until degree of vacuum voltage is when equate with benchmark voltage, stop electronic vacuum pump work, described benchmark voltage is variable voltage, with the difference of the vacuum chamber pressure in Gas regulation pressure and vacuum booster.
Described benchmark voltage is provided by benchmark potential circuit, in described benchmark potential circuit, is provided with variable resistance, and described variable resistance is by resistance being manually set to adjust the benchmark voltage of benchmark potential circuit output.
By resistance is manually set, change is as the benchmark voltage of vacuum pump on off control, make pressure in vacuum pump and the difference generation respective change between barometric pressure, thereby provide the fixedly difference between the required barometric pressure maintaining and the vacuum chamber pressure in vacuum pump under corresponding operating mode, to be suitable for the needs of multi-state.
Described benchmark voltage is provided by benchmark potential circuit, in described benchmark potential circuit, is provided with pizo-resistance, and described pizo-resistance changes resistance to adjust the benchmark voltage of benchmark potential circuit output with change of atmospheric pressure.
Adopt pizo-resistance, barometric pressure in external environment changes, benchmark voltage is synchronously followed variation, pressure and barometric pressure in vacuum pump are changed simultaneously, therefore the difference between the vacuum chamber pressure in barometric pressure and vacuum pump can remain on the fixedly difference of setting, rather than vacuum chamber pressure maintains fixed value, thereby guarantees when external environment changes under any operating mode, all can provide fixedly difference, meet the needs of braking effect.
Described pizo-resistance resistance and atmospheric force value are linear.
The pizo-resistance that resistance value and barometric pressure are linear, without extra design, can accurately provide required benchmark voltage, as the threshold value of vacuum pump on off control.
A kind of device brake system of car electronic vacuum pump being regulated based on operating mode, the method based on operating mode, brake system of car electronic vacuum pump being regulated described in adopting, comprises comparative voltage regulating circuit, comparative voltage regulating control, comparison output circuit and vacuum sensor;
Described vehicle power is the power supply of comparative voltage regulating circuit;
Described comparative voltage regulating control is connected with comparative voltage regulating circuit, for regulating the benchmark comparative voltage of comparative voltage regulating circuit output;
Described vacuum sensor is installed in vacuum booster, described relatively two input ends of output circuit are connected with vacuum sensor with the mouth of comparative voltage regulating circuit respectively, and the described relatively mouth of output circuit and the control end of electronic vacuum pump are connected.
Voltage regulating module in described comparative voltage regulating control is rheostat.
Rheostat can be simple and quick realize dividing potential drop, thereby change benchmark voltage, provide the difference between the required barometric pressure maintaining and the vacuum chamber pressure in vacuum pump under corresponding operating mode, to be suitable for the needs of multi-state.
Voltage regulating module in described comparative voltage regulating control is pizo-resistance.
Voltage regulating module in described comparative voltage regulating control is rheostat and the pizo-resistance of series connection.
Utilize rheostat to change the fixedly variable part of the required benchmark voltage of corresponding operating mode, the fixedly difference under corresponding certain operating mode of described fixedly variable part between the required barometric pressure maintaining and the vacuum chamber pressure in vacuum pump; Utilize pizo-resistance to follow the real-time variable part of barometric pressure synchronous change benchmark voltage, described real-time variable part correspondence makes the difference between the vacuum chamber pressure in barometric pressure and vacuum pump can remain on the benchmark voltage of the fixedly difference of setting, both stacks obtain benchmark voltage required under corresponding operating mode, guarantee that the difference under corresponding operating mode between the required barometric pressure maintaining and the vacuum chamber pressure in vacuum pump is constant under any environment.
Described rheostat is provided with display unit.
By display unit, can see intuitively the resistance arranging on rheostat, the resistance required by corresponding operating mode regulates.
Also comprise the mu balanced circuit being connected with vehicle power, described mu balanced circuit is connected with described comparative voltage regulating circuit.
Described mu balanced circuit is connected with vehicle power, can provide reliable and stable power supply for this device.
Beneficial effect
The invention provides a kind of method brake system of car electronic vacuum pump being regulated based on operating mode and device, in the vacuum booster of brake system of car, vacuum sensor is set, by vacuum sensor, the degree of vacuum in vacuum booster is gathered and is converted to degree of vacuum voltage, then compare with the benchmark voltage of the default degree of vacuum of representative, if degree of vacuum voltage is less than benchmark voltage, be that in vacuum booster, degree of vacuum is less than default degree of vacuum, start electronic vacuum pump, increase the degree of vacuum in vacuum booster, until degree of vacuum voltage is when equate with benchmark voltage, stop electronic vacuum pump work, described benchmark voltage is variable voltage, with the difference of the vacuum chamber pressure in Gas regulation pressure and vacuum booster.This device comprises comparative voltage regulating circuit, comparative voltage regulating control, comparison output circuit and vacuum sensor; Described apparatus structure is simple, easy to operate; By a large amount of research, found the problem of the poor effect when the environmental change of braking effect in electronic car, while changing due to ambient atmosphere pressure, in vacuum pump, the adjusting of vacuum chamber pressure maintains a fixed value always, thereby make vacuum chamber pressure in vacuum pump with atmospheric difference, variation occur in control process, and cannot keep fixing difference to cause; Therefore by the benchmark voltage of voltage variable is set cleverly, solved this problem, concrete advantage is as follows:
1. operator can manually regulate the required benchmark voltage of brake system operating mode according to the different demands of self, by changing the fixedly variable part of benchmark voltage, obtain the required fixation pressure difference of different operating modes, to reach, improve brake pedal feel, the object of brake efficiency, strengthens user and experiences;
2. under varying environment air pressure, automatically maintain vacuum booster vacuum chamber and extraneous difference of pressure, guarantee the intact of the conformability of user's brake feel and brake efficiency, to preventing the brake pedal hardening of highlands, or during ambient pressure sudden change, incident braking distance increases, the hidden danger that rear-end collision probability increases;
3. when emergency braking or continuous braking cause degree of vacuum sharply to decline, can get involved voluntarily fast, effectively guarantee braking effect;
4. while braking, power failure can provide vacuum source, guarantees safety, for example, after power failure is stopped working on long downhill path, automatically gets involved the reliability of enhancing brake system.
Accompanying drawing explanation
Fig. 1 is the control circuit figure of prior art intermediate pump;
Fig. 2 is the structural representation of device of the present invention;
Fig. 3 is the structural representation of mu balanced circuit described in the present invention;
Fig. 4 is the control circuit schematic diagram of application device control of the present invention vacuum pump;
Label declaration: 1-mu balanced circuit, 2-comparative voltage regulating circuit, 3-comparative voltage regulating control, 4-be output circuit relatively.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
A kind of method brake system of car electronic vacuum pump being regulated based on operating mode, in the vacuum booster of brake system of car, vacuum sensor is set, by vacuum sensor, the degree of vacuum in vacuum booster is gathered and is converted to degree of vacuum voltage, then compare with the benchmark voltage of the default degree of vacuum of representative, if degree of vacuum voltage is less than benchmark voltage, be that in vacuum booster, degree of vacuum is less than default degree of vacuum, start electronic vacuum pump, increase the degree of vacuum in vacuum booster, until degree of vacuum voltage is when equate with benchmark voltage, stop electronic vacuum pump work, described benchmark voltage is variable voltage, with the difference of the vacuum chamber pressure in Gas regulation pressure and vacuum booster.
Described benchmark voltage is provided by benchmark potential circuit, in described benchmark potential circuit, is provided with variable resistance, and described variable resistance is by resistance being manually set to adjust the benchmark voltage of benchmark potential circuit output.
By resistance is manually set, change is as the benchmark voltage of vacuum pump on off control, make pressure in vacuum pump and the difference generation respective change between barometric pressure, thereby provide the fixedly difference between the required barometric pressure maintaining and the vacuum chamber pressure in vacuum pump under corresponding operating mode, to be suitable for the needs of multi-state.
Described benchmark voltage is provided by benchmark potential circuit, in described benchmark potential circuit, is provided with pizo-resistance, and described pizo-resistance changes resistance to adjust the benchmark voltage of benchmark potential circuit output with change of atmospheric pressure.
Adopt pizo-resistance, barometric pressure in external environment changes, benchmark voltage is synchronously followed variation, pressure and barometric pressure in vacuum pump are changed simultaneously, therefore the difference between the vacuum chamber pressure in barometric pressure and vacuum pump can remain on the fixedly difference of setting, rather than vacuum chamber pressure maintains fixed value, thereby guarantees when external environment changes under any operating mode, all can provide fixedly difference, meet the needs of braking effect.
Described pizo-resistance resistance and atmospheric force value are linear.
The pizo-resistance that resistance value and barometric pressure are linear, without extra design, can accurately provide required benchmark voltage, as the threshold value of vacuum pump on off control.
As shown in Figure 2, a kind of device brake system of car electronic vacuum pump being regulated based on operating mode, the method based on operating mode, brake system of car electronic vacuum pump being regulated described in adopting, comprises comparative voltage regulating circuit 2, comparative voltage regulating control 3, compares output circuit 4 and vacuum sensor;
Described vehicle power is the power supply of comparative voltage regulating circuit;
Described comparative voltage regulating control is connected with comparative voltage regulating circuit, for regulating the benchmark comparative voltage of comparative voltage regulating circuit output;
Described vacuum sensor is installed in vacuum booster, described relatively two input ends of output circuit are connected with vacuum sensor with the mouth of comparative voltage regulating circuit respectively, and the described relatively mouth of output circuit and the control end of electronic vacuum pump are connected.
Voltage regulating module in described comparative voltage regulating control is rheostat.
Rheostat can be simple and quick realize dividing potential drop, thereby change benchmark voltage, provide the difference between the required barometric pressure maintaining and the vacuum chamber pressure in vacuum pump under corresponding operating mode, to be suitable for the needs of multi-state.
Voltage regulating module in described comparative voltage regulating control is pizo-resistance.
Voltage regulating module in described comparative voltage regulating control is rheostat and the pizo-resistance of series connection.
Utilize rheostat to change the fixedly variable part of the required benchmark voltage of corresponding operating mode, the fixedly difference under corresponding certain operating mode of described fixedly variable part between the required barometric pressure maintaining and the vacuum chamber pressure in vacuum pump; Utilize pizo-resistance to follow the real-time variable part of barometric pressure synchronous change benchmark voltage, described real-time variable part correspondence makes the difference between the vacuum chamber pressure in barometric pressure and vacuum pump can remain on the benchmark voltage of the fixedly difference of setting, both stacks obtain benchmark voltage required under corresponding operating mode, guarantee that the difference under corresponding operating mode between the required barometric pressure maintaining and the vacuum chamber pressure in vacuum pump is constant under any environment.
Described rheostat is provided with display unit.
By display unit, can see intuitively the resistance arranging on rheostat, the resistance required by corresponding operating mode regulates.
As shown in Figure 3, also comprise the mu balanced circuit 1 being connected with vehicle power, described mu balanced circuit is connected with described comparative voltage regulating circuit.
Described mu balanced circuit is connected with vehicle power, can provide reliable and stable power supply for this device.
As shown in Figure 4, mu balanced circuit U0 port is connected AUTOMOTIVE RELAY box to the principle of work of whole device with Vc++, energising after car key inserts; Ux port connects vacuum booster vacuum sensor mouth; Output voltage U port connects vacuum pump both positive and negative polarity.The output voltage of vehicle power is carried out to voltage stabilizing through mu balanced circuit, again by comparative voltage regulating circuit output benchmark voltage U r, by the signal voltage Ux of vacuum sensor and benchmark comparative voltage Ur are compared to export the value of vacuum pump on off control voltage U, thereby control the work of electronic vacuum pump;
When degree of vacuum declines, vacuum sensor signal voltage Ux declines thereupon, when Ux drops to lower than reference voltage Ur, and comparator circuit output high level, the actuating of relay, the voltage of mouth U is vehicle carried power voltage, and now vacuum pump work starts extracting vacuum, when degree of vacuum with vacuum pump work, increase until surpass threshold value, now Ux is increased to thereupon and is greater than Ur, comparator circuit output low level, and relay quits work.So just, reached by Ux and Ur being compared to control the object of electronic vacuum pump start and stop.
Comparative voltage regulating control is visualization regulation device intuitively, can need to regulate the size of benchmark voltage U r according to user.
This device is by the switching that the degree of vacuum signal of vacuum sensor output and reference voltage are compared to control electronic vacuum pump, to reach the object that maintains vacuum booster degree of vacuum, according to the needs of user and car load operating mode, comparative voltage regulating circuit can regulate the output voltage of reference voltage output circuit, thereby control vacuum booster degree of vacuum, finally realize the adjusting to treadle effort and braking effect.
Claims (10)
1. method brake system of car electronic vacuum pump being regulated based on operating mode, in the vacuum booster of brake system of car, vacuum sensor is set, by vacuum sensor, the degree of vacuum in vacuum booster is gathered and is converted to degree of vacuum voltage, then compare with the benchmark voltage of the default degree of vacuum of representative, if degree of vacuum voltage is less than benchmark voltage, be that in vacuum booster, degree of vacuum is less than default degree of vacuum, start electronic vacuum pump, increase the degree of vacuum in vacuum booster, until degree of vacuum voltage is when equate with benchmark voltage, stop electronic vacuum pump work, it is characterized in that, described benchmark voltage is variable voltage, with the difference of the vacuum chamber pressure in Gas regulation pressure and vacuum booster.
2. the method based on operating mode, brake system of car electronic vacuum pump being regulated according to claim 1, it is characterized in that, described benchmark voltage is provided by benchmark potential circuit, in described benchmark potential circuit, be provided with variable resistance, described variable resistance is by resistance being manually set to adjust the benchmark voltage of benchmark potential circuit output.
3. method brake system of car electronic vacuum pump being regulated based on operating mode according to claim 1, it is characterized in that, described benchmark voltage is provided by benchmark potential circuit, in described benchmark potential circuit, be provided with pizo-resistance, described pizo-resistance changes resistance to adjust the benchmark voltage of benchmark potential circuit output with change of atmospheric pressure.
4. method brake system of car electronic vacuum pump being regulated based on operating mode according to claim 3, is characterized in that, described pizo-resistance resistance and atmospheric force value are linear.
5. device brake system of car electronic vacuum pump being regulated based on operating mode, it is characterized in that, the method based on operating mode, brake system of car electronic vacuum pump being regulated described in employing claim 1, comprises comparative voltage regulating circuit, comparative voltage regulating control, comparison output circuit and vacuum sensor;
Described vehicle power is the power supply of comparative voltage regulating circuit;
Described comparative voltage regulating control is connected with comparative voltage regulating circuit, for regulating the benchmark comparative voltage of comparative voltage regulating circuit output;
Described vacuum sensor is installed in vacuum booster, described relatively two input ends of output circuit are connected with vacuum sensor with the mouth of comparative voltage regulating circuit respectively, and the described relatively mouth of output circuit and the control end of electronic vacuum pump are connected.
6. device brake system of car electronic vacuum pump being regulated based on operating mode according to claim 5, is characterized in that, the voltage regulating module in described comparative voltage regulating control is rheostat.
7. device brake system of car electronic vacuum pump being regulated based on operating mode according to claim 5, is characterized in that, the voltage regulating module in described comparative voltage regulating control is pizo-resistance.
8. device brake system of car electronic vacuum pump being regulated based on operating mode according to claim 5, is characterized in that, the voltage regulating module in described comparative voltage regulating control is rheostat and the pizo-resistance of series connection.
9. according to device brake system of car electronic vacuum pump being regulated based on operating mode described in claim 6 or 8, it is characterized in that, described rheostat is provided with display unit.
10. according to device brake system of car electronic vacuum pump being regulated based on operating mode described in claim 5-8 any one, it is characterized in that, also comprise the mu balanced circuit being connected with vehicle power, described mu balanced circuit is connected with described comparative voltage regulating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410373286.8A CN104149766A (en) | 2014-07-31 | 2014-07-31 | Working condition based method and device for adjusting electronic vacuum pumps of automobile brake system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410373286.8A CN104149766A (en) | 2014-07-31 | 2014-07-31 | Working condition based method and device for adjusting electronic vacuum pumps of automobile brake system |
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| CN104149766A true CN104149766A (en) | 2014-11-19 |
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| CN201410373286.8A Pending CN104149766A (en) | 2014-07-31 | 2014-07-31 | Working condition based method and device for adjusting electronic vacuum pumps of automobile brake system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107444196A (en) * | 2017-09-05 | 2017-12-08 | 重庆凯瑞电动汽车系统有限公司 | Electric automobile with vacuum pump control system |
| CN111720724A (en) * | 2020-06-19 | 2020-09-29 | 深圳市长深气体有限公司 | Safe gas filling station |
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| CN102371984A (en) * | 2011-08-29 | 2012-03-14 | 温州大学 | Vacuum boosting device of electric vehicle |
| CN102381302A (en) * | 2011-08-23 | 2012-03-21 | 重庆小康工业集团股份有限公司 | Analog-to-digital electric vacuum assistance system and air pressure control method |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050178622A1 (en) * | 2004-02-18 | 2005-08-18 | Scott Blue | Altitude compensating trailer brake system |
| EP1681219A2 (en) * | 2005-01-18 | 2006-07-19 | Fuji Jukogyo Kabushiki Kaisha | Control system for brake vacuum pump |
| CN201816579U (en) * | 2010-09-25 | 2011-05-04 | 阿尔特(中国)汽车技术有限公司 | Brake assist system for electric automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107444196A (en) * | 2017-09-05 | 2017-12-08 | 重庆凯瑞电动汽车系统有限公司 | Electric automobile with vacuum pump control system |
| CN111720724A (en) * | 2020-06-19 | 2020-09-29 | 深圳市长深气体有限公司 | Safe gas filling station |
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Address after: 410100 No. 18, Ying Xia Road, Changsha economic and Technological Development Zone, Hunan, Changsha Applicant after: Chrysler Automobile Co., Ltd of Fiat of Guangzhou Automobile Workshop Address before: 410100 No. 18, Ying Xia Road, Changsha economic and Technological Development Zone, Hunan, Changsha Applicant before: GAC FIAT AUTOMOBILE CO., LTD. |
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Application publication date: 20141119 |
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