CN205315129U - Vehicle auxiliary braking system all based on circulation of engine negative work - Google Patents
Vehicle auxiliary braking system all based on circulation of engine negative work Download PDFInfo
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- CN205315129U CN205315129U CN201620038159.7U CN201620038159U CN205315129U CN 205315129 U CN205315129 U CN 205315129U CN 201620038159 U CN201620038159 U CN 201620038159U CN 205315129 U CN205315129 U CN 205315129U
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Abstract
The utility model relates to an engine auxiliary braking device technical field is a vehicle auxiliary braking system all based on circulation of engine negative work particularly. Including ECU, wheel owner stopper brake performance detection module, wheel owner stopper brake performance detection module be connected with ECU, still include all cockpit suggestion operation module of engine auxiliary braking system, engine auxiliary braking system all cockpit suggestion operation module including the wheel owner stopper brake performance suggestion device and the engine auxiliary braking device starting drive that all are connected with ECU, still including the engine auxiliary braking system interconnected system executable module that receives ECU control, still including the interior burning condition monitoring module of the engine cylinder who detects the interior burning circumstances of engine cylinder, burning condition monitoring module is connected with ECU in the engine cylinder. The utility model discloses can make the vehicle be expert at and sail the in -process and can provide enough and suitable brake force, emergency braking stops when making the vehicle keep the speed of a motor vehicle or stopper to lose efficacy.
Description
Technical field
The utility model relates to the auxiliary drift stop technical field of engine, specifically a kind of auxiliary breaking system of the vehicle based on the circulation of engine negative work.
Background technology
Entering for 21st century, the automotive industry of China steps into high-speed development period, and automobile industry safety problem is the focus that automobile industry and Road transport department pay close attention in recent years always. Traditional vehicle active breaking system can produce bigger braking power within the short period of time, but the growth along with braking time, owing to the heat produced can not pass to surrounding environment in time so that the temperature of stopper constantly raises, there is heat fading phenomenon. Especially for the bigger heavy-duty commercial vehicle of deadweight, its brake efficiency easily declines, and then brake fade phenomenon occurs, and causes pernicious traffic accident.
According to statistics, China's traffic fatalities account for the 15% of the whole world, become the most multiple country of traffic accident, the ratio accounting for total accident due to brake fade and bad the caused motor vehicle accident of braking is respectively more than 20% with 40%, and the death toll that braking ability decline causes with the two big reasons that lost efficacy exceedes the 50% of total death toll. Due to the restriction by orographic factor, in the road of China, especially in southwest, the large percentage shared by the road of mountain area, the accident caused due to heavy-duty commercial vehicle misfunctioning of brake occurs again and again. Vehicle is when mountain area road descending travels, the energy utilizing breaking system to cut down is needed to also have gravitional force except the kinetic energy of vehicle, easily losing when main brake device works for a long time under high loading operating mode or partly lose brake efficiency, therefore traditional braking device has not met the automobile requirement that especially heavy-duty commercial vehicle is braked continuously on road.
Research finds, engine, as propulsion source unique on automobile, by changing and adjust operation pattern, plays the effect of auxiliary braking. Common engine supplementary mode is exhaust braking, is namely improved the back pressure of engine exhaust strokes by the means of throttling, reduces the output rating of engine, thus relatively play the effect of anti-dragged brake.But the effect of engine exhaust and brake is very micro-, when damping force needed for vehicle is relatively big or cannot provide enough brake efficiency during brake fade. And the working process of Otto cycle engine comprises air inlet, compression, acting, exhaust four strokes, wherein only expansion stroke externally exports positive merit, and its excess-three stroke all does negative work. Therefore suitably reduce the positive merit that engine externally exports, increase the negative work self operating and consuming, good braking effect can be produced.
Practical novel content
The purpose of this utility model is the auxiliary breaking system of vehicle provided based on the circulation of engine negative work, when vehicle brake degradation or inefficacy, when additionally not increasing equipment, engine is worked under negative work state of cyclic operation, it is provided that suitable damping force makes vehicle keep the speed of a motor vehicle or snub.
For achieving the above object, basic technology scheme of the present utility model is to provide the auxiliary breaking system of the vehicle based on the circulation of engine negative work, comprises ECU, wheel main brake device brake function test module, and wheel main brake device brake function test module is connected with ECU; Also comprising the auxiliary breaking system cab prompting operation module of engine, engine auxiliary breaking system cab prompting operation module comprises the wheel main brake device braking ability suggestion device being all connected and the auxiliary drift stop starter gear of engine with ECU; Also comprising the auxiliary breaking system execution module of the engine by ECU control, the auxiliary breaking system execution module of engine comprises fuel supply device and Variable Valve Time mechanism; Also comprising the engine cylinder combustion condition monitor module of detection engine cylinder combustion situation, engine cylinder combustion condition monitor module is connected with ECU.
In above-mentioned basic technology scheme, by the braking ability of wheel main brake device brake function test module Real-Time Monitoring wheel braking device, and data signal is passed to ECU, after ECU receives data signal, handle it, and indicate the auxiliary breaking system cab prompting operation module of engine, make wheel main brake device braking ability suggestion device make the prompting of the inefficacy of wheel main brake device braking or decline. Officer, after receiving prompting, makes the auxiliary drift stop of starting engine according to actual state, and the auxiliary drift stop of engine will perform information feed back to ECU after receiving the operation instruction of officer; After ECU receives the instruction that officer opens the auxiliary drift stop of engine, the instruction auxiliary breaking system execution module of control engine according to the information of execution, control fuel supply device and Variable Valve Time mechanism is required according to instruction, control Variable Valve Time mechanism changes the engine inlet and exhaust valve opening and closing moment, fuel supply device changes Injection strategy simultaneously, so that realizing the circulation of engine negative work. Meanwhile, engine cylinder combustion condition monitor module Real-Time Monitoring in-cylinder combustion condition, and monitoring information is passed to ECU, ECU makes instruction according to monitoring information, correspondingly adjust distribution timing and Injection strategy, stablize engine negative work state of cyclic operation, it is achieved closed-loop control.
The beneficial effects of the utility model are: can in vehicle movement process, the information decline of wheel of vehicle main brake device braking ability being detected or lost efficacy, and officer can be reminded by displaying after information processing, officer can make operational order, engine variable-valve timing mechanism and fuel supply device are made control, adjustment inlet and exhaust valve opening and closing moment and Injection strategy, when additionally not increasing equipment, utilize the power of engine self that vehicle transmission system is done negative work, reach the object of auxiliary braking, namely vehicle can provide enough and suitable damping force in the process of moving, vehicle is made to keep the speed of a motor vehicle or snub is stopped during misfunctioning of brake.Meanwhile, native system is also provided with engine cylinder combustion condition monitor module, Real-Time Monitoring in-cylinder combustion condition, distribution timing and Injection strategy is correspondingly adjusted by Detection Information, stablize engine negative work state of cyclic operation, it is achieved closed-loop control, the safety performance of lifting system.
The preferred version 1 that the improvement of base case is obtained: wheel main brake device brake function test module comprises wheel brake pressure sensor and vehicle speed sensor; Wheel brake pressure sensor can detect wheel and be expert at the brake pressure in sailing, vehicle speed sensor can detect wheel and be expert at the speed in sailing, combined by both, the damping force that wheel is subject in traveling and the relation of wheel velocity can be judged, thus judge wheel main brake device braking ability intact, decline or lost efficacy.
The preferred version 2 that the improvement of base case is obtained: engine cylinder combustion condition monitor module comprises temperature sensor in engine cylinder pressure sensor and engine cylinder; The combustion information of engine can be drawn by detection engine in-cylinder pressure and engine cylinder temperature preferably, the information needing monitoring can be obtained by these two monitorings.
The preferred version 3 that the further optimization of base case or preferred version 1 or preferred version 2 is obtained: wheel main brake device braking ability suggestion device is arranged on above panel board, wheel main brake device braking ability suggestion device comprises red indicating light and yellow indicator lamp, wheel main brake device braking ability suggestion device is arranged on above panel board, it is convenient to officer observe and operation, for identifying, wheel main brake device braking ability lost efficacy red indicating light, yellow indicator lamp is for identifying the decline of wheel main brake device braking ability, red and yellow can play suggesting effect preferably.
Preferred version 4 to the further optimization of preferred version 3 obtains: the oil injection time table that fuel supply device comprises fuel charge controlling organization and is located on fuel charge controlling organization, Variable Valve Time mechanism comprises intake and exhaust valve opening and closing timetable; Fuel charge controlling organization is for controlling fuel charge, oil injection time table is used to indicate injection time, fuel charge controlling organization and oil injection time table can realize the Injection strategy that ECU distributes, exhaust valve opening and closing timetable, the time being used to indicate exhaust valve opening and closing, it is convenient to control the folding of exhaust valve.
Preferred version 5 to the further optimization of preferred version 4 obtains: the auxiliary drift stop of engine comprises the first switch and the 2nd switch, first switch, ECU and Variable Valve Time mechanism connect, after 2nd switch and ECU connect, ECU connects with fuel supply device and Variable Valve Time mechanism more respectively. First switch can control Variable Valve Time mechanism by ECU, when yellow indicator lamp is bright, when namely wheel main brake device braking ability declines, starts the first switch, and the control inlet and exhaust valve opening and closing moment can play braking effect; First switch can by ECU with control Variable Valve Time mechanism and fuel supply device, when red indicating light is bright, namely when wheel main brake device braking ability lost efficacy, starting the 2nd switch, amount and the oil injection time of control inlet and exhaust valve opening and closing moment and oil spout can play braking effect.
Preferred version 6 to the further optimization of preferred version 5 obtains: fuel supply device is cylinder injection fuel feeding device; The mode of cylinder injection fuel feeding is convenient to control, it is possible to adjust the amount of oil spout and the moment of oil spout according to demand accurately.
Accompanying drawing explanation
Fig. 1 is the structural representation of the auxiliary brake system embodiment of vehicle that the utility model circulates based on engine negative work;
Fig. 2 is the workflow diagram of the auxiliary braking control system of vehicle that the utility model circulates based on engine negative work.
Embodiment
Below by embodiment and Reference numeral, the utility model is described in further detail:
Reference numeral in Figure of description comprises: ECU1, wheel main brake device brake function test module 2, the auxiliary breaking system cab prompting operation module 3 of engine, breaking system execution module 4 assisted by engine, engine cylinder combustion condition monitor module 5, wheel brake pressure sensor 6, vehicle speed sensor 7, wheel main brake device braking ability suggestion device 8, breaking system starter gear 9 assisted by engine, engine cylinder pressure sensor 10, temperature sensor 11 in engine cylinder, fuel supply device 12, Variable Valve Time mechanism 13.
Vehicle based on the circulation of engine negative work assists braking control system embodiment substantially as shown in accompanying drawing 1, Fig. 2: comprise ECU1, wheel main brake device brake function test module 2, wheel main brake device brake function test module 2 comprises wheel brake pressure sensor 6 and vehicle speed sensor 7, and wheel brake pressure sensor 6 is all connected with ECU1 with vehicle speed sensor 7. engine auxiliary breaking system cab prompting operation module 3 comprises wheel main brake device braking ability suggestion device 8 and the auxiliary drift stop starter gear of engine, wheel main brake device braking ability suggestion device 8 and the auxiliary drift stop starter gear of engine are all connected with ECU1, wheel main brake device braking ability suggestion device 8 comprises red indicating light and yellow indicator lamp, red indicating light and yellow indicator lamp are arranged on above panel board, the auxiliary drift stop starter gear of engine comprises the first switch and the 2nd switch, first switch and the 2nd switch are installed in above panel board. also comprise the auxiliary breaking system execution module 4 of the engine by ECU1 control, the auxiliary breaking system execution module 4 of engine comprises fuel supply device 12 and Variable Valve Time mechanism 13, fuel supply device 12 is cylinder injection device, the oil injection time table that fuel supply device 12 comprises fuel charge controlling organization and is arranged on fuel charge controlling organization simultaneously, Variable Valve Time mechanism 13 comprises intake and exhaust valve opening and closing timetable, first switch, ECU1 and Variable Valve Time mechanism 13 connect, and after the 2nd switch and ECU1 connect, ECU1 connects with fuel supply device 12 and Variable Valve Time mechanism 13 more respectively. engine cylinder combustion condition monitor module 5 comprises the engine cylinder pressure sensor 10 and temperature sensor 11 in engine cylinder that are all connected with ECU1, engine cylinder pressure sensor 10 and temperature sensor 11 in engine cylinder can monitoring information and information is passed to ECU1.
Vehicle is when continuous long descending travels, the braking ability of wheel main brake device brake function test module 2 Real-Time Monitoring stopper, the vehicle speed data that the brake pressure recorded by wheel brake pressure sensor 6 and vehicle speed sensor 7 record is passed to ECU1, the threshold value preset by ECU1 contrast, calculate whether current vehicle speed mates with brake pressure, judge now whether vehicle is in braking ability decline or brake fade state.
Current wheel braking ability is fed back to officer by wheel main brake device braking ability suggestion device 8 by ECU1, suggestion device is arranged on above panel board, and by the pilot lamp of different colours, information is passed to officer, when braking ability declines, pilot lamp is that yellow and yellow indicator lamp are bright, during brake fade, pilot lamp is red, and namely red indicating light is bright.After officer receives the prompting of pilot lamp, by the auxiliary breaking system starter gear 9 of operation engine, instruction signal is passed to ECU1, when namely observing that yellow indicator lamp is bright, starts the first switch, when observing that red indicating light is bright, start the 2nd switch. ECU1, for the operational order of officer, control fuel supply device 12 and Variable Valve Time mechanism 13, taked different control strategies when wheel main brake device loses efficacy and braking ability declines respectively, and concrete control strategy is as follows.
When wheel main brake device braking ability declines, it is necessary to engine provides damping force to share the task of main brake device, maintain the stable of the speed of a motor vehicle. Now do not require that engine exports higher braking power, and cylinder body structural strength is required higher by violent burning in long-time cylinder, therefore fuel supply device 12 is closed, only need the opening and closing moment being adjusted inlet and exhaust valve by control Variable Valve Time mechanism 13, thus reach required braking power, now in engine cylinder only Working fluid flow and do not burn. ECU1 controls Variable Valve Time mechanism 13 being specifically adjusted to each stroke inlet and exhaust valve opening and closing moment: charging stroke descent of piston, inlet valve and blast gate are all closed, thus produce bigger vacuum tightness in cylinder, increases the negative work that engine interior consumes. When descent of piston is to lower, Variable Valve Time mechanism 13 controls IO Intake Valve Opens, is inhaled into cylinder under the effect of air vacuum tightness in cylinder. Pressure stroke upstroke, inlet valve and blast gate are all closed, and the working medium compressed is the air being inhaled in cylinder after charging stroke end IO Intake Valve Opens, when upstroke is near top dead center, Variable Valve Time mechanism 13 controls blast gate and opens, and the air compressed is discharged cylinder. Expansion stroke descent of piston, its inlet and exhaust valve open and close controlling is identical with charging stroke, out stroke upstroke, and its inlet and exhaust valve open and close controlling is identical with pressure stroke.
During wheel main brake device brake fade, it is necessary to the damping force that engine replaces wheel main brake device to provide enough is braked, vehicle is stopped apart from the time snub that interior use is the shortest in safety braking. Now require that engine exports higher braking power, therefore fuel supply device 12 is opened, and the opening and closing moment of inlet and exhaust valve is adjusted with control Variable Valve Time mechanism 13, thus reach required braking power, now in engine cylinder, existing Working fluid flow has again burning. ECU1 controls Variable Valve Time mechanism 13 being specifically adjusted to each stroke inlet and exhaust valve opening and closing moment: it is identical that ECU1 controls adjustment when the concrete adjustment in each stroke inlet and exhaust valve opening and closing moment is declined by Variable Valve Time mechanism 13 with braking ability, charging stroke descent of piston, inlet valve and blast gate are all closed, when descent of piston is to lower, Variable Valve Time mechanism 13 controls IO Intake Valve Opens, is inhaled in cylinder under the effect of air vacuum tightness in cylinder. Pressure stroke upstroke is near top dead center, and Variable Valve Time mechanism 13 controls blast gate and opens, and discharges cylinder by by the air after compressing. Expansion stroke descent of piston, its inlet and exhaust valve open and close controlling is identical with charging stroke, out stroke upstroke, and its inlet and exhaust valve open and close controlling is identical with pressure stroke. ECU1 control fuel supply device 12 adjustment of Injection strategy is specially: charging stroke descent of piston to during lower to cylinder injection fuel oil, fuel charge is compared and is strengthened when engine normally runs, pressure stroke upstroke, gas mixture or compression autoignition is lighted when being greater than 90 ° of CA before compression top center, make gas in the jar undergoes rapid expansion, increase the downward pressure to the upstroke stage.Expansion stroke descent of piston, the control of its Injection strategy is identical with charging stroke; Out stroke upstroke, the control of its Injection strategy is identical with pressure stroke.
Engine cylinder combustion condition monitor module 5 is for Real-Time Monitoring in-cylinder combustion condition, the temperature that in the pressure that engine cylinder pressure sensor 10 detects and engine cylinder, temperature sensor 11 records all is sent to ECU1 place, ECU1 is according to the information transmitted, analyze in-cylinder combustion atmosphere, determine whether to reach the fuel fire limit under current Injection strategy, and make corresponding adjustment, thus fuel charge, oil injection time and inlet and exhaust valve opening and closing moment are formed closed-loop control.
The closed-loop control of changeable air valve distribution timing and Injection strategy is paid the utmost attention to the adjustment inlet and exhaust valve opening and closing moment, when exceeding setting range, changes fuel charge and oil injection time. Concrete adjustable strategies is: if in-cylinder pressure and temperature do not reach the inflammability limit under current fuel charge, then ECU1 controls Variable Valve Time mechanism 13, descent of piston was shifted to an earlier date to IO Intake Valve Opens moment during lower, extend the air inlet time length, strengthen the air capacity entering in cylinder, then piston crosses the increase of compression initial pressure after bottom dead center, and cylinder temperature raises. If exceeding the setting range of distribution timing, then ECU1 controls fuel supply device 12, changes fuel charge and oil injection time, ensures fuel concentration in current cylinder between the rare limit of the fuel fire under pressure and temperature and dense limit.
After the auxiliary breaking system normal operation of vehicle of engine negative work circulation, braking deceleration angle value current for vehicle is fed back to ECU1 by wheel brake pressure sensor 6 and vehicle speed sensor 7, ECU1 judges whether the auxiliary braking power of engine reaches necessary requirement, and to Variable Valve Time mechanism 13, the auxiliary braking power of engine is carried out corresponding adjustment by control fuel supply device 12.
Above-described is only embodiment of the present utility model, and in scheme, the general knowledge such as known concrete structure and/or characteristic does not do too much description at this. Should be understood that; for a person skilled in the art, under the prerequisite not departing from the utility model structure, it is also possible to make some distortion and improvement; these also should be considered as protection domain of the present utility model, and these all can not affect effect and the practical applicability that the utility model is implemented. The protection domain that this application claims should be as the criterion with the content of its claim, and the embodiment in specification sheets etc. record the content that may be used for explaining claim.
Claims (7)
1. based on the auxiliary breaking system of vehicle of engine negative work circulation, it is characterised in that, comprise ECU, wheel main brake device brake function test module, described wheel main brake device brake function test module is connected with ECU; Also comprising the auxiliary breaking system cab prompting operation module of engine, described engine auxiliary breaking system cab prompting operation module comprises the wheel main brake device braking ability suggestion device being all connected and the auxiliary drift stop starter gear of engine with ECU; Also comprising the auxiliary breaking system execution module of the engine by ECU control, the auxiliary breaking system execution module of described engine comprises fuel supply device and Variable Valve Time mechanism; Also comprising the engine cylinder combustion condition monitor module of detection engine cylinder combustion situation, described engine cylinder combustion condition monitor module is connected with ECU.
2. the auxiliary breaking system of the vehicle based on the circulation of engine negative work according to claim 1, it is characterised in that: described wheel main brake device brake function test module comprises wheel brake pressure sensor and vehicle speed sensor.
3. the auxiliary breaking system of the vehicle based on the circulation of engine negative work according to claim 1, it is characterised in that: described engine cylinder combustion condition monitor module comprises temperature sensor in engine cylinder pressure sensor and engine cylinder.
4. the auxiliary breaking system of vehicle based on the circulation of engine negative work according to claim 1 or 2 or 3, it is characterized in that: described wheel main brake device braking ability suggestion device is arranged on above panel board, and wheel main brake device braking ability suggestion device comprises red indicating light and yellow indicator lamp.
5. the auxiliary breaking system of the vehicle based on the circulation of engine negative work according to claim 4, it is characterized in that: the oil injection time table that described fuel supply device comprises fuel charge controlling organization and is located on fuel charge controlling organization, described Variable Valve Time mechanism comprises intake and exhaust valve opening and closing timetable.
6. the auxiliary breaking system of the vehicle based on the circulation of engine negative work according to claim 5, it is characterized in that: the auxiliary drift stop of described engine comprises the first switch and the 2nd switch, described first switch, ECU and Variable Valve Time mechanism connect, after described 2nd switch and ECU connect, ECU connects with fuel supply device and Variable Valve Time mechanism more respectively.
7. the auxiliary breaking system of the vehicle based on the circulation of engine negative work according to claim 6, it is characterised in that: described fuel supply device is cylinder injection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620038159.7U CN205315129U (en) | 2016-01-15 | 2016-01-15 | Vehicle auxiliary braking system all based on circulation of engine negative work |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620038159.7U CN205315129U (en) | 2016-01-15 | 2016-01-15 | Vehicle auxiliary braking system all based on circulation of engine negative work |
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| CN205315129U true CN205315129U (en) | 2016-06-15 |
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| CN201620038159.7U Expired - Fee Related CN205315129U (en) | 2016-01-15 | 2016-01-15 | Vehicle auxiliary braking system all based on circulation of engine negative work |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106499510A (en) * | 2016-10-17 | 2017-03-15 | 中国第汽车股份有限公司 | A kind of igniting supercharged engine braking method |
| CN109057975A (en) * | 2018-09-27 | 2018-12-21 | 潍柴动力股份有限公司 | A kind of interior control method and control system braked of engine cylinder |
| CN114013422A (en) * | 2021-10-31 | 2022-02-08 | 东风商用车有限公司 | Auxiliary braking system and method for vehicle-mounted engine and vehicle |
-
2016
- 2016-01-15 CN CN201620038159.7U patent/CN205315129U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106499510A (en) * | 2016-10-17 | 2017-03-15 | 中国第汽车股份有限公司 | A kind of igniting supercharged engine braking method |
| CN109057975A (en) * | 2018-09-27 | 2018-12-21 | 潍柴动力股份有限公司 | A kind of interior control method and control system braked of engine cylinder |
| CN114013422A (en) * | 2021-10-31 | 2022-02-08 | 东风商用车有限公司 | Auxiliary braking system and method for vehicle-mounted engine and vehicle |
| CN114013422B (en) * | 2021-10-31 | 2023-05-30 | 东风商用车有限公司 | Auxiliary braking system and method of vehicle-mounted engine and vehicle |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160615 Termination date: 20170115 |