CN103742273A - Testing system for obtaining EVB (Exhaust Valve Brake) system performance and control strategy thereof - Google Patents
Testing system for obtaining EVB (Exhaust Valve Brake) system performance and control strategy thereof Download PDFInfo
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- CN103742273A CN103742273A CN201310728068.7A CN201310728068A CN103742273A CN 103742273 A CN103742273 A CN 103742273A CN 201310728068 A CN201310728068 A CN 201310728068A CN 103742273 A CN103742273 A CN 103742273A
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Abstract
The invention discloses a testing system for obtaining EVB (Exhaust Valve Brake) system performance and a control strategy thereof. The control strategy of the testing system for obtaining the EVB system performance particularly comprises firstly electrifying an ECU (Electronic Control Unit) of a vehicle and turning on an EVB system control switch under the state that an engine is not started; then controlling a butterfly throttle valve in the EVB system to be in an opening working state or a closing working state and detecting valve element motion signals of the butterfly throttle valve; finally judging whether a valve element satisfies a normal opening or closing condition according to the valve element opening and closing signals, sending a control command that the valve element is normally opened or closed if satisfies and sending a control command that the valve element is abnormally opened or abnormally closed if not. The control strategy of the testing system for obtaining the EVB system performance has the advantages of measuring the opening angles when the butterfly throttle valve is at different working states under the condition that the electric engine of the ECU is not started, accordingly achieving the purpose of judging whether the valve element can normally work or not, guaranteeing life safety of drivers and reducing engine power sudden reduction impact to the drivers, the engine and the like when the butterfly throttle valve brakes during driving detection.
Description
Technical field
The present invention relates to vehicle brake technology field, particularly for obtaining test system and the control strategy thereof of EVB systematic function.
Background technique
Air exhaust valve brake system (exhaust valve brake, hereinafter to be referred as EVB) is a kind of complemental brake system, belongs to slowing down speed of engine, and it reaches the object of the braking effect of further raising motor take traditional fly valve air exhaust valve brake system as basis.
EVB comprises fly valve auxiliary exhaust braking device and the diesel exhaust gas gate control two large divisions of actuator, and both are interrelated, uses simultaneously.EVB braking is to be based upon on traditional butterfly throttle valve auxiliary exhaust braking device basis, fly valve is arranged on waste pipe road, when EVB brakes, butterfly throttle valve cuts out, diesel engine is similar to compressor operating under the dragging of automobile gravity, exhaust gas pressure in exhaust passage sharply rises, and the pressure wave that the exhaust of adjacent cylinder produces can cause near the exhaust valve of cylinder suction stroke lower dead center to be opened uncontrollably.EVB is exactly the phenomenon of utilizing exhaust valve automatically to be opened by pressure wave in braking process, by increasing the actuator of a set of control exhaust valve travel, realizes exhaust valve and in engine braking process, stay open a space and improve the retardation efficiency of motor.
EVB can guarantee the frequency of usage of vehicle in downhill path, mountain area driving safety, reduction brake system, alleviates the degree of wear of braking system, extends the replacement cycle of brake shoe; When the while after the rain or ice and snow road meets urgency, use exhaust brake can also prevent that vehicle is because of the too fast defective steering stabilizer phenomenon causing of slowing down.Although EVB braking can not be by vehicle emergency stop, can reach the object that vehicle stabilization is slowed down.
But, current can only be when engine operation, just can detect that in EVB, can butterfly throttle valve normally work, that is to say, in prior art, only in Vehicle Driving Cycle process, when driver uses EVB braking, according to the situation of braking, could judge whether EVB normally works.If now butterfly throttle valve cisco unity malfunction in EVB, EVB just cannot normally brake, and the automobile storage in exercising is like this in very large potential safety hazard.
Therefore, can how at motor, in off working state, understand in EVB butterfly throttle valve normal brake application work, is those skilled in that art's technical problems urgently to be resolved hurrily.
Summary of the invention
Object of the present invention in order to provide, a kind of for obtaining test system and the control strategy thereof of EVB systematic function, can realize in not startup of motor situation by this control strategy, judges whether butterfly throttle valve can normally work.
For solving the problems of the technologies described above, the invention provides a kind ofly for obtaining the control strategy of EVB systematic function, concrete control strategy is:
S1, vehicle ECU power on, and connect EVB system control switch not opening under engine condition;
S2, control in described EVB system butterfly throttle valve in opening working state or closing working state, and detect the spool actuating signal of described butterfly throttle valve;
S3, according to described switching spool signal, judge that whether described spool meets the condition of normally opening or closing, if satisfied condition, performs step S32; Otherwise, execution step S31;
S31, send the control command that spool is normally opened or closed;
S32, send spool unauthorised opening or improper control command of closing.
Preferably, in step S1, after described ECU powers on, first automatically make the following judgment:
S11, judgement are last to be connected the current time difference of EVB system control switch distance not opening under engine condition, if the described time difference is less than or equal to predefined value, performs step S14; Otherwise, and perform step S12;
S12, ECU send the control command of connecting EVB system control switch;
S14, ECU send without the control command detecting.
Preferably, also comprise the first display unit, in step S11, in described ECU execution step S14, also carry out following steps:
S20, send the control command in the first state by described the first display unit;
In step S11, in execution step S12, also carry out following steps:
S21, send the control command in the second state by described the first display unit.
Preferably, after execution step S12, before entering step S2, also make the following judgment:
S13, judge whether motor is opened, whether EVB system control switch open; If described motor is not opened, described EVB system control switch is opened, and enters step S2; Otherwise, execution step S15;
S15, prompting make mistakes, and return to execution step S13.
Preferably, also comprise the second display unit, when execution in step S13 enters step S2, also carry out:
S22, send the control command in the first state by described the second display unit;
When performing step S15 in step S13, also carry out:
S23, the control command by described the second display unit in the second state.
Preferably, also comprise warning piece, after described step S32, also carry out following steps:
S33, receive described spool unauthorised opening or improper control command of closing, and according to described control command and send alarm signal.
Preferably, also comprise actuator, described actuator comprises inflator and swing arm, the telescopic end of described inflator connects the rotating shaft of described butterfly throttle valve by described swing arm, when described inflator is positioned at the first working position and the second working position, described spool is respectively in opening working state and closing working state.
Preferably, described in to obtain parts be angle transducer, described angle transducer is located at the rotating shaft of described butterfly throttle valve.
Provided by the present invention for obtain the control strategy of EVB systematic function can be only in the situation that ECU obtains electric engine and does not start, measure the open angle of butterfly throttle valve in different operating state, thereby realize, judge the object that can spool normally work, with only can be after engine start Vehicle Driving Cycle in prior art, while using EVB Braking system, just can learn that can butterfly throttle valve normally work and compare, this control strategy provided by the present invention has improved the driving safety of vehicle, has ensured the life safety of driver.
Meanwhile, when while also having reduced driving, in EVB system, butterfly throttle valve is braked, the impact that engine power declines to driver and motor etc. suddenly, improves the travelling comfort checking, plays in advance the effect of finding, rectify and improve, preventing simultaneously.
In addition, it is a kind of for obtaining the test system of EVB systematic function that the present invention also provides, the actuator that comprises butterfly throttle valve and drive described butterfly throttle valve to open or close, comprise and obtain parts, for obtaining the spool actuating signal of EVB system butterfly throttle valve, and in vehicle ECU, be provided with judging unit, described judging unit receives described spool actuating signal and calculates the spool aperture of described butterfly throttle valve.
Preferably, described in to obtain parts be angle transducer, described angle transducer is located at the rotating shaft of described butterfly throttle valve.
Because above-mentioned control strategy is to implement on the basis of this test system, therefore test system provided by the present invention also has the beneficial effect of above-mentioned control strategy.
Accompanying drawing explanation
Fig. 1 be in an embodiment of the present invention for obtain EVB systematic function the flow chart of control strategy;
Fig. 2 is for obtaining the flow chart of control strategy of EVB systematic function in a kind of preferred embodiment of the present invention;
Fig. 3 is that the butterfly throttle valve of EVB system in an embodiment of the present invention is in the structural representation of complete opening state;
Fig. 4 is the side view of test system shown in Fig. 3;
Fig. 5 is that the butterfly throttle valve of test system in an embodiment of the present invention is in the structural representation of buttoned-up status;
Fig. 6 is the side view of test system shown in Fig. 5.
Wherein, in Fig. 3 to Fig. 6, the one-to-one relationship between reference character and component names is as follows:
1 outlet pipe, 2 inflators, 3 piston rods, 4 swing arms, 5 angle transducers, 6 spools, 7 rotating shafts.
Embodiment
Core of the present invention in order to provide, a kind of for obtaining test system and the control strategy thereof of EVB systematic function, can realize in not startup of motor situation by this control strategy, judges whether butterfly throttle valve can normally work.
In order to make those skilled in the art understand better technological scheme of the present invention, below in conjunction with system, control strategy, the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, Fig. 1 is for obtaining the flow chart of control strategy of EVB systematic function in an embodiment of the present invention.
The invention provides a kind of for obtaining the test system of EVB systematic function, comprise and obtain parts, for obtaining spool 6 actuating signals of EVB butterfly throttle valve, obtaining parts can be angle detecting switch, detect the rotation angle of butterfly sheet or butterfly sheet rotating shaft 7, also can be the detecting switch of other pattern, and be provided with judging unit in vehicle ECU, judging unit receives spool 6 actuating signals and calculates spool 6 apertures of butterfly throttle valve, operator can weigh and judge that butterfly throttle valve is whether in normal unlatching or the working state of normally cutting out according to spool 6 apertures of calculating gained, usually, butterfly sheet throttle valve has two working staties: open working state and close working state, opening working state requires butterfly throttle valve to open completely, closing working state requires butterfly throttle valve to close completely, therefore, operator can be placed in butterfly throttle valve and open working state and close working state, whether observe respectively spool 6 angles of the butterfly throttle valve of ECU calculating gained opens completely or closes completely, certainly, for special circumstances, butterfly throttle valve is when open mode, and its spool 6 also can be set to open certain angle.Concrete control strategy is as follows:
S1, vehicle ECU power on, and connect EVB system control switch not opening under engine condition;
S2, control in described EVB system butterfly throttle valve in opening working state or closing working state, and detect spool 6 actuating signals of described butterfly throttle valve; Usually, butterfly throttle valve is arranged on waste pipe 1, and for multicylinder engine, butterfly throttle valve is arranged on exhaust manifold;
S3, according to described spool 6 switching signals, judge that whether described spool 6 meets the condition of normally opening or closing, if satisfied condition, performs step S32; Otherwise, execution step S31;
S31, send the control command that spool 6 is normally opened or closed;
S32, send spool 6 unauthorised openings or improper control command of closing.
Control strategy provided by the present invention can be only in the situation that ECU obtains electric engine and does not start, measure the open angle of butterfly throttle valve in different operating state, thereby realize, judge the object that can spool 6 normally work, with only can be after engine start Vehicle Driving Cycle in prior art, while using EVB Braking system, just can learn that can butterfly throttle valve normally work and compare, this control strategy provided by the present invention has improved the driving safety of vehicle, has ensured the life safety of driver.
Meanwhile, when while also having reduced driving, in EVB system, butterfly throttle valve is braked, the impact that engine power declines to driver and motor etc. suddenly, improves the travelling comfort checking, plays in advance the effect of finding, rectify and improve, preventing simultaneously.
Please refer to Fig. 2, Fig. 2 is for obtaining the flow chart of control strategy of EVB systematic function in a kind of preferred embodiment of the present invention.
One preferred embodiment in, in above-mentioned steps S1, after ECU powers on, open before EVB system control switch, automatically make the following judgment:
S11, judgement are last to be connected the current time difference of EVB system control switch distance not opening under engine condition, if the described time difference is less than or equal to predefined value, performs step S14; Otherwise, and perform step S12;
S12, ECU send the control command of connecting EVB system control switch;
S14, ECU send without the control command detecting.
The time difference of detecting can be according to system needs, and operator rationally arrange, and avoid the phenomenon that a unlatching ECU system just detects to occur, and can improve like this working efficiency of vehicle operation.
Above-mentioned ECU control command can show by the display unit arranging, thereby operator can be according to the demonstration of display unit, learn and whether detect, the first display unit is for example set, also comprise the first display unit, in step S11, in described ECU execution step S14, also send the control command in the first state by described the first display unit; In the time of execution step S12, also send the control command in the second state by described the first display unit; Take the first display unit as tutorial light, be example, when ECU judges the time difference, be less than or equal to predefined value, tutorial light receives the control command without detection that ECU sends, the now state of tutorial light in not working; When tutorial light receives the control command of the connection EVB system control switch that sends of ECU, tutorial light is in lighting lamp state.Below concrete steps reference:
In above-mentioned steps S11, in described ECU execution step S14, also carry out following steps:
S20, send the control command that tutorial light does not work;
In step S11, in execution step S12, also carry out following steps:
S21, send the bright control command of tutorial light.
Certainly, display unit is not limited to above-mentioned tutorial light, can be also other vision component or sound components, and for example, the tutorial light of multiple color shows respectively different control commands, or the parts such as alarm bell.
Further, after execution step S12, before entering step S2, also make the following judgment:
S13, judge whether motor is opened, whether EVB system control switch open; If motor is not opened, described EVB system control switch is opened, and enters step S2; Otherwise prompting makes mistakes, and again perform step S12.
Like this, when system detection is broken down, be conducive to seeking system failure cause.
Work as combustion, can further include the second display unit in system, also comprise the second display unit, when execution in step S13 enters step S2, described ECU also sends the control command in the first state by described the second display unit; In the time of execution step S15, described ECU also sends the control command in the second state by described the second display unit.In like manner, the second display unit and the first display unit are similar, can be the visual cues devices such as tutorial light, can be also the auditory cues devices such as alarm bell.Concrete steps are as follows:
When execution in step S13 enters step S2, also carry out:
S2, send the control command in the first state by described the second display unit;
When performing step S15 in step S13, also carry out:
S23, the control command by described the second display unit in the second state.
Take the second display unit as tutorial light, be example, when described motor is not opened, described EVB system control switch is opened, and ECU sends tutorial light in the go out control command of state of lamp; When described motor, do not open and open both with described EVB system control switch and have one not satisfy condition; ECU sends the control command of tutorial light in lighting lamp state.
In the various embodiments described above, test system also comprises warning piece, also carries out following steps after described step S32:
S33, receive described spool unauthorised opening or improper control command of closing, and according to described control command and send alarm signal; Like this, when butterfly throttle valve can not normally open or cut out, warning piece can remind vehicle operator in time EVB system to be safeguarded.
Please refer to Fig. 3 to Fig. 6, Fig. 3 be in an embodiment of the present invention for the test system butterfly throttle valve that obtains EVB systematic function the structural representation in complete opening state; Fig. 4 is the side view of test system shown in Fig. 3; Fig. 5 is that the butterfly throttle valve of test system in an embodiment of the present invention is in the structural representation of buttoned-up status; Fig. 6 is the side view of test system shown in Fig. 5.
EVB system in the various embodiments described above can also comprise actuator, actuator comprises inflator 2 and swing arm 4, the telescopic end of inflator 2 connects the rotating shaft 7 of butterfly throttle valve by swing arm 4, when inflator 2 is positioned at the first working position and the second working position, spool 6 is respectively in opening working state and closing working state.Take Fig. 3 as example, the piston rod 3 that connects piston in inflator 2 connects swing arm 4.
The power resources of inflator 2 can be the pressurized air bag of vehicle set; In certain EVB system, the actuator of butterfly throttle valve is including, but not limited to foregoing description.
In the various embodiments described above, obtaining parts can be angle transducer 5, and angle transducer 5 is located at the rotating shaft 7 of butterfly throttle valve; This set-up mode is fairly simple, and without occupying too large space, measures reliable.
To provided by the present invention, for the test system and the control strategy thereof that obtain EVB systematic function, be described in detail above.Applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. for obtaining a control strategy for EVB systematic function, it is characterized in that, concrete control strategy is:
S1, vehicle ECU power on, and connect EVB system control switch not opening under engine condition;
S2, control in described EVB system butterfly throttle valve in opening working state or closing working state, and detect the spool actuating signal of described butterfly throttle valve;
S3, according to described switching spool signal, judge that whether described spool meets the condition of normally opening or closing, if satisfied condition, performs step S32; Otherwise, execution step S31;
S31, send the control command that spool is normally opened or closed;
S32, send spool unauthorised opening or improper control command of closing.
2. control strategy as claimed in claim 1, is characterized in that, in step S1, after described ECU powers on, first automatically makes the following judgment:
S11, judgement are last to be connected the current time difference of EVB system control switch distance not opening under engine condition, if the described time difference is less than or equal to predefined value, performs step S14; Otherwise, and perform step S12;
S12, ECU send the control command of connecting EVB system control switch;
S14, ECU send without the control command detecting.
3. control strategy as claimed in claim 2, is characterized in that, also comprises the first display unit, in step S11, in described ECU execution step S14, also carries out following steps:
S20, send the control command in the first state by described the first display unit;
In step S11, in execution step S12, also carry out following steps:
S21, send the control command in the second state by described the first display unit.
4. control strategy as claimed in claim 2, is characterized in that, after execution step S12, before entering step S2, also makes the following judgment:
S13, judge whether motor is opened, whether EVB system control switch open; If described motor is not opened, described EVB system control switch is opened, and enters step S2; Otherwise, execution step S15;
S15, prompting make mistakes, and return to execution step S13.
5. control strategy as claimed in claim 4, is characterized in that, also comprises the second display unit, when execution in step S13 enters step S2, also carries out:
S22, send the control command in the first state by described the second display unit;
When performing step S15 in step S13, also carry out:
S23, the control command by described the second display unit in the second state.
6. control strategy as claimed in claim 1, is characterized in that, also comprises warning piece, also carries out following steps after described step S32:
S33, receive described spool unauthorised opening or improper control command of closing, and according to described control command and send alarm signal.
7. control strategy as claimed in claim 1, it is characterized in that, also comprise actuator, described actuator comprises inflator and swing arm, the telescopic end of described inflator connects the rotating shaft of described butterfly throttle valve by described swing arm, when described inflator is positioned at the first working position and the second working position, described spool is respectively in opening working state and closing working state.
8. the control strategy as described in claim 1 to 7 any one, is characterized in that, described in to obtain parts be angle transducer, described angle transducer is located at the rotating shaft of described butterfly throttle valve.
9. one kind for obtaining the test system of EVB systematic function, the actuator that comprises butterfly throttle valve and drive described butterfly throttle valve to open or close, it is characterized in that, comprise and obtain parts, for obtaining the spool actuating signal of EVB system butterfly throttle valve, and in vehicle ECU, be provided with judging unit, described judging unit receives described spool actuating signal and calculates the spool aperture of described butterfly throttle valve.
10. test system as claimed in claim 9, is characterized in that, described in to obtain parts be angle transducer, described angle transducer is located at the rotating shaft of described butterfly throttle valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310728068.7A CN103742273A (en) | 2013-12-24 | 2013-12-24 | Testing system for obtaining EVB (Exhaust Valve Brake) system performance and control strategy thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310728068.7A CN103742273A (en) | 2013-12-24 | 2013-12-24 | Testing system for obtaining EVB (Exhaust Valve Brake) system performance and control strategy thereof |
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| CN103742273A true CN103742273A (en) | 2014-04-23 |
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| CN201310728068.7A Pending CN103742273A (en) | 2013-12-24 | 2013-12-24 | Testing system for obtaining EVB (Exhaust Valve Brake) system performance and control strategy thereof |
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Cited By (1)
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| CN112154263A (en) * | 2018-02-28 | 2020-12-29 | 博世株式会社 | ECU and exhaust brake control device |
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Application publication date: 20140423 |