CN101492051B - Method and system for controlling vehicle - Google Patents
Method and system for controlling vehicle Download PDFInfo
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- CN101492051B CN101492051B CN2009100023515A CN200910002351A CN101492051B CN 101492051 B CN101492051 B CN 101492051B CN 2009100023515 A CN2009100023515 A CN 2009100023515A CN 200910002351 A CN200910002351 A CN 200910002351A CN 101492051 B CN101492051 B CN 101492051B
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- vehicular system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention provides a method and a system for controlling a vehicle. The method comprises the following steps: monitoring a vehicle system; and when a vehicle system failure is monitored and the vehicle is needed to enter a limp state, making the vehicle enter the limp state through exhaust braking. The method and the system can make the vehicle enter the limp state through exhaust braking when detecting that the vehicle system failure can influence any one of the emission performance, the driving performance and the self safety of the vehicle system, and the driving safety of the vehicle. Compared with the prior art, the method and the system can make the vehicle enter the limp state in a more effective mode to further ensure the driving safety of the vehicle, the emission performance of the vehicle, the driving performance of the vehicle, and the self safety of the vehicle more effectively, and improve the usability of the vehicle simultaneously.
Description
Technical field
The present invention relates to vehicle control technique field, relate in particular to a kind of method and system that is used to control vehicle.
Background technique
Diesel engine relies on its good power character, Economy and durability to be used widely on power plant and vehicle from coming out one.Simultaneously, the caused environmental pollution problem of the exhaust emissions of diesel engine for automobile is the problem that vehicle control technique field is paid close attention to always.In the tail gas that vehicle is discharged, mainly comprise particulate material and nitrogen oxide NOx.Particulate material and NOx can be to polluting environment, and especially NOx is bigger for the harm of environment.At present, measures such as the upgrading of the structure and parameter optimization of main optimization by diesel engine emission controls by improving combustion, injection system, firing chamber, fuel oil, exhaust aftertreatment realize the control to exhaust emissions.
In the prior art, can play the better controlled effect to exhaust emissions by above-mentioned these technology, yet, especially when the vehicular discharge control system breaks down, the problem that can exist exhaust emissions to exceed standard still.
In addition, when understanding for other faults of the Security of the Security of the driving of the emission performance that occurs influence Vehicular system at Vehicular system, Vehicular system, Vehicular system self or vehicle drive, how keeping the Security of emission performance, driving or the Security of himself or the vehicle drive of Vehicular system better, also is the problem that related domain is being inquired into always.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method and system that is used to control vehicle, more effectively to control vehicle.
According to an aspect of the present invention, provide a kind of method that is used to control vehicle.This method can comprise: Vehicular system is monitored; And when monitoring the Vehicular system fault and need make vehicle enter the limping state, make vehicle enter the limping state by exhaust brake.
In a mode of execution aspect this according to the present invention, making vehicle enter the limping state by exhaust brake can comprise: according to current engine speed, the activation of control exhaust brake is limited in described predetermined threshold or following with the rotating speed with motor.
In another mode of execution aspect this according to the present invention, the activation of control exhaust brake can comprise: when current engine speed is higher than described predetermined threshold, activate exhaust brake; And when current engine speed is lower than described predetermined threshold, close exhaust brake.
In the another mode of execution aspect this according to the present invention, if the Security of the emission performance of the Vehicular system fault effects Vehicular system that monitors, the driving of Vehicular system, Vehicular system self and the Security of vehicle drive one or more, then need to make vehicle to enter the limping state.
In the mode of execution again aspect this according to the present invention, the fault that influences the Security of the Security of driving, Vehicular system self of emission performance, the Vehicular system of Vehicular system and vehicle drive comprises one or more in the following: failure of fuel system; The after-treatment system fault; The air inlet system and exhaust system fault; And cooling system failure.
In another mode of execution aspect this according to the present invention, predetermined threshold can be provided with according to the demand of the Security of the Security of the driving of the emission performance that guarantees Vehicular system, Vehicular system, Vehicular system self and vehicle drive.
In the another mode of execution aspect this according to the present invention, described method may further include: when monitoring the Vehicular system fault and need make vehicle enter the limping state, to the vehicle user indication information relevant with this Vehicular system fault.
According to a further aspect in the invention, provide a kind of system that is used to control vehicle.This system can comprise: monitoring device is used for Vehicular system is monitored; And the exhaust brake control gear, be used for when monitoring the Vehicular system fault and need make vehicle enter the limping state, making vehicle enter the limping state by exhaust brake.
One preferred embodiment in, described system may further include: indicating device is used for when monitoring the Vehicular system fault and need make vehicle enter the limping state, to the vehicle user indication information relevant with this Vehicular system fault.
By the method according to this invention and system, can be in the Security of the Security of the driving of the emission performance that detects Vehicular system fault effects Vehicular system, Vehicular system, Vehicular system self and vehicle drive any one the time, make vehicle enter the limping state by exhaust brake.With realize the prior art of the state of walking lamely by control fuel injection quantity and jet pressure and compare, the method according to this invention and system can make vehicle enter the limping state with effective means more, and then guaranteed the Security of vehicle drive, the emission performance of vehicle, the driving of vehicle and the Security of vehicle self more effectively, improved the usability of vehicle simultaneously.
Description of drawings
By shown mode of execution in conjunction with the accompanying drawings is elaborated, above-mentioned and other features of the present invention will be more obvious, and identical label is represented same or analogous parts in the accompanying drawing of the present invention.In the accompanying drawings,
Fig. 1 shows the flow chart that is used to control the method for vehicle according to an embodiment of the invention;
Fig. 2 shows the flow chart of method of controlling the rotating speed of motor according to an embodiment of the invention by exhaust brake;
Fig. 3 shows the schematic block diagram of system that is used to control vehicle according to an embodiment of the invention; And
Fig. 4 shows the schematic block diagram of system that is used to control vehicle according to another embodiment of the present invention.
Embodiment
Below with reference to the accompanying drawings, by mode of execution the method and system that is used to control vehicle provided by the invention is described.
At first, will the mode of execution that be used to control the method for vehicle provided by the invention be described referring to figs. 1 to Fig. 2.
Fig. 1 shows the flow chart that is used to control the method for vehicle according to an embodiment of the invention.
As shown in Figure 1, in step 101, Vehicular system is monitored.
To the detection of Vehicular system, can whole Vehicular system be detected at the emission performance of Vehicular system, the driving of Vehicular system, the Security of Vehicular system self and the Security of vehicle drive.
For the emission performance of Vehicular system, can realize detection by some modes to the exhaust emissions of vehicle.
In an embodiment of the invention, can use the detector that is used to detect tail gas to come directly exhaust emissions to be monitored.For example, use NOx sensor that can obtain from the market by commercial sources or particulate matter sensors directly detect the content of nitrogen oxide and particle in the Vehicular exhaust.
In addition, owing to when the vehicular discharge control system breaks down, also can cause emission from vehicles to exceed standard usually,, realize monitoring indirectly to exhaust emissions so can detect by fault to vehicular discharge control system and related system thereof.Vehicular discharge control system and related system thereof mainly comprise oil-fired system, after-treatment system, air inlet system and exhaust system and cooling system, and wherein any one or a plurality of breaking down may cause that all exhaust emissions exceeds standard.Therefore, by to causing in oil-fired system, after-treatment system, air inlet system and exhaust system and the cooling system that critical component that exhaust emissions exceeds standard and associated crucial value monitor, the exhaust emissions of monitor vehicle indirectly.
For oil-fired system, for example the ECU (Electrical Control Unit) of oil sprayer, Injection Pump, fuel gauging unit, control oil-fired system etc. is crucial for the exhaust emissions monitoring.For after-treatment system, it comprises exhaust gas recirculation (Exhaust Gas Recycle, EGR) system, selective reduction (Selective Catalytic Reduction, SCR) system, particulate organic carbon (Particulate Organic Carbon, POC) system, diesel particulate filter (DieselParticulate Filter, DPF) system etc., for the exhaust emissions monitoring, be crucial for example: the EGR valve in the egr system, and the solenoid valve that is used to control the EGR valve with lower member or value; Be used in the SCR system atomize urea urea pump, be used to spray urea urea nozzle, be used to control the ECU (Electrical Control Unit) of the injection of urea; And the delivery temperature of the pressure reduction of DPF system and POC system.For air inlet system and exhaust system, for example monitoring is crucial to pressurized machine for exhaust emissions.For cooling system, for example monitoring is crucial for exhaust emissions for the gas temperature of cooling system discharge and pressure.
Should be appreciated that the driving for Vehicular system, the Security of Vehicular system self or the consideration of vehicle safety, can monitor the miscellaneous part in the Vehicular system similarly.These will all be known for those skilled in the art, therefore in order not obscure the present invention, repeat no more herein.
In addition, need to prove that common same fault may cause multiple potential problem simultaneously.Such as, fault, the rail pressure in the common rail fuel combustion system of the oil sprayer of oil-fired system is too high, the oil mass dosage device fault in the common rail fuel combustion system or intrasystem some temperature or pressure are higher than the upper limit etc., all can relate to the self-security and the emission performance of Vehicular system simultaneously.
For the monitoring of Vehicular system, can utilize monitoring system to realize by designing at the object of the invention.Be equipped with at vehicle under the situation of fault diagnosis system, also can have obtained fault message from existing vehicle breakdown diagnostic system.
Then, in step 102, when monitoring the Vehicular system fault, determine whether to make vehicle to enter the limping state.
In according to one embodiment of present invention, if the Security of the emission performance of the Vehicular system fault effects Vehicular system that monitors, the driving of Vehicular system, Vehicular system self and the Security of vehicle drive one or more, then need to make vehicle to enter the limping state.
For example, utilizing the tail gas detector directly to monitor under the situation of exhaust emissions, resulting checkout value of tail gas detector (for example content of nitrogen oxide) and the reference value of being scheduled to can compared, to determine whether exhaust emissions exceeds standard.For example, when wherein any one surpasses predetermined standard content, determine promptly that the exhaust emissions of vehicle exceeds standard at the amount of nitrogen oxides that detects or particle content.If vehicular discharge exceeds standard, can determine that then Vehicular system fault has taken place and influenced the discharging of Vehicular system, so vehicle need enter the limping state.
In addition, under the situation of the exhaust emissions that comes the indirect monitoring vehicle by the fault that detects emission control systems, can when detecting the emission control systems fault, think that vehicle need enter the limping state.Although as understood by one of ordinary skill in the art, the actual conditions of this moment may be that exhaust emissions does not exceed standard as yet, but the fault of emission control systems finally still can have influence on emission from vehicles, therefore it can be thought vehicular discharge exceeds standard in the present invention, vehicle need enter the limping state.It will be understood by those skilled in the art that according to application demand also can determine whether these faults can cause that vehicular discharge exceeds standard, only when confirming that fault causes that vehicular discharge exceeds standard, think that just vehicle need enter the limping state by further analysis.
Whether influence the standard of the Security of the Security of driving, Vehicular system self of emission performance, the Vehicular system of Vehicular system or vehicle drive about the Vehicular system fault, can demarcate according to the Heuristics of existing knowledge and those skilled in the art in the prior art.
If determine not need Vehicular system is protected in step 102, then this process is back to step 101, continues Vehicular system is monitored; Otherwise this process proceeds to step 103.
In step 103, make vehicle enter the limping state by exhaust brake.
Can control the control of engine speed by exhaust brake, and then make vehicle enter the limping state.Below, will at first the control that realizes in an embodiment of the invention engine speed be described to enter the method for limping state with reference to figure 2.
With reference to figure 2, Fig. 2 shows the flow chart of method of controlling the rotating speed of motor according to an embodiment of the invention by exhaust brake.
In step 201, obtain current engine speed.In existing Vehicular system, the device that is used for the detection of engine rotating speed usually has been equipped with, these information can obtain for the ECU (Electrical Control Unit) that is used to control motor.
In step 202, determine whether current engine speed surpasses predetermined threshold.This predetermined threshold can be provided with according to the demand of the Security of the Security of the driving of the emission performance that guarantees Vehicular system, Vehicular system, Vehicular system self or vehicle drive.This predetermined threshold can be set to when the Security of the Security of the driving of the emission performance of Vehicular system fault effects Vehicular system, Vehicular system, Vehicular system self or vehicle drive, make vehicle to travel safely, simultaneously guarantee the emission performance of Vehicular system, the driving of Vehicular system, the Security of Vehicular system self as much as possible, improved the usability of vehicle simultaneously.
If the engine speed current in step 202 surpasses this predetermined threshold, then this process proceeds to step 203; Otherwise this process proceeds to step 205.
In step 203, determine whether engine exhaust and brake activates, if un-activation still, then this process proceeds to step 204, activates exhaust brake, so that the moment of torsion by the control motor but the rotating speed of motor reduce; Otherwise this process finishes.
In step 205, determine whether exhaust brake activates, if activated exhaust brake, then this process proceeds to step 206, closes exhaust brake; Otherwise this process finishes.
By the method for control engine speed shown in Figure 2, when engine speed is higher than predetermined value, activate exhaust brake, because the moment of torsion of motor is limited at this moment, and then the rotating speed of motor is descended; And drop to predetermined value or when following, close exhaust brake at the rotating speed of motor, motor is turned round under the situation of moment of torsion without limits, thereby realize so-called " limping " working state.
Need to prove that the method for describing with reference to figure 2 can be carried out at interval with preset time above, to guarantee determining that the exceed standard rotating speed of rear engine of tail gas is in predetermined threshold or following basically always.
In another preferred implementation of the present invention, when monitoring the Vehicular system fault and need make vehicle enter the limping state, can also be further to the vehicle user indication information relevant, so that the prompting vehicle user is overhauled vehicle with this Vehicular system fault.This information can be indicated to vehicle user with in sound, light, the electric mode one or more.For example, can be to indicate by the display unit of LED, LCD or the audio devices of loudspeaker.
In addition, according to one embodiment of present invention, when engine speed is lower than predetermined threshold, also can further control moment of torsion by control fuel injection quantity or jet pressure.
By the method according to this invention and system, can be in the Security of the Security of the driving of the emission performance that detects Vehicular system fault effects Vehicular system, Vehicular system, Vehicular system self and vehicle drive any one the time, by exhaust brake vehicle is controlled, make the rotating speed of motor be positioned at predetermined threshold or following, thereby make vehicle enter the limping state.With realize the prior art of the state of walking lamely by control fuel injection quantity and jet pressure and compare, the method according to this invention and system can make vehicle enter the limping state with effective means more, and then guaranteed the Security of vehicle drive, the emission performance of vehicle, the driving of vehicle and the Security of vehicle self more effectively, improved the usability of vehicle simultaneously.
In addition, for non-automatical control system, can't realize the limping state by control fuel injection quantity or jet pressure, and, also can realize the limping state for non-automatical control system by method of the present invention.
Next, will the mode of execution that be used to control the system of vehicle provided by the invention be described with reference to figure 3 and Fig. 4.
Fig. 3 shows the schematic block diagram of system that is used to control vehicle according to an embodiment of the invention.As shown in Figure 3, system 300 of the present invention comprises: monitoring device 310 is used for Vehicular system is monitored; And exhaust brake control gear 320, be used for when monitoring the Vehicular system fault and need make vehicle enter the limping state, making vehicle enter the limping state by exhaust brake.
In an embodiment of the invention, exhaust brake control gear 320 can be configured to according to current engine speed, and the activation of control exhaust brake is limited in described predetermined threshold or following with the rotating speed with motor.Further, when exhaust brake control gear 320 can be higher than described predetermined threshold in current engine speed, activate exhaust brake; And when current engine speed is lower than described predetermined threshold, close exhaust brake.
In another embodiment of the present invention, if the Security of the emission performance of the Vehicular system fault effects Vehicular system that described monitoring device monitors, the driving of Vehicular system, Vehicular system self and the Security of vehicle drive one or more, then need to make vehicle to enter the limping state.Wherein, the fault that influences the Security of the Security of driving, Vehicular system self of emission performance, the Vehicular system of Vehicular system and vehicle drive can comprise one or more in the following: failure of fuel system; The after-treatment system fault; The air inlet system and exhaust system fault; And cooling system failure.
In an embodiment of the invention, this predetermined threshold can be provided with according to the demand of the Security of the Security of the driving of the emission performance that guarantees Vehicular system, Vehicular system, Vehicular system self or vehicle drive.
In addition, Fig. 4 also shows the system's schematic block diagram that is used to control vehicle according to another embodiment of the present invention.As shown in Figure 4, system 400 of the present invention comprises: monitoring device 410, and it is used for Vehicular system is monitored corresponding to the monitoring device among Fig. 3 310; And exhaust brake control gear 420, it is used for making vehicle enter the limping state by exhaust brake when monitoring the Vehicular system fault and need make vehicle enter the limping state corresponding to the exhaust brake control gear 420 among Fig. 3.In addition, different with the described system of Fig. 3 300 is that system 400 further comprises: indicating device 430 is used for when monitoring the Vehicular system fault and need make vehicle enter the limping state, to the vehicle user indication information relevant with this Vehicular system fault.
This indicating device 430 can be installed in any appropriate location that makes things convenient for the user to see, for example in the operator cabin, and can be with in sound, light, the electric mode one or more to vehicle user indication and the emission from vehicles relevant information that exceeds standard.For example, this indicating device 430 can be the form such as the display unit of LED, LCD, also can be the form such as the audio devices of loudspeaker.
About the operation of monitoring device 310,410, exhaust brake control 320,420 and indicating device 430, can be specifically with reference to top description about method of the present invention.
Should be noted that above-described all mode of executions just provide for purposes of illustration, and should not be construed as limitation of the present invention.Can there be some modification in the present invention, for example, can control the rotating speed of motor by oil spout, but when oil-fired system breaks down, controls the rotating speed of motor by activating exhaust brake.In addition, also can control the rotating speed of motor simultaneously by control oil spout and activation exhaust brake.These modification all within the scope of the invention.
In addition, should be noted that in the mode of execution of describing in the above, mode by example is described for the parts and the value of emission detections key, this only is the purpose of property presented for purpose of illustration, and is not to be exhaustive, and therefore the present invention is not limited to this.
In addition, should be noted that in the above in the mode of execution of describing, with the diesel engine be example invention has been described, in fact, the present invention is not limited thereto, the present invention can also be applied to the motor of other types, such as petrol engine.
In addition, need to prove,, it will be appreciated by those skilled in the art that the present invention also can be used for similar devices such as engineering vehicle, engineering machinery although the present invention is described in detail with the form of vehicle.
In addition, should be noted that also embodiments of the present invention can realize with the combination of software, hardware or software and hardware.Hardware components can utilize special logic to realize; Software section can be stored in the storage, and by suitable instruction execution system, for example microprocessor or special designs hardware are carried out.
Though described the present invention, should be appreciated that to the invention is not restricted to disclosed mode of execution with reference to the mode of execution of considering at present.On the contrary, the present invention is intended to contain the interior included various modifications and the equivalent arrangements of spirit and scope of claims.The scope of following claim meets broad interpretation, so that comprise all such modifications and equivalent structure and function.
Claims (2)
1. method that is used to control vehicle comprises:
Vehicular system is monitored;
When monitoring the Vehicular system fault and need make vehicle enter the limping state, make vehicle enter the limping state by exhaust brake; And
When monitoring the Vehicular system fault and need make vehicle enter the limping state, to the vehicle user indication information relevant with this Vehicular system fault,
Wherein, describedly make vehicle enter the limping state by exhaust brake to comprise: come according to current engine speed by following operation, the activation of control exhaust brake, be limited in predetermined threshold or following with rotating speed: when current engine speed is higher than described predetermined threshold, activate exhaust brake with motor; And when current engine speed is lower than described predetermined threshold, close exhaust brake,
Wherein, if the Security of the Security of the driving of the emission performance of the Vehicular system fault effects Vehicular system that monitors, Vehicular system, Vehicular system self and vehicle drive one or more, then need to make vehicle to enter the limping state,
Wherein, the fault of the Security of the Security of the driving of the described emission performance that influences Vehicular system, Vehicular system, Vehicular system self and vehicle drive comprises one or more in the following: failure of fuel system; The after-treatment system fault; The air inlet system and exhaust system fault; And cooling system failure, and
Wherein, described predetermined threshold is provided with according to the demand of the Security of the Security of the driving of the emission performance that guarantees Vehicular system, Vehicular system, Vehicular system self or vehicle drive.
2. system that is used to control vehicle comprises:
Monitoring device is used for Vehicular system is monitored;
The exhaust brake control gear is used for making vehicle enter the limping state by exhaust brake when monitoring the Vehicular system fault and need make vehicle enter the limping state; And
Indicating device is used for when monitoring the Vehicular system fault and need make vehicle enter the limping state, to the vehicle user indication information relevant with this Vehicular system fault,
Wherein, described exhaust brake control gear further configuration is used for: come according to current engine speed by following operation, the activation of control exhaust brake, be limited in predetermined threshold or following with rotating speed: when current engine speed is higher than described predetermined threshold, activate exhaust brake with motor; And when current engine speed is lower than described predetermined threshold, close exhaust brake,
Wherein, if the Security of the emission performance of the Vehicular system fault effects Vehicular system that described monitoring device monitors, the driving of Vehicular system, Vehicular system self and the Security of vehicle drive one or more, then need to make vehicle to enter the limping state
Wherein, the fault of the Security of the Security of the driving of the described emission performance that influences Vehicular system, Vehicular system, Vehicular system self and vehicle drive comprises one or more in the following: failure of fuel system; The after-treatment system fault; The air inlet system and exhaust system fault; And cooling system failure,
Wherein, described predetermined threshold can be provided with according to the demand of the Security of the Security of the driving of the emission performance that guarantees Vehicular system, Vehicular system, Vehicular system self and vehicle drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100023515A CN101492051B (en) | 2009-01-07 | 2009-01-07 | Method and system for controlling vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100023515A CN101492051B (en) | 2009-01-07 | 2009-01-07 | Method and system for controlling vehicle |
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| CN101492051A CN101492051A (en) | 2009-07-29 |
| CN101492051B true CN101492051B (en) | 2011-07-27 |
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| CN2009100023515A Expired - Fee Related CN101492051B (en) | 2009-01-07 | 2009-01-07 | Method and system for controlling vehicle |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9151237B2 (en) * | 2013-06-03 | 2015-10-06 | Electro-Motive Diesel, Inc. | Engine control system for mobile machine |
| US10570834B2 (en) * | 2016-10-27 | 2020-02-25 | Cummins Inc. | Supercharging for improved engine braking and transient performance |
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| EP1234971B1 (en) * | 2001-02-21 | 2006-01-04 | Delphi Technologies, Inc. | Control method for a common rail fuel injection system in case of rail pressure sensor fault |
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| CN201385663Y (en) * | 2009-01-07 | 2010-01-20 | 潍柴动力股份有限公司 | System used for controlling vehicle |
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2009
- 2009-01-07 CN CN2009100023515A patent/CN101492051B/en not_active Expired - Fee Related
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| EP0569227A1 (en) * | 1992-05-08 | 1993-11-10 | Zexel Corporation | Fuel injection control system for internal combustion engine |
| US5629852A (en) * | 1993-02-26 | 1997-05-13 | Mitsubishi Denki Kabushiki Kaisha | Vehicle control device for controlling output power of multi-cylinder engine upon emergency |
| EP1234971B1 (en) * | 2001-02-21 | 2006-01-04 | Delphi Technologies, Inc. | Control method for a common rail fuel injection system in case of rail pressure sensor fault |
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