CN103075286A - Method and device for detecting fault of high-pressure oil pump incapable of establishing low rail pressure - Google Patents
Method and device for detecting fault of high-pressure oil pump incapable of establishing low rail pressure Download PDFInfo
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- CN103075286A CN103075286A CN2012105831110A CN201210583111A CN103075286A CN 103075286 A CN103075286 A CN 103075286A CN 2012105831110 A CN2012105831110 A CN 2012105831110A CN 201210583111 A CN201210583111 A CN 201210583111A CN 103075286 A CN103075286 A CN 103075286A
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Abstract
The invention discloses a method and a device for detecting a fault of a high-pressure oil pump incapable of establishing a low rail pressure. The method comprises the following steps: when a controlled practical fuel oil flow flowing into the high-pressure oil pump is the minimum flow, detecting a first practical rail pressure of a common-rail pipe; if the first practical rail pressure is constantly higher than a preset rail pressure and a theoretical oil supply volume is less than or equal to a minimum threshold value, detecting a practical current of an oil volume metering unit; if a difference value between the practical current and a preset current is out of a preset range, confirming a driving circuit or wire harness fault of the oil volume metering unit; if the difference value between the practical current and the preset current is within the preset range, controlling the oil volume metering unit so as to set duty cycle and operate, detecting a second practical rail pressure of the common-rail pipe, and setting the duty cycle as the maximum duty cycle adding a preset offset; if the range amplitude of the second practical rail pressure is not less than the preset threshold value, confirming the oil volume metering unit being in characteristic drifting fault; and if the range amplitude of the second practical rail pressure is less than the preset threshold value, confirming the high-pressure oil pump being in mechanical fault.
Description
Technical field
The present invention relates to the detection technique field, relate in particular to fault detection method and device that a kind of high pressure oil pump can't be set up low rail pressure.
Background technique
Referring to high pressure co-rail system schematic diagram shown in Figure 1, high pressure co-rail system mainly comprises: high pressure oil pump, common rail pipe, pressure-limit valve and oil sprayer etc., its working principle is as follows, utilize low pressure fuel pump with sucking-off in the fuel from fuel tank, pressurize through offering high pressure oil pump after filtering, after fuel oil is pressurized to needed pressure, be sent to common rail pipe; Common rail pipe has two fuel inlet fittings, be connected with high pressure oil pump by two high-pressure oil pipes at the fuel inlet fitting place, high pressure oil pump adopts the double plunger pump structure, two plunger pumps alternately are the common rail pipe fuel feeding according to certain rule, 6 excess-flow valves also are installed on the common rail pipe, be connected with 6 oil sprayers respectively by high-pressure oil pipe, in addition, a pressure transducer and pressure-limit valve also are installed, pressure transducer is used for obtaining the pressure signal of common rail pipe, pressure-limit valve is used for rapidly the fuel oil in the common rail pipe being carried out earial drainage when pressure anomaly appears in common rail pipe, thereby discharges the pressure in the common rail pipe.Common rail pipe is in fact a high-pressure bottle, plays the storage high pressure fuel, and high pressure fuel is distributed to each oil sprayer by high-pressure oil pipe, plays simultaneously the effect that reduces oil sprayer open and close and the caused pressure surge of high pressure oil pump fuel feeding.
Structured flowchart referring to shown in Figure 2 two closed loop rail pressure control system, according to current working rail pressure (the common rail pipe pressure of high pressure co-rail system) is carried out feedforward control and can obtain the required fuel delivery of high pressure oil pump, and the difference of utilizing the actual rail pressure of current setting rail pressure and sensor feedback carries out PID control and regulates with the fuel delivery that described feedforward control is obtained, thereby obtains the required theoretical fuel delivery of current high pressure oil pump; The fuel gauging unit is the proportional electromagnetic valve that control enters high pressure oil pump import fuel flow, according to fuel gauging element characteristics curve shown in Figure 3 as can be known, along with the electric current increase of fuel gauging unit, the oil mass that enters high pressure oil pump will reduce, in addition, because electric current is proportional to dutycycle, dutycycle characterizes the time scale that described fuel gauging units alternately opens and closes, and dutycycle is larger, and the time that the fuel gauging units alternately is opened is shorter, the oil mass that enters high pressure oil pump is less, and vice versa; Can obtain according to calibration curve shown in Figure 3 the setting electric current of fuel gauging unit corresponding to described theoretical fuel delivery, and be corresponding dutycycle with described setting current conversion, actual current by obtaining described fuel gauging unit and the difference of described setting electric current are carried out closed loop control to electric current simultaneously, to obtain correction factor so that the dutycycle after the conversion is revised, thereby utilize the opening and closing time of revised Duty ratio control fuel gauging unit, thereby control enters the fuel flow of high pressure oil pump import.The fuel oil of high pressure oil pump enters common rail pipe through high-pressure oil pipe, and amount of fuel is more, and common rail pipe pressure (rail pressure) is larger.
In the prior art, when needs are set up low rail pressure and adopt shown in Figure 2 two closed loop rail pressure control system, if detecting actual rail pressure continues greater than setting rail pressure, then determine whether to enter the theoretical fuel delivery of high pressure oil pump less than or equal to minimum value in two closed loop rail pressure control systems, if be less than or equal to, then can only determine that by this detecting method high pressure oil pump can't set up low rail pressure, but can't determine to set up in this situation the failure cause of low rail pressure.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of high pressure oil pump can't set up fault detection method and the device of low rail pressure, continuing in actual rail pressure when setting rail pressure and theoretical fuel delivery and be less than or equal to minimum value, determine that high pressure oil pump can't set up the failure cause of low rail pressure.
To achieve these goals, the invention provides the fault detection method that a kind of high pressure oil pump can't be set up low rail pressure, comprising:
In two closed loop rail pressure control system, when the actual fuel flow that utilizes the fuel gauging unit controls to flow into high pressure oil pump during for minimum discharge, detect the first actual rail pressure of common rail pipe, described pair of closed loop rail pressure control system adopts rail pressure outer shroud feedback control and current inner loop feedback control;
If the described first actual rail pressure perseverance judges then greater than setting rail pressure whether the theoretical fuel delivery of fuel gauging unit in the described pair of closed loop rail pressure control system is less than or equal to minimum threshold;
If described theoretical fuel delivery is less than or equal to minimum threshold, then detect the actual current of described fuel gauging unit;
If the difference of described actual current and setting electric current not in setting range, determines then that drive circuit or the wire harness of described fuel gauging unit breaks down;
If the difference of described actual current and setting electric current is in setting range, then control described fuel gauging unit to set dutycycle work, and detect the second actual rail pressure of described common rail pipe, described setting dutycycle is that maximum duty cycle adds the setting side-play amount, and the fuel flow that described setting dutycycle and described fuel gauging unit controls enter high pressure oil pump is inversely proportional to;
If the amplitude of variation of described the second actual rail pressure is not less than setting threshold, determine that then the characteristic drift fault appears in described fuel gauging unit;
There was a mechanical failure if the amplitude of variation of described the second actual rail pressure, is then determined described high pressure oil pump less than setting threshold.
Preferably, in said method, if described theoretical fuel delivery, determines then that rail pressure outer shroud control problem appears in described pair of closed loop rail pressure control system greater than minimum threshold.
Preferably, in said method, described mechanical failure comprises: the slit greatly when described fuel gauging unit was closed or the zero oil mass hole of high pressure oil pump is too small or obstruction.
Preferably, said method also comprises:
If drive circuit or the wire harness of described fuel gauging unit break down, then send the first alarm signal;
If the characteristic drift fault appears in described fuel gauging unit, then send the second alarm signal;
If there was a mechanical failure for described high pressure oil pump, then send the 3rd alarm signal;
If rail pressure outer shroud control problem appears in described double closed-loop control system, then send the 4th alarm signal.
Preferably, in said method, adopts pressure sensor detects the first actual rail pressure or the second actual rail pressure of described common rail pipe.
The present invention also provides a kind of high pressure oil pump can't set up the Fail detecting apparatus of low rail pressure, comprising:
The first detection unit, be used in two closed loop rail pressure control system, when the actual fuel flow that utilizes the fuel gauging unit controls to flow into high pressure oil pump during for minimum discharge, detect the first actual rail pressure of common rail pipe, described pair of closed loop rail pressure control system adopts rail pressure outer shroud feedback control and current inner loop feedback control;
The first judging unit is used for judging whether the described first actual rail pressure is permanent in setting rail pressure;
The second judging unit is used for the described first actual rail pressure perseverance of obtaining in described the first judgment unit judges when setting rail pressure, judges that whether the theoretical fuel delivery of fuel gauging unit in the described pair of closed loop rail pressure control system is less than or equal to minimum threshold;
The second detection unit when being used for the described theoretical fuel delivery that obtains in described the second judgment unit judges less than or equal to minimum threshold, detects the actual current of described fuel gauging unit;
The 3rd judging unit is used for judging that described actual current and the difference of setting electric current are whether in setting range;
The first determining unit is used for the described actual current that obtains in described the 3rd judgment unit judges and not in setting range the time, determines that drive circuit or the wire harness of described fuel gauging unit breaks down with the difference of setting electric current;
Control unit, be used for the described actual current that obtains in described the 3rd judgment unit judges with the difference of setting electric current in setting range the time, control described fuel gauging unit to set dutycycle work, described setting dutycycle is that maximum duty cycle adds the setting side-play amount, and the fuel flow that described setting dutycycle and described fuel gauging unit controls enter high pressure oil pump is inversely proportional to;
Described the first detection unit also is used for controlling described fuel gauging unit with after setting dutycycle work at described control unit, detects the second actual rail pressure of described common rail pipe;
The 4th judging unit is used for judging that whether the amplitude of variation of described the second actual rail pressure is less than setting threshold;
The second determining unit when the amplitude of variation that is used for described the second actual rail pressure of obtaining in described the 4th judgment unit judges is not less than setting threshold, determines that the characteristic drift fault appears in described fuel gauging unit;
The 3rd determining unit, the amplitude of variation that is used for described the second actual rail pressure of obtaining in described the 4th judgment unit judges are during less than setting threshold, and there was a mechanical failure to determine described high pressure oil pump.
Preferably, said apparatus also comprises:
The 4th determining unit when being used for the described theoretical fuel delivery that obtains in described the second judgment unit judges greater than minimum threshold, determines that rail pressure outer shroud control problem appears in described pair of closed loop rail pressure control system.
Preferably, in said apparatus, described mechanical failure comprises: the slit greatly when described fuel gauging unit was closed or the zero oil mass hole of high pressure oil pump is too small or obstruction.
Preferably, said apparatus also comprises:
The first transmitting element is used for then sending the first alarm signal when the drive circuit of the described fuel gauging unit that described the first determining unit is determined or wire harness break down;
The second transmitting element when the characteristic drift fault occurring for the described fuel gauging unit of determining in described the second determining unit, then sends the second alarm signal;
The 3rd transmitting element when there was a mechanical failure for the described high pressure oil pump of determining in described the 3rd determining unit, then sends the 3rd alarm signal;
The 4th transmitting element is used for then sending the 4th alarm signal when rail pressure outer shroud control problem appears in the described double closed-loop control system that described the 4th determining unit is determined.
Preferably, in said apparatus, described the first detection unit specifically is used for the first actual rail pressure or the second actual rail pressure that adopts pressure sensor detects described common rail pipe.
As seen, high pressure oil pump of the present invention can't be set up fault detection method and the device of low rail pressure, under the unloaded idling operation of motor, if rail pressure is in closed loop control, and actual rail pressure continues bigger than normal and theoretical fuel delivery less than or equal to minimum value, then can get rid of rail pressure outer shroud control problem; If the current closed-loop error in the reasonable scope, then get rid of fuel gauging unit hardware circuit and wire harness problem; Utilize the open loop diverter switch to set the open loop dutycycle and add side-play amount for maximum duty cycle, get rid of fuel gauging element characteristics drifting problem if actual rail pressure amplitude of variation is less, above three kinds of reasons all are excluded can be confirmed as the high pressure oil pump mechanical reason and cause setting up low rail pressure, is generally high pressure oil pump zero oil mass hole too small or stop up.As seen, the present invention can accurately distinguish the fault mode that can't set up low rail pressure, thereby is convenient to the eliminating of fault.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technological scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the high pressure co-rail system schematic diagram;
Fig. 2 is the structured flowchart of two closed loop rail pressure control systems;
Fig. 3 is fuel gauging element characteristics plotted curve;
Fig. 4 is the schematic flow sheet that high pressure oil pump of the present invention can't be set up the fault detection method of low rail pressure;
Fig. 5 is the structural representation that high pressure oil pump of the present invention can't be set up the Fail detecting apparatus of low rail pressure.
Embodiment
For the purpose, technological scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technological scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment who obtains under the creative work prerequisite.
In which kind of situation, need to set up low rail pressure under the paper:
Motor is when the slow-speed of revolution or low-load, and the required fuel injection quantity of oil sprayer is less, need utilize this moment high pressure oil pump to set up lower common rail pipe pressure (low rail pressure), when common rail pipe pressure is low, can controls more accurately oil sprayer and carry out oil spout.Because when the required fuel injection quantity of oil sprayer is less, if the pressure in the common rail pipe is larger, then common rail pipe discharge moment fuel injection quantity will be larger, for the difficulty control of required low fuel injection quantity, so need to utilize this moment high pressure oil pump to set up low rail pressure, flow into amount of fuel in the common rail pipe by high pressure oil pump and reduce pressure in the common rail pipe by reducing.
Referring to shown in Figure 4, Fig. 4 is the schematic flow sheet that a kind of high pressure oil pump provided by the invention can't be set up the fault detection method of low rail pressure, realizes that the step of the method is as follows:
S401: in two closed loop rail pressure control system, when the actual fuel flow that utilizes the fuel gauging unit controls to flow into high pressure oil pump during for minimum discharge, detect the first actual rail pressure of common rail pipe.
Described pair of closed loop rail pressure control system is block diagram shown in Figure 2, and this pair closed loop rail pressure control system adopts rail pressure outer shroud feedback control and current inner loop feedback control.
Described fuel gauging unit is the proportional electromagnetic valve that control enters high pressure oil pump import fuel flow, fuel gauging unit controls characteristic as shown in Figure 3, it is in the nature electromagnetic proportional valve, these valve characteristics are for reducing along with electric current increases fuel delivery, and electric current is proportional to dutycycle, therefore the larger fuel delivery of dutycycle is less, and the characteristic of fuel gauging unit itself can be drifted about along with service time.
Can utilize pressure transducer to detect high pressure co-rail system common rail pipe pressure, to obtain the first actual rail pressure of common rail pipe.
S402: if the first actual rail pressure perseverance of described common rail pipe is greater than setting rail pressure, whether the theoretical fuel delivery of then judging fuel gauging unit in the described pair of closed loop rail pressure control system is less than or equal to minimum threshold, if so, and execution in step S403 then, if not, execution in step S410 then.
Illustrate, if the setting rail pressure under the current working (the low rail pressure of the common rail pipe that this setting rail pressure is the required foundation of system) is 10MPa, but after shown in Figure 2 two closed loop rail pressure control system regulates, the first actual rail pressure of common rail pipe continues greater than setting rail pressure, do not set the rail pressure place and drop to, currently as can be known can't set up required low rail pressure, should detect the reason that can't set up low rail pressure this moment, and fault is investigated.
By judging that whether the theoretical fuel delivery of exporting in two closed loop rail pressure control systems is less than or equal to minimum threshold, if the first actual rail pressure perseverance is greater than setting rail pressure and described theoretical fuel delivery greater than minimum threshold, the proof high pressure oil pump is controlled surplus in addition, can continue to regulate by the control of rail pressure outer shroud, namely by the described fuel gauging of control unit, enter the fuel flow of high pressure oil pump with minimizing, thereby can reduce the amount of fuel that flows in the common rail pipe, final so that the first actual rail pressure of common rail pipe is approached the setting rail pressure; So, when the first actual rail pressure continues when setting rail pressure and theoretical fuel feeding greater than minimum threshold, can determine that it is outer shroud control problem that high pressure oil pump can't be set up the failure cause of low rail pressure, at this moment, determine to stop faut detection after the failure cause, and by control improves to outer shroud, to realize setting up the purpose of low rail pressure.
If but the theoretical fuel delivery of fuel gauging unit is less than or equal to minimum threshold in the two closed loop rail pressure control system, then can get rid of outer shroud control problem, this moment, execution in step 5403 detected fault continuing.
S403: the actual current that detects described fuel gauging unit.
S404: the actual current of judging described fuel gauging unit and the difference of setting electric current whether in setting range, if so, execution in step S405 then, if not, then execution in step S 409.
Because no matter whether the first actual rail pressure follows the setting rail pressure, as long as described fuel gauging unit hardware circuit and wire harness fault-free, the electric current of fuel gauging unit just can well be followed.So when current following error (actual current and the difference of setting electric current) when (in the setting range), illustrates that drive circuit or the wire harness of described fuel gauging unit do not break down in rational margin of error; Otherwise, if when current following error (actual current and the difference of setting electric current) not in rational margin of error when (in the setting range), drive circuit or wire harness that the fuel gauging unit is described break down, at this moment, determine can drive circuit or the wire harness of fuel gauging unit to be detected and repair after the failure cause.
S405: control described fuel gauging unit to set dutycycle work, and detect the second actual rail pressure of described common rail pipe, described setting dutycycle is that maximum duty cycle adds the setting side-play amount, and the fuel flow that described setting dutycycle and described fuel gauging unit controls enter high pressure oil pump is inversely proportional to.
Can utilize above-mentioned pressure transducer to detect high pressure co-rail system common rail pipe pressure, to obtain the second actual rail pressure of common rail pipe.
S406: whether judge the amplitude of variation of described the second actual rail pressure less than setting threshold, if so, execution in step S407 then, if not, execution in step S408 then.
If described fuel gauging cell operation duty cycle adjustment is arrived maximum, and in the certain side-play amount of the basis of maximum duty cycle increase, detect the amplitude of variation of the second actual rail pressure of common rail pipe this moment, if the amplitude of variation of the second actual rail pressure is large (amplitude of variation of the second actual rail pressure is not less than setting threshold), prove that then the fuel gauging unit still has the control surplus, fuel delivery and calibration curve and the characteristic curve behind the characteristic drift between electric current (or dutycycle) that the fuel gauging unit is described are inconsistent, at this moment, can determine that the characteristic drift fault appears in described fuel gauging unit, can revise by the again demarcation of curve in this case and come.
If but the amplitude of variation of the second actual rail pressure less (amplitude of variation of the second actual rail pressure is less than setting threshold), and got rid of the above-mentioned three kinds of failure causes that can't set up low rail pressure this moment, just can determine it is that there was a mechanical failure for high pressure oil pump.
S407: there was a mechanical failure to determine described high pressure oil pump.
Wherein, the mechanical failure of described high pressure oil pump comprises: the slit greatly when described fuel gauging unit was closed or the zero oil mass hole of high pressure oil pump is too small or obstruction.
Because the fuel gauging unit generally can't be closed fully, when needs were set up low rail pressure, the unnecessary fluid when the fuel gauging unit is closed need to reflux through zero passage oil mass hole could set up low pressure.
S408: determine that the characteristic drift fault appears in described fuel gauging unit.
S409: drive circuit or the wire harness of determining described fuel gauging unit break down.
S410: determine that rail pressure outer shroud control problem appears in described pair of closed loop rail pressure control system.
High pressure co-rail system can't be set up low rail pressure four large class reasons: rail pressure outer shroud control problem; Fuel gauging unit PWM drive circuit or wire harness have problem; Fuel gauging element characteristics curves shift; The high pressure oil pump mechanical problem.Different alarm signals can be set for different fault modes, so that fault mode is distinguished, thereby carry out malfunction elimination for concrete fault.Specific as follows:
If drive circuit or the wire harness of 1 described fuel gauging unit break down, then send the first alarm signal;
If the characteristic drift fault appears in 2 described fuel gauging unit, then send the second alarm signal;
If there was a mechanical failure for 3 described high pressure oil pumps, then send the 3rd alarm signal;
If rail pressure outer shroud control problem appears in 4 described double closed-loop control systems, then send the 4th alarm signal.
High pressure oil pump of the present invention can't be set up the fault detection method of low rail pressure, and under the unloaded idling operation of motor, if rail pressure is in closed loop control, and the lasting bigger than normal and theoretical fuel delivery of actual rail pressure then can be got rid of rail pressure outer shroud control problem less than or equal to minimum value; If the current closed-loop error in the reasonable scope, then get rid of fuel gauging unit hardware circuit and wire harness problem; Utilize the open loop diverter switch to set the open loop dutycycle and add side-play amount for maximum duty cycle, get rid of fuel gauging element characteristics drifting problem if actual rail pressure amplitude of variation is less, above three kinds of reasons all are excluded can be confirmed as the high pressure oil pump mechanical reason and cause setting up low rail pressure, is generally high pressure oil pump zero oil mass hole too small or stop up.As seen, the present invention can accurately distinguish the fault mode that can't set up low rail pressure, thereby is convenient to the eliminating of fault.
Referring to shown in Figure 5, Fig. 5 is the structural representation that a kind of high pressure oil pump provided by the invention can't be set up the Fail detecting apparatus of low rail pressure, and Fig. 5 can't set up device corresponding to the fault detection method of low rail pressure with high pressure oil pump shown in Figure 4, and this device comprises:
The first detection unit 1, be used in two closed loop rail pressure control system, when the actual fuel flow that utilizes the fuel gauging unit controls to flow into high pressure oil pump during for minimum discharge, detect the first actual rail pressure of common rail pipe, described pair of closed loop rail pressure control system adopts rail pressure outer shroud feedback control and current inner loop feedback control;
The first judging unit 2 is used for judging whether the described first actual rail pressure is permanent in setting rail pressure;
The second judging unit 3 is used for judging that at described the first judging unit 2 the described first actual rail pressure perseverance of obtaining when setting rail pressure, judges that whether the theoretical fuel delivery of fuel gauging unit in the described pair of closed loop rail pressure control system is less than or equal to minimum threshold;
The second detection unit 4 is used for detecting the actual current of described fuel gauging unit when described the second judging unit 3 judges that the described theoretical fuel delivery that obtains is less than or equal to minimum threshold;
The 3rd judging unit 5 is used for judging that described actual current and the difference of setting electric current are whether in setting range;
The first determining unit 6 is used for determining that drive circuit or the wire harness of described fuel gauging unit breaks down when described the 3rd judging unit 5 judges that the described actual current that obtains and the difference of setting electric current be not in setting range;
Described the first detection unit 1 also is used for controlling described fuel gauging unit with after setting dutycycle work at described control unit, detects the second actual rail pressure of described common rail pipe;
The 4th judging unit 8 is used for judging that whether the amplitude of variation of described the second actual rail pressure is less than setting threshold;
The second determining unit 9 is used for determining that the characteristic drift fault appears in described fuel gauging unit when described the 4th judging unit 8 judges that the amplitude of variation of described the second actual rail pressure that obtains is not less than setting threshold;
The 3rd determining unit 10, the amplitude of variation that is used for judging described the second actual rail pressure that obtains at described the 4th judging unit 8 are during less than setting threshold, and there was a mechanical failure to determine described high pressure oil pump.
The 4th determining unit 11 is used for determining that rail pressure outer shroud control problem appears in described pair of closed loop rail pressure control system when described the second judging unit 3 judges that the described theoretical fuel delivery that obtains is greater than minimum threshold.
Wherein, described the first detection unit 1 specifically is used for the first actual rail pressure or the second actual rail pressure that adopts pressure sensor detects described common rail pipe.
Wherein, described mechanical failure comprises: the slit greatly when described fuel gauging unit was closed or the zero oil mass hole of high pressure oil pump is too small or obstruction.
In addition, said apparatus also comprises:
The first transmitting element 12 is used for then sending the first alarm signal when the drive circuit of the described fuel gauging unit that described the first determining unit 6 is determined or wire harness break down;
The second transmitting element 13 when the characteristic drift fault occurring for the described fuel gauging unit of determining in described the second determining unit 9, then sends the second alarm signal;
The 3rd transmitting element 14 when there was a mechanical failure for the described high pressure oil pumps of determining in described the 3rd determining unit 10, then sends the 3rd alarm signal;
The 4th transmitting element 15 is used for then sending the 4th alarm signal when rail pressure outer shroud control problem appears in the described double closed-loop control system that described the 4th determining unit 11 is determined.
High pressure oil pump of the present invention can't be set up the Fail detecting apparatus of low rail pressure, and under the unloaded idling operation of motor, if rail pressure is in closed loop control, and the lasting bigger than normal and theoretical fuel delivery of actual rail pressure then can be got rid of rail pressure outer shroud control problem less than or equal to minimum value; If the current closed-loop error in the reasonable scope, then get rid of fuel gauging unit hardware circuit and wire harness problem; Utilize the open loop diverter switch to set the open loop dutycycle and add side-play amount for maximum duty cycle, get rid of fuel gauging element characteristics drifting problem if actual rail pressure amplitude of variation is less, above three kinds of reasons all are excluded can be confirmed as the high pressure oil pump mechanical reason and cause setting up low rail pressure, is generally high pressure oil pump zero oil mass hole too small or stop up.As seen, the present invention can accurately distinguish the fault mode that can't set up low rail pressure, thereby is convenient to the eliminating of fault.
Also need to prove, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or control panel, and not necessarily requires or hint and have the relation of any this reality or sequentially between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
To the above-mentioned explanation of the disclosed embodiments, make related domain professional and technical personnel can realize or use the present invention.Multiple modification to these embodiments will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a high pressure oil pump can't be set up the fault detection method that hangs down rail pressure, it is characterized in that, comprising:
In two closed loop rail pressure control system, when the actual fuel flow that utilizes the fuel gauging unit controls to flow into high pressure oil pump during for minimum discharge, detect the first actual rail pressure of common rail pipe, described pair of closed loop rail pressure control system adopts rail pressure outer shroud feedback control and current inner loop feedback control;
If the described first actual rail pressure perseverance judges then greater than setting rail pressure whether the theoretical fuel delivery of fuel gauging unit in the described pair of closed loop rail pressure control system is less than or equal to minimum threshold;
If described theoretical fuel delivery is less than or equal to minimum threshold, then detect the actual current of described fuel gauging unit;
If the difference of described actual current and setting electric current not in setting range, determines then that drive circuit or the wire harness of described fuel gauging unit breaks down;
If the difference of described actual current and setting electric current is in setting range, then control described fuel gauging unit to set dutycycle work, and detect the second actual rail pressure of described common rail pipe, described setting dutycycle is that maximum duty cycle adds the setting side-play amount, and the fuel flow that described setting dutycycle and described fuel gauging unit controls enter high pressure oil pump is inversely proportional to;
If the amplitude of variation of described the second actual rail pressure is not less than setting threshold, determine that then the characteristic drift fault appears in described fuel gauging unit;
There was a mechanical failure if the amplitude of variation of described the second actual rail pressure, is then determined described high pressure oil pump less than setting threshold.
2. method according to claim 1 is characterized in that, if described theoretical fuel delivery, determines then that rail pressure outer shroud control problem appears in described pair of closed loop rail pressure control system greater than minimum threshold.
3. method according to claim 1 is characterized in that, described mechanical failure comprises: the slit greatly when described fuel gauging unit was closed or the zero oil mass hole of high pressure oil pump is too small or obstruction.
4. method according to claim 2 is characterized in that, described method also comprises:
If drive circuit or the wire harness of described fuel gauging unit break down, then send the first alarm signal;
If the characteristic drift fault appears in described fuel gauging unit, then send the second alarm signal;
If there was a mechanical failure for described high pressure oil pump, then send the 3rd alarm signal;
If rail pressure outer shroud control problem appears in described double closed-loop control system, then send the 4th alarm signal.
5. according to claim 1 to 4 each described methods, it is characterized in that, adopts pressure sensor detects the first actual rail pressure or the second actual rail pressure of described common rail pipe.
6. a high pressure oil pump can't be set up the Fail detecting apparatus that hangs down rail pressure, it is characterized in that, comprising:
The first detection unit, be used in two closed loop rail pressure control system, when the actual fuel flow that utilizes the fuel gauging unit controls to flow into high pressure oil pump during for minimum discharge, detect the first actual rail pressure of common rail pipe, described pair of closed loop rail pressure control system adopts rail pressure outer shroud feedback control and current inner loop feedback control;
The first judging unit is used for judging whether the described first actual rail pressure is permanent in setting rail pressure;
The second judging unit is used for the described first actual rail pressure perseverance of obtaining in described the first judgment unit judges when setting rail pressure, judges that whether the theoretical fuel delivery of fuel gauging unit in the described pair of closed loop rail pressure control system is less than or equal to minimum threshold;
The second detection unit when being used for the described theoretical fuel delivery that obtains in described the second judgment unit judges less than or equal to minimum threshold, detects the actual current of described fuel gauging unit;
The 3rd judging unit is used for judging that described actual current and the difference of setting electric current are whether in setting range;
The first determining unit is used for the described actual current that obtains in described the 3rd judgment unit judges and not in setting range the time, determines that drive circuit or the wire harness of described fuel gauging unit breaks down with the difference of setting electric current;
Control unit, be used for the described actual current that obtains in described the 3rd judgment unit judges with the difference of setting electric current in setting range the time, control described fuel gauging unit to set dutycycle work, described setting dutycycle is that maximum duty cycle adds the setting side-play amount, and the fuel flow that described setting dutycycle and described fuel gauging unit controls enter high pressure oil pump is inversely proportional to;
Described the first detection unit also is used for controlling described fuel gauging unit with after setting dutycycle work at described control unit, detects the second actual rail pressure of described common rail pipe;
The 4th judging unit is used for judging that whether the amplitude of variation of described the second actual rail pressure is less than setting threshold;
The second determining unit when the amplitude of variation that is used for described the second actual rail pressure of obtaining in described the 4th judgment unit judges is not less than setting threshold, determines that the characteristic drift fault appears in described fuel gauging unit;
The 3rd determining unit, the amplitude of variation that is used for described the second actual rail pressure of obtaining in described the 4th judgment unit judges are during less than setting threshold, and there was a mechanical failure to determine described high pressure oil pump.
7. device according to claim 6 is characterized in that, described device also comprises:
The 4th determining unit when being used for the described theoretical fuel delivery that obtains in described the second judgment unit judges greater than minimum threshold, determines that rail pressure outer shroud control problem appears in described pair of closed loop rail pressure control system.
8. device according to claim 6 is characterized in that, described mechanical failure comprises: the slit greatly when described fuel gauging unit was closed or the zero oil mass hole of high pressure oil pump is too small or obstruction.
9. device according to claim 7 is characterized in that, described device also comprises:
The first transmitting element is used for then sending the first alarm signal when the drive circuit of the described fuel gauging unit that described the first determining unit is determined or wire harness break down;
The second transmitting element when the characteristic drift fault occurring for the described fuel gauging unit of determining in described the second determining unit, then sends the second alarm signal;
The 3rd transmitting element when there was a mechanical failure for the described high pressure oil pump of determining in described the 3rd determining unit, then sends the 3rd alarm signal;
The 4th transmitting element is used for then sending the 4th alarm signal when rail pressure outer shroud control problem appears in the described double closed-loop control system that described the 4th determining unit is determined.
10. according to claim 6 to 9 each described devices, it is characterized in that described the first detection unit specifically is used for the first actual rail pressure or the second actual rail pressure that adopts pressure sensor detects described common rail pipe.
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| CN104481715A (en) * | 2014-12-03 | 2015-04-01 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Fault detection method of high-pressure fuel pump |
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Application publication date: 20130501 Assignee: Weifang Weichai Deutz Diesel Engine Co., Ltd. Assignor: Weichai Dynamic Co., Ltd. Contract record no.: 2015990000093 Denomination of invention: Method and device for detecting fault of high-pressure oil pump incapable of establishing low rail pressure Granted publication date: 20141105 License type: Exclusive License Record date: 20150311 |
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