CN103016181A - Method for acquiring and monitoring oil orbit pressure signal - Google Patents

Method for acquiring and monitoring oil orbit pressure signal Download PDF

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Publication number
CN103016181A
CN103016181A CN2012104645317A CN201210464531A CN103016181A CN 103016181 A CN103016181 A CN 103016181A CN 2012104645317 A CN2012104645317 A CN 2012104645317A CN 201210464531 A CN201210464531 A CN 201210464531A CN 103016181 A CN103016181 A CN 103016181A
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CN
China
Prior art keywords
pressure signal
rail pressure
processing unit
central processing
oil
Prior art date
Application number
CN2012104645317A
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Chinese (zh)
Inventor
李伯承
Original Assignee
奇瑞汽车股份有限公司
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Publication date
Application filed by 奇瑞汽车股份有限公司 filed Critical 奇瑞汽车股份有限公司
Priority to CN2012104645317A priority Critical patent/CN103016181A/en
Publication of CN103016181A publication Critical patent/CN103016181A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/38Controlling fuel injection of the high pressure type
    • F02D41/40Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D2200/00Input parameters for engine control
    • F02D2200/02Input parameters for engine control the parameters being related to the engine
    • F02D2200/06Fuel or fuel supply system parameters
    • F02D2200/0602Fuel pressure
    • Y02T10/44

Abstract

The invention provides a method for acquiring and monitoring an oil orbit pressure signal accurately and comprehensively in real time so as to improve the performance of an engine. The method for acquiring and monitoring the oil orbit pressure signal comprises the following steps: a central processing unit utilizes an orbit pressure sensor to measure an oil spray orbit pressure signal of an oil spray time point and a peak orbit pressure signal within the preset interval time T, and controls the oil spray quantity according to the oil spray orbit pressure signal; the central processing unit judges whether the peak orbit pressure signal exceeds the preset range or not and monitors the dynamic drifting of the peak orbit pressure signal at the starting stage; and when the peak orbit pressure signal exceeds the preset range or the dynamic drifting of the peak orbit pressure signal exceeds the preset value, the central processing unit substitutes the preset orbit pressure value for the actual orbit pressure signal so as to enter a LimpHome mode. By the method for acquiring and monitoring the oil orbit pressure signal, an innovative method is adopted at the stages of signal acquisition, failure judgment and processing, so that the engine is served better and the work efficiency of the engine is higher.

Description

A kind of collection of pressure signal of oil rail and monitoring method

Technical field

The invention belongs to the technical field of vehicle complete vehicle power transmission control system, control system to fuel pressure in the oily rail of power system gather, monitor with and the specific implementation of failure diagnostic process, can be used for the vehicles such as Design of High Pressure Common Rail Diesel Engine and directly jetting gasoline engine.

Background technique

Under the form of current energy scarcity, Design of High Pressure Common Rail Diesel Engine has been applied to the passenger car field more and more because its oil consumption is low, pollute little reason.The appearance of direct spray petrol engine in cylinder is more importantly inputted parameter so that the oily rail pressure of power system becomes of power system control strategy again.If the oil rail pressure calculates inaccurate, it is inaccurate to cause oil spout to be calculated, will cause so engine performance unstable, and then have influence on power character, Economy and the discharging of motor and car load, the reliability of power system parts and durability are faced with severe tests.Although the system that present minority has monitoring function can realize collection and monitoring to oily rail pressure, but its monitoring policy is fairly simple, can not reach in real time, accurately, comprehensively monitoring, can occur image data unreasonable, can not reflect in real time that oily rail pressure changes and the misrepresenting deliberately and fail to report defective of fault.

Summary of the invention

The objective of the invention is to propose a kind of collection and monitoring method real-time, accurate, comprehensively pressure signal of oil rail, to improve engine performance.

Collection and the monitoring method of pressure signal of oil rail of the present invention are as follows: central processing unit utilizes rail pressure sensor to measure the oil spout rail pressure signal of oil spout moment point and the peak value rail pressure signal in the predetermined interval T, and controls fuel injection quantity according to oil spout rail pressure signal; Central processing unit judges also whether peak value rail pressure signal exceeds prespecified range, and the start up period dynamic drift of peak value rail pressure signal monitored, when the dynamic drift that exceeds prespecified range or peak value rail pressure signal when peak value rail pressure signal exceeds predetermined value, central processing unit replaces actual rail pressure signal with predetermined rail pressure value, thereby enters Limp Home pattern.

Specifically, described central processing unit is after system powers on, read the engine water temperature t_last of a upper driving cycle of storing, then current water temperature t_time is compared with t_last, if current water temperature t_time surpasses setting value t_const than the amplitude that t_last reduces, and this moment, engine speed equalled zero, and can think that namely the oily rail pressure of this moment equals barometric pressure, the monitoring of beginning dynamic drift; If after system powers on, central processing unit reads a driving cycle water temperature t_last failure, and perhaps the difference of current water temperature t_time and t_last does not surpass setting value t_const, and perhaps engine speed is not then carried out dynamic drift and detected greater than zero.Be strict controlled in starting period and carry out the dynamic drift detection, can make testing result not be subjected to motor, thereby guarantee accurately and reliably.

Further, when the fault that the dynamic drift that only peak value rail pressure signal exceeds prespecified range or peak value rail pressure signal in predetermined time length T con exceeds predetermined value exists always, central processing unit confirms that just fault is true, occur in fault but do not confirmed that by central processing unit when true, the peak value rail pressure signal that central processing unit will be measured last time is as actual rail pressure signal; After central processing unit confirmed that fault is true, central processing unit replaced actual rail pressure signal with predetermined rail pressure value, thereby enters Limp Home pattern.Confirm by setting a time span Tcon whether fault is true, and after fault occurs and the unacknowledged stage adopt the peak value rail pressure signal of measuring last time as actual rail pressure signal, can avoid taking too to guard or fierce processing method when causing the fault erroneous judgement disconnected because once in a while signal disturbs, and then affect the work of motor.

Further, during the peak value rail pressure signal of central processing unit in measuring predetermined interval T, at first gather force value one time every the T1 time, and the force value that collects is stored in the data buffer, the maximum value of the force value of storing in data buffer every the T time is again taken out the peak value rail pressure signal that gathers as current, utilizes this peak value rail pressure signal to carry out system's control and malfunction monitoring; Described T1 is less than T.

Further, central processing unit at first arranges an oil spout dynamic switch when measuring the oil spout rail pressure signal of oil spout moment point, and it is closed before each time system's oil spout to control this oil spout dynamic switch, thereby gathers current oily rail pressure.

The collection of pressure signal of oil rail of the present invention and monitoring method by judge in signals collecting, fault and the treatment phase adopt the way of innovation formula, can serve better motor, make the work of motor more efficient.

Description of drawings

Fig. 1 is the flow chart that pressure signal of oil rail gathers.

Fig. 2 is the flow chart of pressure signal of oil rail monitoring.

Fig. 3 is the flow chart that oily rail pressure dynamic drift detects.

Fig. 4 is the flow chart that fault is confirmed.

Embodiment

The below contrasts accompanying drawing, by the description to embodiment, the effect of the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, the each several part and annexation, each several part and working principle etc. are described in further detail.

Embodiment 1:

Collection and the monitoring method of pressure signal of oil rail of the present invention are as follows: central processing unit utilizes rail pressure sensor to measure the oil spout rail pressure signal of oil spout moment point and the peak value rail pressure signal in the predetermined interval T, and controls fuel injection quantity according to oil spout rail pressure signal; Central processing unit judges also whether peak value rail pressure signal exceeds prespecified range, and the start up period dynamic drift of peak value rail pressure signal monitored, when the dynamic drift that exceeds prespecified range or peak value rail pressure signal when peak value rail pressure signal exceeds predetermined value, central processing unit replaces actual rail pressure signal with predetermined rail pressure value, thereby enters Limp Home pattern.

Concrete steps are as follows:

As shown in Figure 1, central processing unit is divided into the output signal (ADC among the figure is the analog-digital conversion unit) that dual mode comes pick-up transducers for rail pressure signal role in system:

A kind of is as oil spout rail pressure signal, and the acquisition method of oil spout rail pressure signal is that an oil spout dynamic switch is set, and it is closed before each time oil spout to control this oil spout dynamic switch, is used for gathering current oily rail pressure, and oil spout comprises main jet, in advance spray and rear spray.This pressure is the jet pressure of fuel oil this time.Do like this and can calculate more accurately injection pressure, thus can accurate Calculation and control fuel injection quantity.

Another kind is the peak value rail pressure signal as system control parameters, describes as predetermined interval T with 10ms, and peak value rail pressure signal is the pressure maximum value of getting in the 10ms.Central processing unit arranges first a 1ms time switch, each millisecond gathers a force value, then be stored in the buffer that to store 10 image data, a 10ms time switch is set again, the maximum value of the force value of storing in data buffer every 10ms is taken out the surge pressure that gathers as current, utilizes this surge pressure to carry out system's control and malfunction monitoring.

As shown in Figure 2, after gathering oil spout rail pressure signal and peak value rail pressure signal, central processing unit utilizes oil spout rail pressure signal to control fuel injection quantity, and judges whether peak value rail pressure signal breaks down.Namely judge peak value rail pressure signal whether in the zone of reasonableness of setting, perhaps whether the drift of peak value rail pressure signal dynamics is excessive.When peak value rail pressure signal exceeds zone of reasonableness or dynamic drift when excessive, carry out the fault treatment stage.

Wherein, excessive step is as shown in Figure 3 to judge peak value rail pressure signal dynamics drift, central processing unit is after system powers on, read the engine water temperature t_last of a upper driving cycle of storing, then current water temperature t_time is compared with t_last, if current water temperature t_time surpasses setting value t_const than the amplitude that t_last reduces, and this moment, engine speed equalled zero, expression motor this moment is not also set up rail pressure, namely this moment, rail pressure should equal atmospheric pressure, if this moment, pressure drift was excessive, judge that then the measurement of rail pressure signal is inaccurate, namely monitor fault and occur; If after system powers on, central processing unit reads a driving cycle water temperature t_last failure, and perhaps the difference of current water temperature t_time and t_last does not surpass setting value t_const, and perhaps engine speed is not then carried out dynamic drift and detected greater than zero.Be strict controlled in starting period and carry out the dynamic drift detection, can make testing result not be subjected to motor, thereby guarantee accurately and reliably.

Further, after fault occured, system did not deposit fault in failure memory immediately, and central processing unit need to be confirmed to process to fault, only had when fault always existence in section sometime, and fault just is identified.When the fault that the dynamic drift that namely only peak value rail pressure signal exceeds prespecified range or peak value rail pressure signal in predetermined time length T con exceeds predetermined value exists always, central processing unit confirms that just fault is true, occur in fault but do not confirmed that by central processing unit when true, the peak value rail pressure signal that central processing unit will be measured last time is as actual rail pressure signal; After central processing unit confirmed that fault is true, central processing unit replaced actual rail pressure signal with predetermined rail pressure value, thereby enters Limp Home pattern.Confirm by setting a time span Tcon whether fault is true, and after fault occurs and the unacknowledged stage adopt the peak value rail pressure signal of measuring last time as actual rail pressure signal, can avoid taking too to guard or fierce processing method when causing the fault erroneous judgement disconnected because once in a while signal disturbs, and then affect the work of motor.

As shown in Figure 4 (in Fig. 4, AB<Tcon<CD.), fault was monitored in the AB stage, but because time of failure does not reach the fault recognition time T con of default, and then fault is not identified, in the stage, the peak value rail pressure signal that central processing unit will be measured last time is as actual rail pressure signal at AB.CD stage internal fault is monitored to again, and time of failure reaches the fault recognition time T con of default, and then fault is identified and stores.Before the D point, system's rail pressure is got the effective value of a measurement, after the D point, central processing unit replaces actual rail pressure signal with predetermined rail pressure value, this moment, system entered Limp Home pattern, be limp-home mode, there is fault in system by the meter lamp driver, need to place under repair.

Claims (5)

1. the collection of a pressure signal of oil rail and monitoring method, it is characterized in that central processing unit utilizes rail pressure sensor to measure the oil spout rail pressure signal of oil spout moment point and the peak value rail pressure signal in the predetermined interval T, and control fuel injection quantity according to oil spout rail pressure signal; Central processing unit judges also whether peak value rail pressure signal exceeds prespecified range, and the start up period dynamic drift of peak value rail pressure signal monitored, when the dynamic drift that exceeds prespecified range or peak value rail pressure signal when peak value rail pressure signal exceeds predetermined value, central processing unit replaces actual rail pressure signal with predetermined rail pressure value, thereby enters Limp Home pattern.
2. the collection of pressure signal of oil rail according to claim 1 and monitoring method, it is characterized in that described central processing unit is after system powers on, read the engine water temperature t_last of a upper driving cycle of storing, then current water temperature t_time is compared with t_last, if current water temperature t_time surpasses setting value t_const than the amplitude that t_last reduces, and this moment, engine speed equalled zero, can think that namely the oily rail pressure of this moment equals barometric pressure, the monitoring of beginning dynamic drift; If after system powers on, central processing unit reads a driving cycle water temperature t_last failure, and perhaps the difference of current water temperature t_time and t_last does not surpass setting value t_const, and perhaps engine speed is not then carried out dynamic drift and detected greater than zero.
3. the collection of pressure signal of oil rail according to claim 1 and 2 and monitoring method, when only it is characterized in that fault that dynamic drift that in predetermined time length T con peak value rail pressure signal exceeds prespecified range or peak value rail pressure signal exceeds predetermined value exists always, central processing unit confirms that just fault is true, occur in fault but do not confirmed that by central processing unit when true, the peak value rail pressure signal that central processing unit will be measured last time is as actual rail pressure signal; After central processing unit confirmed that fault is true, central processing unit replaced actual rail pressure signal with predetermined rail pressure value, thereby enters Limp Home pattern.
4. the collection of pressure signal of oil rail according to claim 3 and monitoring method, when it is characterized in that the peak value rail pressure signal of central processing unit in measuring predetermined interval T, at first gather force value one time every the T1 time, and the force value that collects is stored in the data buffer, the maximum value of the force value of storing in data buffer every the T time is again taken out the peak value rail pressure signal that gathers as current, utilizes this peak value rail pressure signal to carry out system's control and malfunction monitoring; Described T1 is less than T.
5. the collection of pressure signal of oil rail according to claim 3 and monitoring method, it is characterized in that central processing unit is when measuring the oil spout rail pressure signal of oil spout moment point, an oil spout dynamic switch at first is set, and it is closed before each time system's oil spout to control this oil spout dynamic switch, thereby gather current oily rail pressure.
CN2012104645317A 2012-11-19 2012-11-19 Method for acquiring and monitoring oil orbit pressure signal CN103016181A (en)

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CN2012104645317A CN103016181A (en) 2012-11-19 2012-11-19 Method for acquiring and monitoring oil orbit pressure signal
PCT/CN2013/080891 WO2014075468A1 (en) 2012-11-19 2013-08-06 Method of collecting and monitoring oil path pressure signal

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014075468A1 (en) * 2012-11-19 2014-05-22 奇瑞汽车股份有限公司 Method of collecting and monitoring oil path pressure signal
CN104806367A (en) * 2014-01-29 2015-07-29 陕西汽车实业有限公司 Special chassis system for pavement microcosmic reproduction vehicle
CN105705754A (en) * 2013-08-15 2016-06-22 Mtu 腓特烈港有限责任公司 Method for thermal protection of an internal combustion engine of a motor vehicle and corresponding engine computer
CN106704011A (en) * 2016-12-14 2017-05-24 中国第汽车股份有限公司 Rail pressure control optimization method under rail pressure sensor failure mode
CN110005536A (en) * 2019-06-06 2019-07-12 潍柴动力股份有限公司 A kind of method of calibration of rail pressure sensor, device and engine

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US6293251B1 (en) * 1999-07-20 2001-09-25 Cummins Engine, Inc. Apparatus and method for diagnosing erratic pressure sensor operation in a fuel system of an internal combustion engine
JP2006329033A (en) * 2005-05-25 2006-12-07 Denso Corp Accumulator fuel injection device
CN101583786A (en) * 2006-11-15 2009-11-18 欧陆汽车有限责任公司 Method for testing the operation of a pressure sensing unit of an injection system of an internal combustion engine
CN101598073A (en) * 2009-07-10 2009-12-09 奇瑞汽车股份有限公司 A kind of collection of pressure signal of oil rail and monitoring method
CN102272434A (en) * 2008-12-31 2011-12-07 瓦锡兰芬兰有限公司 Pressure control in the common rail system of a combustion engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103016181A (en) * 2012-11-19 2013-04-03 奇瑞汽车股份有限公司 Method for acquiring and monitoring oil orbit pressure signal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6293251B1 (en) * 1999-07-20 2001-09-25 Cummins Engine, Inc. Apparatus and method for diagnosing erratic pressure sensor operation in a fuel system of an internal combustion engine
JP2006329033A (en) * 2005-05-25 2006-12-07 Denso Corp Accumulator fuel injection device
CN101583786A (en) * 2006-11-15 2009-11-18 欧陆汽车有限责任公司 Method for testing the operation of a pressure sensing unit of an injection system of an internal combustion engine
CN102272434A (en) * 2008-12-31 2011-12-07 瓦锡兰芬兰有限公司 Pressure control in the common rail system of a combustion engine
CN101598073A (en) * 2009-07-10 2009-12-09 奇瑞汽车股份有限公司 A kind of collection of pressure signal of oil rail and monitoring method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014075468A1 (en) * 2012-11-19 2014-05-22 奇瑞汽车股份有限公司 Method of collecting and monitoring oil path pressure signal
CN105705754A (en) * 2013-08-15 2016-06-22 Mtu 腓特烈港有限责任公司 Method for thermal protection of an internal combustion engine of a motor vehicle and corresponding engine computer
CN104806367A (en) * 2014-01-29 2015-07-29 陕西汽车实业有限公司 Special chassis system for pavement microcosmic reproduction vehicle
CN106704011A (en) * 2016-12-14 2017-05-24 中国第汽车股份有限公司 Rail pressure control optimization method under rail pressure sensor failure mode
CN106704011B (en) * 2016-12-14 2019-05-10 中国第一汽车股份有限公司 The method that rail pressure control optimizes under rail pressure sensor fault mode
CN110005536A (en) * 2019-06-06 2019-07-12 潍柴动力股份有限公司 A kind of method of calibration of rail pressure sensor, device and engine
CN110005536B (en) * 2019-06-06 2019-09-03 潍柴动力股份有限公司 A kind of method of calibration of rail pressure sensor, device and engine

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Application publication date: 20130403