CN101598073A - A kind of collection of pressure signal of oil rail and monitoring method - Google Patents

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

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Publication number
CN101598073A
CN101598073A CNA200910144102XA CN200910144102A CN101598073A CN 101598073 A CN101598073 A CN 101598073A CN A200910144102X A CNA200910144102X A CN A200910144102XA CN 200910144102 A CN200910144102 A CN 200910144102A CN 101598073 A CN101598073 A CN 101598073A
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CN
China
Prior art keywords
monitoring
pressure
rail
fault
collection
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CNA200910144102XA
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Chinese (zh)
Inventor
聂家谊
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奇瑞汽车股份有限公司
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Priority to CNA200910144102XA priority Critical patent/CN101598073A/en
Publication of CN101598073A publication Critical patent/CN101598073A/en

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems

Abstract

The present invention relates to a kind of collection and monitoring method of pressure signal of oil rail, comprise the step of following order: (1) rail pressure sensor is gathered the pressure of oily rail in real time, and force value is stored, and takes out pressure peak for monitoring from the force value of being stored; (2) pressure peak of being gathered is monitored in real time, and judge whether sensor breaks down; (3) if the judged result of step (2) for being, then fault is confirmed and is stored, otherwise, return step (2).The present invention is by gathering the pressure signal of oily rail in real time, to satisfy the control requirement of power control system, simultaneously, by real-time monitoring pressure signal of oil rail, all contingent faults of comprehensive and accurate monitoring monitor and finish after the fault to the affirmation of fault with to the processing of fault.The present invention gathers, monitoring is comprehensive, is easy to realize, is convenient to software test and demarcation.

Description

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

Technical field

The present invention relates to the Vehicle Electronic Control field, especially a kind of collection of pressure signal of oil rail and monitoring method.

Background technique

Under the form of current energy scarcity, the high pressure co-rail diesel machine is owing to its oil consumption, the little reason of pollution, be applied in the passenger car field more and more, along with the appearance of direct spray petrol engine in cylinder, all make the oily rail pressure of automobile dynamic system become a more and more important input parameter of power system control strategy.If the oil rail pressure calculates inaccurate, it is inaccurate to cause oil spout to be calculated, will cause the engine performance instability so, 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.In the prior art at present, seldom oily rail pressure is reasonably gathered and monitored, it is also fairly simple that minority has the monitoring policy of system of monitoring function, can't reach in real time, accurately, comprehensively monitoring, still can occur image data unreasonable, can't reflect in real time that oily rail pressure changes and fault misrepresent deliberately and fail to report defective.

Summary of the invention

The object of the present invention is to provide a kind of collection and monitoring method of pressure signal of oil rail, pressure signal of oil rail can in real time, accurately, comprehensively be gathered and monitor to this method, and be easy to realize.

For achieving the above object, the collection of a kind of pressure signal of oil rail provided by the invention and monitoring method comprise the step of following order:

(1) rail pressure sensor is gathered the pressure of oily rail in real time, and force value is stored, and takes out pressure peak for monitoring from the force value of being stored;

(2) pressure peak of being gathered is monitored in real time, and judge whether sensor breaks down;

(3) if the judged result of step (2) for being, then fault is confirmed and is stored, otherwise, return step (2).

The present invention is by gathering the pressure signal of oily rail in real time, to satisfy the control requirement of power control system, simultaneously, by real-time monitoring pressure signal of oil rail, all contingent faults of comprehensive and accurate monitoring monitor and finish after the fault to the affirmation of fault with to the processing of fault.The present invention gathers, monitoring is comprehensive, is easy to realize, is convenient to software test and demarcation.

Description of drawings

Fig. 1 is the flow chart of acquisition method among the present invention;

Fig. 2 is the flow chart of monitoring method among the present invention;

Fig. 3 is the flow chart of dynamic drift monitoring method among Fig. 2;

The schematic representation of fault recognition state among Fig. 4 the present invention.

Embodiment

A kind of collection of pressure signal of oil rail and monitoring method, the step that comprises following order: the first step, the collection of pressure signal of oil rail, rail pressure sensor is gathered the pressure of oily rail in real time, and force value stored, from the force value of being stored, take out pressure peak for monitoring; In second step, the pressure peak of being gathered is monitored in real time, and judge whether sensor breaks down; The 3rd step, the affirmation after fault taken place, if the judged result in second step for being, then confirms fault and stores, otherwise, return second and go on foot.Shown in Fig. 1,2,3,4.

In conjunction with Fig. 1, at rail pressure signal role in power control system, be divided into the output signal that dual mode is gathered rail pressure sensor, and through Shelving circuit filtering interference signals:

One is gathered injection pressure in real time.Described rail pressure sensor is gathered the pressure before the oil spout each time of oily rail in real time, and exports this force value to power control system to calculate fuel injection quantity.The acquisition method of injection pressure is similar to an oil spout dynamic switch is set, this switch is closed before oil spout each time, be used for gathering current oily rail pressure, this pressure is the jet pressure of fuel oil this time, do like this and can calculate injection pressure more accurately, thereby the energy accurate Calculation is also controlled fuel injection quantity, and the injection pressure signal is converted to current injection pressure value through the ADC analog-digital converter;

Its two, gather oily rail pressure in real time.Rail pressure sensor is gathered the once pressure signal of oily rail every 1ms, after the conversion of ADC analog-digital converter this force value is stored in the data buffer, gets maximum value through the MAX unit, and takes out pressure peak for monitoring from data buffer every 10ms.This acquisition method is similar to a 1ms time switch is set earlier, every 1ms gathers a force value, be stored in then in the data buffer that can store ten image data, by hypothesis 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 pressure peak of gathering as current, utilizes this pressure peak to carry out the control and the malfunction monitoring of power control system.

In conjunction with Fig. 2, oily rail surge pressure is monitored, mainly carry out from two aspects:

One judges whether the pressure peak gathered exceeds predetermined scope, if exceed the maximin scope of setting, shows that then sensor breaks down, and fault is confirmed and store, as if not exceeding the maximin scope of setting, then returns real-time monitoring;

Its two, judge whether institute's monitored signal dynamic drift takes place, to confirm the confidence level of measurement signal,, show that then sensor breaks down if take place, fault is confirmed and store, if real-time monitoring is then returned in generation.Described dynamic drift monitoring is meant the difference of calculating oily rail pressure and atmospheric pressure, and this difference compared with zero, if difference equal zero or this difference less than a predefined less force value, for example corresponding to certain a co-rail diesel engine, this value is set at 1MPa, then dynamic drift does not take place in explanation, otherwise, illustrate dynamic drift takes place.

In conjunction with Fig. 3; the dynamic drift monitoring is after power control system powers on; carry out before the engine start; read a last driving circuit engine water temperature t_last who is stored in the power control system after powering on; then the present engine water temperature is compared with a last driving circuit engine water temperature t_last; if the former surpasses setting value t_const than the amplitude that the latter reduces; described setting value t_const is 20 ℃~30 ℃; for some time promptly apart from engine shutdown; and when engine speed is zero; it is not starting of motor; think that then this moment, oily rail pressure equaled barometric pressure; the beginning dynamic drift is monitored, and calculates the difference of oily rail pressure and atmospheric pressure, and this difference is compared with zero; if difference equal zero or this difference less than a predefined less force value; for example corresponding to certain a co-rail diesel engine, this value is set at 1MPa, and then dynamic drift does not take place in explanation; otherwise, illustrate dynamic drift take place.

In conjunction with Fig. 3, if after powering on, read one and drive circulating water temperature failure, water temperature and change and do not reach setting value or engine speed greater than zero, then do not carry out dynamic drift and detect.When system begins to carry out dynamic drift when monitoring, in monitoring time, motor is started, and promptly monitors rotating speed greater than zero the time, stops monitoring.Otherwise, finish observation process, enter fault judgement.If there is not fault to take place, then finish monitoring, if there is fault to take place, first storage failure also carries out fault treatment, finishes monitoring then.

In conjunction with Fig. 4, after a concrete fault takes place, be not to deposit failure memory immediately in, but through a fault recognition process, promptly when fault existence always in the time period of default, at this moment fault just is identified, and is stored in failure memory then.As shown in Figure 4, fault was monitored in the AB stage, but because time of failure does not reach the fault recognition time of default, and then fault is not identified, in the stage, system's rail pressure is got the effective value of a measurement at AB.CD stage internal fault is monitored to once more, and time of failure reaches the fault recognition time 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, the rail pressure value of system is got a pre-set substitution value, can be set between the 40-70Mpa such as this substitution value on a co-rail diesel engine, this substitution value is when doing engine calibration afterwards, set according to different motors, the foundation of setting is in order to make in rail pressure sensor when breaking down, and rail pressure is got this substitution value, and control system can also be worked normally, this moment, system entered Limp Home pattern, be limp-home mode, there is fault in system by the meter lamp driver, needs place under repair.

In a word, core of the present invention is on the one hand the injection pressure that collects to be inputed to power control system by dividing two aspects to gather the pressure signal of oily rail in real time, calculates fuel injection quantity for it; Another real-time pressure signal of oil rail that will collect inputs to power control system, for its monitoring usefulness, satisfies the control requirement of power control system comprehensively.Simultaneously,, monitor all contingent faults accurately, monitor and finish after the fault to the affirmation of fault with to the processing of fault by real-time monitoring pressure signal of oil rail.The present invention gathers, monitoring is comprehensive, is easy to realize, is convenient to software test and demarcation.

Claims (8)

1, a kind of collection of pressure signal of oil rail and monitoring method comprise the step of following order:
(1) rail pressure sensor is gathered the pressure of oily rail in real time, and force value is stored, and takes out pressure peak for monitoring from the force value of being stored;
(2) pressure peak of being gathered is monitored in real time, and judge whether sensor breaks down;
(3) if the judged result of step (2) for being, then fault is confirmed and is stored, otherwise, return step (2).
2, the collection of pressure signal of oil rail according to claim 1 and monitoring method, it is characterized in that: the acquisition method of described step (1) carries out simultaneously according to following two kinds of methods, one, described rail pressure sensor is gathered the pressure before the oil spout each time of oily rail in real time, and exports this force value to power control system to calculate fuel injection quantity; Its two, rail pressure sensor is gathered the once pressure of oily rail every 1ms, and this force value is stored in the data buffer, and takes out pressure peak for monitoring from data buffer every 10ms.
3, the collection of pressure signal of oil rail according to claim 1 and monitoring method, it is characterized in that: the monitoring method of described step (2) is carried out simultaneously according to following two kinds of methods, one, judge whether the pressure peak of being gathered exceeds predetermined scope, if go beyond the scope, show that then sensor breaks down, fault is confirmed and stored, if do not go beyond the scope, then return real-time monitoring; Its two, judge whether institute's monitored signal dynamic drift takes place, if take place, show that then sensor breaks down, fault is confirmed and store, if real-time monitoring is then returned in generation.
4, the collection of pressure signal of oil rail according to claim 1 and monitoring method, it is characterized in that: described fault existed in the time period of default always, just be identified, be stored in failure memory then, before fault recognition, effective rail pressure value of exporting a measurement after fault recognition, is exported predefined substitution value to power control system to power control system.
5, the collection of pressure signal of oil rail according to claim 3 and monitoring method, it is characterized in that: described dynamic drift monitoring is meant the difference of calculating oily rail pressure and atmospheric pressure, and this difference compared with zero, if difference equals zero, then dynamic drift does not take place in explanation, otherwise, illustrate dynamic drift take place.
6, according to the collection and the monitoring method of claim 3 or 5 described pressure signal of oil rail, it is characterized in that: read a last driving circuit engine water temperature that is stored in the power control system after powering on, then the present engine water temperature is compared with a last driving circuit engine water temperature, if the former surpasses setting value than the amplitude that the latter reduces, and when engine speed is zero, then begin the dynamic drift monitoring.
7, according to the collection and the monitoring method of claim 3 or 5 described pressure signal of oil rail, it is characterized in that: when system carries out in the process of dynamic drift monitoring,, then stop the dynamic drift monitoring if monitor engine speed greater than zero the time.
8, the collection of pressure signal of oil rail according to claim 6 and monitoring method is characterized in that: described setting value is 20 ℃~30 ℃.
CNA200910144102XA 2009-07-10 2009-07-10 A kind of collection of pressure signal of oil rail and monitoring method CN101598073A (en)

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Cited By (5)

* 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
CN106224108A (en) * 2016-08-29 2016-12-14 重庆隆鑫机车有限公司 Engine electric spray executor's self checking method and system
CN106593668A (en) * 2016-12-14 2017-04-26 中国第汽车股份有限公司 Rail pressure control method under rail pressure sensor failure modes
CN107989705A (en) * 2016-10-26 2018-05-04 铃木株式会社 The auto-stopper of engine
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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US6012438A (en) * 1997-05-21 2000-01-11 Robert Bosch Gmbh System for checking a pressure sensor of a fuel supply system for an internal combustion engine
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
DE10254464A1 (en) * 2001-11-22 2003-07-10 Denso Corp Common rail fuel injection system monitors pressure recorded by rail pressure sensor when engine is shut down using atmospheric pressure as reference pressure
CN1746475A (en) * 2004-09-10 2006-03-15 株式会社电装 Common rail fuel injection system
JP2006329033A (en) * 2005-05-25 2006-12-07 Denso Corp Accumulator fuel injection device
CN101245739A (en) * 2007-02-14 2008-08-20 福特全球技术公司 Sensor activation monitor
CN101263291A (en) * 2005-09-15 2008-09-10 罗伯特·博世有限公司 Method and device for monitoring a fuel metering system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6012438A (en) * 1997-05-21 2000-01-11 Robert Bosch Gmbh System for checking a pressure sensor of a fuel supply system for an internal combustion engine
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
DE10254464A1 (en) * 2001-11-22 2003-07-10 Denso Corp Common rail fuel injection system monitors pressure recorded by rail pressure sensor when engine is shut down using atmospheric pressure as reference pressure
CN1746475A (en) * 2004-09-10 2006-03-15 株式会社电装 Common rail fuel injection system
JP2006329033A (en) * 2005-05-25 2006-12-07 Denso Corp Accumulator fuel injection device
CN101263291A (en) * 2005-09-15 2008-09-10 罗伯特·博世有限公司 Method and device for monitoring a fuel metering system
CN101245739A (en) * 2007-02-14 2008-08-20 福特全球技术公司 Sensor activation monitor

Cited By (8)

* 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
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
CN106224108A (en) * 2016-08-29 2016-12-14 重庆隆鑫机车有限公司 Engine electric spray executor's self checking method and system
CN107989705A (en) * 2016-10-26 2018-05-04 铃木株式会社 The auto-stopper of engine
CN106593668A (en) * 2016-12-14 2017-04-26 中国第汽车股份有限公司 Rail pressure control method under rail pressure sensor failure modes
CN106593668B (en) * 2016-12-14 2019-10-29 中国第一汽车股份有限公司 Rail pressure control method 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: 20091209