CN106401771B - A method of OBD torque limit when preventing engine from climbing - Google Patents

A method of OBD torque limit when preventing engine from climbing Download PDF

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Publication number
CN106401771B
CN106401771B CN201610975854.0A CN201610975854A CN106401771B CN 106401771 B CN106401771 B CN 106401771B CN 201610975854 A CN201610975854 A CN 201610975854A CN 106401771 B CN106401771 B CN 106401771B
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China
Prior art keywords
engine
torque limit
obd
climbing
liquid level
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CN201610975854.0A
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Chinese (zh)
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CN106401771A (en
Inventor
朱金亮
李国祥
白书战
王桂华
胡潇宇
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Shandong University
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Shandong University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • F01M11/12—Indicating devices; Other safety devices concerning lubricant level
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2896—Liquid catalyst carrier
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention discloses it is a kind of prevent engine from climbing when OBD torque limit method, liquid level sensor is arranged in urea box side, liquid level variable quantity in urea box is acquired, assert that engine is being climbed if variable quantity is greater than calibration value, engine is forbidden to carry out OBD torque limit.The present invention need to only change the installation site of urea temperature liquid level sensor, identify whether engine climbs by control strategy on the basis of not increasing additional hardware and sensor.The present invention judges engine climb and fall by the liquid level slope characteristic that each class I liquid I such as urea level, fuel oil, machine oil has in engine climbing, descending, to release engine torque limit.

Description

A method of OBD torque limit when preventing engine from climbing
Technical field
The present invention relates to it is a kind of prevent engine from climbing when OBD torque limit method.
Background technique
With flourishing for automobile industry, engine exhaust emission has become environmental pollution and human health and can not ignore Factor.With the publication of national engine emission regulation and onboard diagnostic system regulation, it is desirable that in engine exhaust emission When NOx is more than 7g/Wk.h, torque limit is carried out to engine.
For the sake of security, regulation, which is distinctly claimed, limits engine torque in the following two kinds situation:
(1) when engine next time starts；
(2) when speed is very low.
Because vehicle class is more and the complexity of engine operation operating condition, it is possible to can happen that same In one driving cycle, since urea injection system failure or SCR crystallization cause engine exhaust emission to be more than regulation limit value (7g/Wk.h), but Vehicle Speed is very fast, thus never limitation engine torque, when vehicle needs to climb, vehicle Speed is substantially reduced, if carrying out engine torque limit at this moment, consequence is very serious.
Therefore, it is necessary to identify to vehicle climbing, engine torque limit is prevented.
Summary of the invention
The present invention to solve the above-mentioned problems, proposes a kind of method of OBD torque limit when preventing engine from climbing, this Method is sentenced by the liquid level slope characteristic that each class I liquid I such as urea level, fuel oil, machine oil has in engine climbing, descending Disconnected engine climb and fall, to release engine torque limit.
To achieve the goals above, the present invention adopts the following technical scheme:
A method of liquid level sensor is arranged in urea box side, adopts by OBD torque limit when preventing engine from climbing Collect liquid level variable quantity in urea box, assert that engine is being climbed if variable quantity is greater than calibration value, engine is forbidden to carry out OBD Torque limit.
The liquid level sensor be arranged in the cabinet edge of urea box to the position away from edge one third cabinet length it Between.
Liquid level variable quantity is filtered, by filtering export-restriction in setting range, filters out minor fluctuations or brief fluctuations.
The urea box replaces with fuel tank.
The urea box replaces with sump.
When side of the cabinet close to Chinese herbaceous peony end is arranged in liquid level sensor, liquid level variable quantity replaces with residual liquid quantity.
When position of the cabinet far from Chinese herbaceous peony end is arranged in liquid level sensor, liquid level variable quantity replaces with level value.
It needs to demarcate filtering time when filtering, method particularly includes: simulating vehicle acceleration and deceleration acquire the letter of urea level variation Number, gradually changes filtering time, until suitable filtering time can remove liquid fluctuating caused by vehicle acceleration and deceleration.
The invention has the benefit that
(1) control logic of the invention is simple, and calculation amount is small, is swift in response, accuracy of judgement；
(2) present invention is small for body construction change, cost input is small；
(3) liquid that the present invention has by each class I liquid I such as urea level, fuel oil, machine oil in engine climbing, descending Face slope characteristic judges engine climb and fall, to release engine torque limit.
Detailed description of the invention
Urea box schematic diagram when Fig. 1 is engine normally travel of the invention；
Urea box schematic diagram when Fig. 2 is engine climbing of the invention；
Fig. 3 is that urea level PT of the invention filters schematic diagram；
Fig. 4 is of the invention to judge whether engine climbs flow diagram.
Wherein: 1, sensor；2, urea box；3, urea liquid.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
It is illustrated by taking urea box as an example.
The present invention need to only change urea temperature liquid level sensor 1 on the basis of not increasing additional hardware and sensor Installation site, identifies whether engine climbs by control strategy.
The specific method is as follows: the installation site of urea liquid level and temperature sensor 1 being moved at B from the A of Fig. 1, this hair Bright 2 liquid level of urea box when being climbed with engine is illustrated as shown in Figure 2.When engine is climbed, urea box 2 has centainly with domatic Inclination, but the liquid level of urea liquid 3 is parallel with horizontal plane always, so that 3 liquid level of urea liquid and 2 wall surface of urea box form one The angle of a on-right angle causes the urea level of urea level temperature sensor measurement to increase, to judge engine at this time Climbing.
It is that A is moved to B by the position of urea level temperature sensor 1, can guarantees that the liquid level of cabinet has bright in climbing Aobvious variation.
Engine will also result in the fluctuation of urea level in acceleration and deceleration, but this temporary and small fluctuation can lead to It crosses urea level filtering to be handled, control strategy is as shown in Figure 3.
The measurement of urea level height (or surplus) is completed by urea level temperature sensor.When the stable row of engine It sails when in horizontal road, urea level does not change.But when the unexpected acceleration and deceleration of engine or climb and fall, urea level is had Variation.Level fluctuation caused by unexpected acceleration and deceleration be it is of short duration and small, liquid can be effectively removed using filter function (such as PT) Surface wave is dynamic.Demarcate filtering time method particularly includes: simulating vehicle acceleration and deceleration acquire the function of urea level variation Y1, simulate vehicle The function of climb and fall acquisition urea level variation Y2.Because influence of the climb and fall relative to automobile acceleration and deceleration to urea liquid level exists It is longer in time factor that (climb and fall, liquid level transformation period are slightly long；Acceleration and deceleration, liquid level transformation period are of short duration), so filtering time T_PT is more more sensitive to Y1, is gradually increased filtering time, until suitable filtering time can be liquid caused by vehicle acceleration and deceleration The dynamic removal of surface wave, and the variation influence of the liquid level caused by vehicle climb and fall is smaller.
What the calibration value in Fig. 4 was arranged method particularly includes: when vehicle drives at a constant speed on horizontal road surface, urea level The changing value of (urea surplus) is 0；When setting vehicle and climbing inclination angle as 20 ° of slope, we do not allow vehicle because of exhaust emissions Cause OBD torque limit when climbing.When vehicle is climbed, urea level after observation filter (or filtered urea is surplus Surplus) changing value, record this value.Setting value is only slightly more a little bit smaller than the numerical value of record.
When filtered urea level or urea surplus are greater than calibration value, then it may determine that engine is being climbed, The signal-inhibiting engine of output carries out OBD torque limit；Control strategy is not as shown in figure 4, conversely, then vehicle is climbed.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.

Claims (8)

1. a kind of method of OBD torque limit when preventing engine from climbing, it is characterized in that: being arranged liquid level sensor in urea box Side, liquid level variable quantity in urea box when acquisition is climbed, assert that engine is being climbed if variable quantity is greater than calibration value, forbids Engine carries out OBD torque limit.
2. the method for a kind of OBD torque limit when preventing engine from climbing as described in claim 1, it is characterized in that: the liquid Level sensor is arranged between cabinet edge to the position away from edge one third cabinet length of urea box.
3. the method for a kind of OBD torque limit when preventing engine from climbing as described in claim 1, it is characterized in that: to liquid level Variable quantity is filtered, and by filtering export-restriction in setting range, filters out minor fluctuations or brief fluctuations.
4. the method for a kind of OBD torque limit when preventing engine from climbing as described in claim 1, it is characterized in that: working as liquid level When side of the cabinet close to Chinese herbaceous peony end is arranged in sensor, liquid level variable quantity replaces with residual liquid quantity.
5. the method for a kind of OBD torque limit when preventing engine from climbing as described in claim 1, it is characterized in that: working as liquid level When position of the cabinet far from Chinese herbaceous peony end is arranged in sensor, liquid level variable quantity replaces with level value.
6. a kind of method of OBD torque limit when preventing engine from climbing according to any one of claims 1 to 5, feature Be: the urea box replaces with fuel tank.
7. a kind of method of OBD torque limit when preventing engine from climbing according to any one of claims 1 to 5, feature Be: the urea box replaces with sump.
8. the method for a kind of OBD torque limit when preventing engine from climbing as claimed in claim 3, it is characterized in that: when filtering It needs to demarcate filtering time, method particularly includes: simulating vehicle acceleration and deceleration acquire the function of urea level variation, gradually change filtering Time, until suitable filtering time can remove liquid fluctuating caused by vehicle acceleration and deceleration.
CN201610975854.0A 2016-11-07 2016-11-07 A method of OBD torque limit when preventing engine from climbing Active CN106401771B (en)

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107191510B (en) * 2017-07-01 2021-01-22 苏州埃博斯电气有限公司 Automatic switching device for two-wheel drive and four-wheel drive of vehicle
CN111963287B (en) * 2020-08-21 2022-04-29 中国重汽集团济南动力有限公司 OBD interaction system, method and device for vehicle engine and post-processing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09109722A (en) * 1995-10-16 1997-04-28 Nissan Diesel Motor Co Ltd Differential limiting controller
JP2005171816A (en) * 2003-12-09 2005-06-30 Nissan Motor Co Ltd Traction control device of vehicle
US7452306B2 (en) * 2005-03-21 2008-11-18 Caterpillar Inc. Drive system having slip control
CN102050119A (en) * 2009-10-29 2011-05-11 上海通用汽车有限公司 Method for achieving automatic transmission (AT) low-speed mode on vehicle equipped with automated manual transmission
CN203146112U (en) * 2013-03-15 2013-08-21 广西玉柴机器股份有限公司 OBD torque limit system of electronic-controlled engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6126964B2 (en) * 2013-10-03 2017-05-10 株式会社Kcm Work vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09109722A (en) * 1995-10-16 1997-04-28 Nissan Diesel Motor Co Ltd Differential limiting controller
JP2005171816A (en) * 2003-12-09 2005-06-30 Nissan Motor Co Ltd Traction control device of vehicle
US7452306B2 (en) * 2005-03-21 2008-11-18 Caterpillar Inc. Drive system having slip control
CN102050119A (en) * 2009-10-29 2011-05-11 上海通用汽车有限公司 Method for achieving automatic transmission (AT) low-speed mode on vehicle equipped with automated manual transmission
CN203146112U (en) * 2013-03-15 2013-08-21 广西玉柴机器股份有限公司 OBD torque limit system of electronic-controlled engine

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