GB2580979A - Method of torque and acceleration monitoring in a vehicle - Google Patents
Method of torque and acceleration monitoring in a vehicle Download PDFInfo
- Publication number
- GB2580979A GB2580979A GB1901487.7A GB201901487A GB2580979A GB 2580979 A GB2580979 A GB 2580979A GB 201901487 A GB201901487 A GB 201901487A GB 2580979 A GB2580979 A GB 2580979A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acceleration
- torque
- vehicle
- monitoring
- excessive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000001133 acceleration Effects 0.000 title abstract description 60
- 238000012544 monitoring process Methods 0.000 title abstract description 38
- 238000000034 method Methods 0.000 title abstract description 20
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 230000001419 dependent effect Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract 2
- 230000003466 anti-cipated effect Effects 0.000 abstract 1
- 230000009471 action Effects 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
Classifications
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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
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D11/107—Safety-related aspects
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
- B60W2520/105—Longitudinal acceleration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/02—Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
- F02D2200/501—Vehicle speed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Disclosed is a method of monitoring a vehicle, the vehicle including an internal combustion engine. The method comprises monitoring the acceleration of the vehicle and determining if there is excessive acceleration or not; monitoring the torque developed by the engine and determining if there is excessive torque or not; flagging or not flagging a fault condition dependent on the results. The method provides a means to rapidly and accurately determine an engine fault where acceleration deviates from the intended acceleration. In some instances if the acceleration is higher than anticipated then this could be due to the vehicle accelerating downhill and the excess toque measurement is used to eliminate this possibility. In other instances the excess torque determination can provide quicker means of detecting a fault than waiting for a measurement of the rate of vehicle acceleration. Also disclosed is a system for detecting a fault in a vehicle. The combination of the two methods of fault detection in a single system provide a more robust arrangement than either system used independently.
Description
Method of Torque and Acceleration Monitoring in a Vehicle
TECHNICAL FIELD
This relates to a method of monitoring torque and acceleration in a vehicle.
BACKGROUND OF THE INVENTION
Preventing unwanted acceleration is done currently either by acceleration based monitoring or continuous torque monitoring.
To prevent unwanted vehicle acceleration, two main methodologies are used in prior art. One is torque monitoring of the vehicle engine; this method is complex to develop and focuses only on engine torque while a slight overshoot of engine torque will have no effect on vehicle dynamic. The other is vehicle acceleration monitoring; this method is simple and is more resilient to small, irrelevant torque error. However when driving e.g. down a slope, it is not possible to differentiate between acceleration due to the slope or unwanted acceleration from the engine without adding an inclination sensor.
So many prior art systems require an inclination sensor, or monitoring air filling inside the engine along with acceleration monitoring concept. In case of excessive acceleration, for instance in a slope, actions are taken only if an excessive amount of air inside the engine is suspected.
When using acceleration monitoring or torque monitoring there is a need to set high detection thresholds for excessive acceleration detection. This leads to higher and longer excessive acceleration before system reaction Patent US9460628 describes a method and device for preventing unintentional acceleration of a motor vehicle. US6919801B2 describes a vehicle safety system for preventing inadvertent acceleration of a vehicle. US8775046B2 describes an unintended acceleration detection and correction, and US8548712B2 describes an acceleration-based safety monitoring of a drive of a motor vehicle.
It is an object of the invention to overcome these problems and include a methodology which does not include an inclination sensor.
SUMMARY OF THE INVENTION
In one aspect is provided a method of monitoring a vehicle, said vehicle including an internal combustion engine; comprising: a) monitoring the acceleration of the vehicle, and determining if there is excessive acceleration or not; b) monitoring the torque developed by the engine, and determining if there is excessive torque or not; c) flagging or not flagging a fault condition dependent on the results of steps a) and b) . The method may include the step of d) controlling said vehicle to take remedial action of a fault is flagged in step c) Step a) may comprise determining if the acceleration is above a threshold level.
Step b) may comprise determining the undershoot or overshoot of torque, comparing this with a threshold and determining excess torque bases on In step a) it is determined there is no excessive acceleration and in step b) it is determined that there is excessive torque, then step d) comprises controlling the vehicle engine to limit the torque produced.
If in step a) it is determined there is no excessive acceleration and in step b) it is determined there is excessive torque, then step d) may comprise controlling the vehicle engine to limit the torque produced.
If in step a) it is determined there is excessive acceleration and in step b) it is determined there is no excessive torque then in step c) not fault may be flagged and/or step d) no action is taken
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the 10 accompanying drawing in which: -Figure 1 shows a flow chart of the methodology according to one example.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In one aspect of the invention acceleration and torque monitoring is performed.
In one example acceleration based monitoring is running all the time and torque monitoring is activated only if acceleration monitoring has detected an excessive acceleration.
In case of normal driving situation, if the torque monitoring detects a small excessive torque but the vehicle acceleration monitoring does not detect excessive acceleration then the situation is safe and no action is taken. On the contrary if torque monitoring detects a high excessive torque then we can predict an excessive acceleration. The acceleration may not yet have occurred because of vehicle inertia. As a consequence, actions may be taken to limit engine torque depending on the degrees of excessive torque.
In this way a less complex torque monitoring method is provided because the inconsequential over/undershoots of torque a safety point of view will be ignored.
In case of acceleration monitoring if excessive acceleration is detected, the torque monitoring may be used to confirm the unwanted acceleration as follows if the torque monitoring does not detect any error on engine torque then it means that the car is accelerating because it is going downhill and no action to control it is necessary. On the contrary if torque monitoring detects excessive torque then the ongoing acceleration detected is indeed unexpected and actions to limit it should be taken to bring back the vehicle in a safe situation. Thanks to that strategy neither the inclination sensor is necessary anymore nor is there a need to set high detection threshold to avoid detecting downhill situation.
Figure 1 shows a flow chart illustrating methodology of the invention. Within the flowchart are shown three sub-methods which may be performed on their own.
Acceleration monitoring occur in step S1. On the left hand side of the figure in step S2 acceleration monitoring detects an excessive acceleration (i.e. above a threshold).
In one example measured acceleration is compared to expected acceleration. The expected acceleration may be measured from torque output or torque demand (in a closed loop system) along with other parameters such as vehicle mas. The skilled person would be able to determine from estimation or testing what the threshold for "excessive" may be. In examples (vehicle reaction test) curves may be utilized to determine maximum duration of an excessive acceleration before action are taken.
Subsequent or concurrent torque monitoring is performed and in step S3 there is detected excessive torque. This may be torque undershoot or overshoot i.e. the amount the actual or measured torque is away from the demand torque; (i.e. measured torque is compared to the engine demand in a closed loop control system which compares its torque output to its torque demand In this case excessive torque depends on the torque estimator we use. If e.g. torque estimation is accurate down to 10Nm; 20Nm is then a reasonable excessive torque value because we can clearly deduce that a 30Nm over/undershoot is not only caused by bad torque estimation. On the contrary with a simplified torque estimator then we might have 25Nm accuracy which means excessive torque is then 50Nm A conclusion in step S4 is that unwanted acceleration is present -excessive acceleration is caused by excessive torque. Consequently in step S5 action may be taken to limit the torque.
If there is no excessive torque after excessive acceleration had been detected at step S6 then a conclusion at step S7 may be that there is a downhill situation and excessive acceleration is caused by the downhill slope. At step S8 it is decided no consequential action is taken.
On the right hand side at step S9 no excessive acceleration if detected. The torque monitoring either detects excessive torque (e.g. above a threshold) at step S10 or no excessive torque at step S11. If there is no excessive torque then at step S12 it is assumed normal driving conditions and at step S13 it is concluded no action is to be taken.
If excess torque has been detected at S10, it is decided whether excess torque (torque overshoot or undershoot) is below or above a threshold (e.g. 50Nm). If this is below a threshold at step S14 then at step S15 the excessive torque is ignored as it is concluded that the error in torque (excess) is to small to have an impact on e.g. vehicle acceleration. At step S16 it is concluded no consequential action is to be performed.
If the excess torque (torque overshoot or undershoot) is above a threshold (e.g. 50Nm) at step S17, then it is decided at step S18 that the excessive torque is dangerous and that vehicle acceleration may soon become dangerous. At step S19 action is taken to limit the torque produced.
In contrast to the prior art this methodology does not need an additional sensor to achieve unwanted acceleration detection in all situations or a specific monitoring of engine air charge; so the advantage is that it is not using any additional sensors without infringing on safety by setting high detection thresholds.
It is also an improvement compared to the prior act as it allows a better detection of an unexpected acceleration in a context of a downhill situation. Indeed by design the torque monitoring is also taking into account the unexpected acceleration due to spark ignition timing alteration while the air charge based detection doesn't consider it.
It also eases the torque monitoring development process as it doesn't need to be active all the time. It makes it more resilient to faulty or irrelevant detection of excessive torque situation as it is used in conjunction with the acceleration monitoring
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1901487.7A GB2580979A (en) | 2019-02-04 | 2019-02-04 | Method of torque and acceleration monitoring in a vehicle |
PCT/EP2020/052739 WO2020161127A1 (en) | 2019-02-04 | 2020-02-04 | Method of torque and acceleration monitoring in a vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1901487.7A GB2580979A (en) | 2019-02-04 | 2019-02-04 | Method of torque and acceleration monitoring in a vehicle |
Publications (2)
Publication Number | Publication Date |
---|---|
GB201901487D0 GB201901487D0 (en) | 2019-03-27 |
GB2580979A true GB2580979A (en) | 2020-08-05 |
Family
ID=65996925
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1901487.7A Withdrawn GB2580979A (en) | 2019-02-04 | 2019-02-04 | Method of torque and acceleration monitoring in a vehicle |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2580979A (en) |
WO (1) | WO2020161127A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2222894A (en) * | 1988-04-30 | 1990-03-21 | Fuji Heavy Ind Ltd | Safety system for ic engine |
US6061623A (en) * | 1998-07-17 | 2000-05-09 | Ford Global Technologies, Inc. | Method and system for pre-positioning wheel torque in a torque based vehicle speed control |
US6368248B1 (en) * | 1999-06-22 | 2002-04-09 | Robert Bosch Gmbh | Method and device for controlling a drive unit of a vehicle |
JP2011149312A (en) * | 2010-01-20 | 2011-08-04 | Honda Motor Co Ltd | Control device of internal combustion engine |
US20140172253A1 (en) * | 2012-12-19 | 2014-06-19 | Caterpillar Inc. | System and method for controlling a transmission |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003065140A (en) * | 2001-08-29 | 2003-03-05 | Yamaha Motor Co Ltd | Engine control device |
US6919801B2 (en) | 2003-10-06 | 2005-07-19 | Jae Yeal Kim | Vehicle safety system for preventing inadvertent acceleration of a vehicle |
DE102011075609A1 (en) | 2011-05-10 | 2012-11-15 | Bayerische Motoren Werke Aktiengesellschaft | Acceleration-based safety monitoring of a drive of a motor vehicle |
US8775046B2 (en) | 2011-09-01 | 2014-07-08 | Robert Bosch Gmbh | Unintended acceleration detection and correction |
DE102013107781B4 (en) * | 2013-07-22 | 2018-04-26 | Bayerische Motoren Werke Aktiengesellschaft | Method and device for preventing unwanted acceleration of a motor vehicle |
JP2017203393A (en) * | 2016-05-10 | 2017-11-16 | スズキ株式会社 | Vehicle control device |
DE102016219315B4 (en) * | 2016-10-05 | 2018-06-21 | Continental Automotive Gmbh | Method and device for avoiding unwanted acceleration of a motor vehicle |
-
2019
- 2019-02-04 GB GB1901487.7A patent/GB2580979A/en not_active Withdrawn
-
2020
- 2020-02-04 WO PCT/EP2020/052739 patent/WO2020161127A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2222894A (en) * | 1988-04-30 | 1990-03-21 | Fuji Heavy Ind Ltd | Safety system for ic engine |
US6061623A (en) * | 1998-07-17 | 2000-05-09 | Ford Global Technologies, Inc. | Method and system for pre-positioning wheel torque in a torque based vehicle speed control |
US6368248B1 (en) * | 1999-06-22 | 2002-04-09 | Robert Bosch Gmbh | Method and device for controlling a drive unit of a vehicle |
JP2011149312A (en) * | 2010-01-20 | 2011-08-04 | Honda Motor Co Ltd | Control device of internal combustion engine |
US20140172253A1 (en) * | 2012-12-19 | 2014-06-19 | Caterpillar Inc. | System and method for controlling a transmission |
Also Published As
Publication number | Publication date |
---|---|
GB201901487D0 (en) | 2019-03-27 |
WO2020161127A1 (en) | 2020-08-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |