CN101825496B - Device for calculating temperature substitute value of engine temperature sensor - Google Patents
Device for calculating temperature substitute value of engine temperature sensor Download PDFInfo
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- CN101825496B CN101825496B CN2010101628749A CN201010162874A CN101825496B CN 101825496 B CN101825496 B CN 101825496B CN 2010101628749 A CN2010101628749 A CN 2010101628749A CN 201010162874 A CN201010162874 A CN 201010162874A CN 101825496 B CN101825496 B CN 101825496B
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- 238000004364 calculation method Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 abstract description 15
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000006467 substitution reaction Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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Abstract
The invention discloses an arithmetic method for obtaining a temperature substitute value when a temperature sensor of an automobile engine goes out of order, which belongs to the field of automobile engines. The method comprises the following steps of: obtaining a first cycle temperature of the engine; calculating the temperature difference between first and second cycles of the engine according to the first cycle temperature and the rotating speed of the engine; and calculating the temperature substituent value of the second cycle according to the first cycle temperature and the temperature difference. The method can provide the temperature substitute value which is close to the actual temperature value as much as possible, so that the situations of influence on the normal starting of the vehicle, high oil consumption and high emission when the temperature substitute value exceeds a permissible error are prevented when the temperature sensor of the engine goes out of order, and the vehicle can work normally and meet requirements on environmental protection.
Description
Technical field
The present invention relates to the motor car engine field, particularly during the engine temperature sensing unit fault, the computing method of temperature substitute value and device.
Background technology
Temperature sensor in the automobile engine system plays an important role in the starting process of automobile.Temperature sensor is through converting the temperature value that measures into electric signal, thus the size of distributive value during the Control of Automobile starting.Temperature height then distributive value is little, and temperature is low, and then distributive value is big.When temperature sensor breaks down, need a temperature substitute value and come the support vehicles can normal starting.
Usually adopt two kinds of disposal routes to obtain temperature substitute value in the prior art, a kind of method is directly to set the substitution value of a steady state value as temperature.Another kind method is under the situation that temperature sensor breaks down, and cranking temperature still carries out value according to sensor signal, draws temperature value.
The inventor finds that there is following shortcoming at least in prior art in realizing process of the present invention:
For first method, substitution value is than the actual temperature value of automobile, if set higher, in the time of can causing starting oil spout rare excessively, the situation that influence such as vehicle shake is driven appears; If set on the low sidely, can cause oil spout too much, high consumption oil appears, the situation of maximum discharge.For second method, temperature value still adds up according to the calculated signals value of sensor output, promptly on the basis of mistake, adds up, and temperature value that draws thus and actual value be deviation to some extent, and the starting to automobile impacts equally.
Summary of the invention
In order to solve in the prior art temperature substitute value and actual value deviation to some extent, influence the starting of automobile, cause high consumption oil simultaneously, the problem of maximum discharge, the algorithm of temperature substitute value when the invention discloses a kind of engine temperature sensing unit fault.Said technical scheme is following:
Obtain engine first circulating temperature; According to said first circulating temperature and engine speed, calculation engine starting back first circulation and the second round-robin temperature difference; According to said first circulating temperature and temperature difference, calculate the said second round-robin temperature substitute value.
Said engine first circulating temperature of obtaining; Specifically comprise: obtain modified value, the characteristic relation that temperature when said modified value was shut down according to last time and temperature reduced with stop time draws; Temperature deducts said modified value and obtains said first circulating temperature in the time of will shutting down last time.
Said temperature with the characteristic relation that reduces stop time by actual vehicle repeatedly image data draw.
Said according to said first circulating temperature and engine speed, calculation engine starting back first circulation and the second round-robin temperature difference; Specifically comprise: with the characteristic relation that the rotating speed and first circulating temperature rise, obtain said temperature difference through the inquiry temperature difference.
Said temperature difference with rotating speed and cocycle temperature rising characteristic table by actual vehicle repeatedly image data draw.
According to said first circulating temperature and temperature difference, calculate the said second round-robin temperature substitute value, specifically comprise: with said first circulating temperature add the above first the circulation and the second round-robin temperature difference obtain the said second round-robin temperature substitute value.
A temperature upper limit is set,, adopts said higher limit as temperature substitute value when temperature substitute value during greater than higher limit.
A kind of device of accounting temperature substitution value, said device comprises: the first circulating temperature acquisition module: be used to obtain engine first circulating temperature; Temperature difference computing module: be used for according to said first circulating temperature and engine speed calculation engine starting back first circulation and the second round-robin temperature difference; Temperature substitute value computing module: be used for according to said first circulating temperature and temperature difference, calculate the said second round-robin temperature substitute value.
The first circulating temperature acquisition module specifically comprises: the modified value acquiring unit: be used to obtain modified value, the characteristic relation that temperature when said modified value was shut down according to last time and temperature reduced with stop time draws; The first circulating temperature computing unit: temperature deducts said modified value and obtains said first circulating temperature when being used for shut down last time.
The temperature difference computing module specifically is used for: with the characteristic relation that the rotating speed and first circulating temperature rise, obtain said temperature difference through the inquiry temperature difference.
The temperature substitute value computing module specifically is used for: with said first circulating temperature add the above first the circulation and the second round-robin temperature difference obtain the said second round-robin temperature substitute value.
Said temperature substitute value computing module also comprises substituting unit: be used to be provided with a temperature upper limit, when temperature substitute value during greater than higher limit, adopt said higher limit to substitute as temperature
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: temperature substitute value accurately simulates the measured value of temperature sensor; Vehicle can be worked according to substitution value under the situation that temperature sensor breaks down normally, avoided substitution value higher, oil spout is rare excessively when causing starting; Situation and substitution value that influence driving such as vehicle shake occur are on the low side; Cause oil spout too much, high consumption oil occurs, the situation of maximum discharge.Make vehicle guarantee good cornering ability, reach environmental protection requirement simultaneously.
Description of drawings
Fig. 1 is the process flow diagram of the computing method of a kind of temperature substitute value of providing in the embodiment of the invention;
Fig. 2 is the characteristic relation figure that the temperature that provides in the embodiment of the invention reduced with stop time;
Temperature value schematic diagram calculation when Fig. 3 is the engine start that provides in the embodiment of the invention;
Fig. 4 is latter two round-robin temperature difference schematic diagram calculation of engine start that provides in the embodiment of the invention;
Substitution value schematic diagram calculation when Fig. 5 is the engine temperature sensing unit fault that provides in the embodiment of the invention.
Fig. 6 is the apparatus structure synoptic diagram of a kind of accounting temperature substitution value of providing in the embodiment of the invention;
Fig. 7 is another structural representation of device of a kind of accounting temperature substitution value of providing in the embodiment of the invention;
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Embodiment 1
Referring to Fig. 1, present embodiment provides a kind of computing method of temperature substitute value, comprising:
101: the calculation engine first round-robin temperature value;
Wherein, the temperature when said first circulation can be engine start also can be any round-robin temperature after the engine start.
Wherein, circulation refers to a period of time interval τ; Temperature when the temperature during engine start was shut down by last time and stop time Influence of Temperature is drawn is referring to Fig. 2, that is:
Temperature-modified value when first round-robin was shut down temperature value=last time
Wherein, modified value be stop time to the Influence of Temperature value, referring to Fig. 3, be the property list that temperature reduced with stop time, the transverse axis representation temperature, the longitudinal axis is represented stop time.Can draw said modified value through the inquiry temperature with the characteristic relation that reduces stop time, for example, be t when vehicle launch
0In the time of constantly, corresponding temperature reduction value is T.Particularly, this characteristic relation can be a property list.Wherein, temperature with the property list that reduces stop time by actual vehicle repeatedly image data draw, that is: after normal vehicle was shut down, record stop time and temperature variation were made property list and are demarcated on real vehicle as said modified value.Afterwards this table is verified; For example: rolling motor;, temperature shuts down starting after 30 minutes when reaching 70 °; Check when starting temperature with the error amount of the temperature of using said modified value to calculate, if error amount is revised property list not in allowed limits then repeat the step that above-mentioned making property list is fixed at the enterprising rower of real vehicle and verify.Because the too high temperature that may cause of oil temperature increases, but consider the uncontrollability of increase trend when it should be noted that firm shutdown, this property list is ignored this situation, and error can be little to the high-temperature start-up influence at 3 °.
Certainly, the temperature value during engine start also can draw through estimation.
102: calculation engine starting back first circulation and the second round-robin temperature difference;
Wherein, Said first circulation and the second round-robin temperature difference can be the temperature in when starting and a round-robin temperature difference thereafter; Also can be any adjacent two round-robin temperature differences, the temperature value that promptly records after the n time circulation deducts the temperature value that records after the n-1 time circulation.
Wherein, the rotating speed of said temperature difference and engine is relevant with the temperature value of cocycle, and referring to Fig. 4, temperature difference is specially property list with the characteristic relation that rotating speed and cocycle temperature raise.Wherein, the transverse axis representation temperature is poor, two input values is arranged, first circulating temperature, engine speed on the longitudinal axis.According to these two the corresponding property lists of value inquiry, obtain corresponding temperature difference.
Property list be according to actual vehicle repeatedly image data draw.That is: the relation of record temperature difference and rotating speed and cocycle temperature under the trouble-free situation of temperature sensor is made property list, and is fixed at the enterprising rower of actual vehicle.Make the engine temperature sensing unit fault; As pull out sensor; Difference when the starting vehicle is checked fuel injection signal, lambda value and starting performance and temperature sensor non-fault; If not in the scope of error then repeat the step of above-mentioned making property list and checking fixed, property list is revised at the enterprising rower of real vehicle.
Should guarantee when on actual vehicle, demarcating property list the temperature accumulated value reach the highest time will be longer than underload, idling the time temperature rise to time of peak, and overtime can not be greater than 3 minutes.
Wherein, because vehicle is different, differences such as liquid coolant, car weight all can influence ascendant trend, so different to the different automobile types property list.
103: calculate the second round-robin temperature substitute value after the engine start.
Wherein, said second circulates is relative first circulation, promptly can be next circulation of arbitrary round-robin; Temperature value+two round-robin temperature differences that second circulating temperature substitution value=cocycle is calculated.
Wherein, through n circulation time, the temperature value that cocycle is calculated is got by the accumulation calculating of n-1 time two circulating temperature difference and cocycle temperature value before after the engine start.
Because engine temperature value in the process of starting generally can not surpass a maximal value, thus a temperature upper limit will be set herein, when temperature substitute value will adopt higher limit as substitution value during greater than higher limit.
Referring to Fig. 5, vehicle is in the substitution value of starting cross reference different characteristic table accounting temperature, draws final temperature substitute value through adding up and comparing with higher limit at last.
Present embodiment provides method, through actual vehicle repeatedly image data obtain modified value characteristic relation and temperature difference with rotating speed and cocycle temperature rising characteristic relation, calculate engine first circulating temperature; First circulates and the second round-robin temperature difference and the second circulating temperature substitution value, accurately simulates the measured value of temperature sensor, and vehicle can be worked according to substitution value under the situation that temperature sensor breaks down normally; Avoided substitution value higher; Oil spout is rare excessively when causing starting, and it is on the low side situation and substitution value that influence such as vehicle shake drives to occur, causes oil spout too much; High consumption oil appears, the situation of maximum discharge.Make vehicle guarantee good cornering ability, reach environmental protection requirement simultaneously.
Embodiment 2
Referring to Fig. 6, present embodiment provides a kind of device of accounting temperature substitution value, and device comprises:
The first circulating temperature acquisition module 201: be used to obtain engine first circulating temperature;
Temperature difference computing module 202: be used for according to said first circulating temperature and engine speed calculation engine starting back first circulation and the second round-robin temperature difference;
Temperature substitute value computing module 203: be used for according to said first circulating temperature and temperature difference, calculate the said second round-robin temperature substitute value.
Wherein, referring to Fig. 7, the first circulating temperature acquisition module 201 specifically comprises:
Modified value acquiring unit 201a: be used to obtain modified value, the characteristic relation that temperature when said modified value was shut down according to last time and temperature reduced with stop time draws;
The first circulating temperature computing unit 201b: temperature deducts said modified value and obtains said first circulating temperature when being used for shut down last time.
Wherein, said temperature difference computing module 202 specifically is used for: with the characteristic relation that the rotating speed and first circulating temperature rise, obtain said temperature difference through the inquiry temperature difference.
Wherein, said temperature substitute value computing module 203 specifically is used for: with said first circulating temperature add the above first the circulation and the second round-robin temperature difference obtain the said second round-robin temperature substitute value.
Temperature substitute value computing module 203 also comprises, substituting unit 203a: be used to be provided with a temperature upper limit, when temperature substitute value during greater than higher limit, adopt said higher limit as temperature substitute value.
The device that present embodiment provides belongs to same design with method embodiment, and its concrete implementation procedure sees method embodiment for details, repeats no more here.
The device that present embodiment provides, through actual vehicle repeatedly image data obtain modified value characteristic relation and temperature difference with rotating speed and cocycle temperature rising characteristic relation, calculate engine first circulating temperature; First circulates and the second round-robin temperature difference and the second circulating temperature substitution value, accurately simulates the measured value of temperature sensor, and vehicle can be worked according to substitution value under the situation that temperature sensor breaks down normally; Avoided substitution value higher; Oil spout is rare excessively when causing starting, and it is on the low side situation and substitution value that influence such as vehicle shake drives to occur, causes oil spout too much; High consumption oil appears, the situation of maximum discharge.Make vehicle guarantee good cornering ability, reach environmental protection requirement simultaneously.
All or part of content in the technical scheme that above embodiment provides can realize that through software programming its software program is stored in the storage medium that can read, storage medium for example: the hard disk in the computing machine, CD or floppy disk.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the device of the temperature substitute value of a calculation engine temperature sensor is characterized in that, said device comprises:
The first circulating temperature acquisition module: it is to calculate through obtaining modified value again; Said modified value is that temperature and the temperature when shutting down according to last time draws with the characteristic relation that reduces stop time; So the temperature that will shut down last time deducts said modified value, can obtain engine first circulating temperature;
The temperature difference computing module: be to be used for according to said first circulating temperature and engine speed, through the characteristic relation that the inquiry temperature difference rises with the rotating speed and first circulating temperature, calculation engine starting back first circulation and the second round-robin temperature difference;
Temperature substitute value computing module: be the temperature difference that is used for according to said first circulating temperature and first circulating temperature and second circulating temperature, calculate the said second round-robin temperature substitute value.
2. device as claimed in claim 1 is characterized in that, is used for the acquisition module of engine first circulating temperature, specifically comprises:
The modified value acquiring unit: be used to obtain modified value, the characteristic relation that temperature when said modified value was shut down according to last time and temperature reduced with stop time draws;
The first circulating temperature computing unit: temperature deducts said modified value and obtains said first circulating temperature when being used for shut down last time.
3. device as claimed in claim 1 is characterized in that, the temperature difference computing module specifically is used for:
According to said first circulating temperature and engine speed, with the characteristic relation that the rotating speed and first circulating temperature rise, obtain said temperature difference through the inquiry temperature difference.
4. device as claimed in claim 1 is characterized in that, the temperature substitute value computing module specifically is used for:
With said first circulating temperature add the above first the circulation and the second round-robin temperature difference obtain the said second round-robin temperature substitute value.
5. device as claimed in claim 4 is characterized in that, said temperature substitute value computing module also comprises:
Substituting unit: be used to be provided with a temperature upper limit,, adopt said higher limit as temperature substitute value when temperature substitute value during greater than higher limit.
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| CN2010101628749A CN101825496B (en) | 2010-05-04 | 2010-05-04 | Device for calculating temperature substitute value of engine temperature sensor |
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| CN2010101628749A CN101825496B (en) | 2010-05-04 | 2010-05-04 | Device for calculating temperature substitute value of engine temperature sensor |
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| CN101825496B true CN101825496B (en) | 2012-09-05 |
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| CN104933226B (en) * | 2015-05-26 | 2019-02-22 | 奇瑞汽车股份有限公司 | A kind of control calculation method of engine motor oil temperature |
Citations (4)
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|---|---|---|---|---|
| CN1576552A (en) * | 2003-07-08 | 2005-02-09 | 日产自动车株式会社 | Start-up control of in-cylinder fuel injection spark ignition internal combustion engine |
| US6908225B2 (en) * | 2003-02-20 | 2005-06-21 | Honda Motor Co., Ltd. | Failure diagnosing apparatus for an engine cooling water temperature sensor |
| CN101040111A (en) * | 2004-10-07 | 2007-09-19 | 丰田自动车株式会社 | Fuel supply apparatus for internal combustion engine |
| US7534033B2 (en) * | 2004-12-10 | 2009-05-19 | Siemens Aktiengesellschaft | Method and device for checking temperature values of a temperature sensor of a combustion engine |
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- 2010-05-04 CN CN2010101628749A patent/CN101825496B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6908225B2 (en) * | 2003-02-20 | 2005-06-21 | Honda Motor Co., Ltd. | Failure diagnosing apparatus for an engine cooling water temperature sensor |
| CN1576552A (en) * | 2003-07-08 | 2005-02-09 | 日产自动车株式会社 | Start-up control of in-cylinder fuel injection spark ignition internal combustion engine |
| CN101040111A (en) * | 2004-10-07 | 2007-09-19 | 丰田自动车株式会社 | Fuel supply apparatus for internal combustion engine |
| US7534033B2 (en) * | 2004-12-10 | 2009-05-19 | Siemens Aktiengesellschaft | Method and device for checking temperature values of a temperature sensor of a combustion engine |
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