CN116006338B - Control method and device for electronic injection system of range-extending engine and vehicle - Google Patents
Control method and device for electronic injection system of range-extending engine and vehicle Download PDFInfo
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- CN116006338B CN116006338B CN202310083902.5A CN202310083902A CN116006338B CN 116006338 B CN116006338 B CN 116006338B CN 202310083902 A CN202310083902 A CN 202310083902A CN 116006338 B CN116006338 B CN 116006338B
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- 238000002347 injection Methods 0.000 title claims abstract description 27
- 239000007924 injection Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000446 fuel Substances 0.000 claims abstract description 93
- 238000011217 control strategy Methods 0.000 claims abstract description 26
- 230000010355 oscillation Effects 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 19
- 230000009471 action Effects 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003054 catalyst Substances 0.000 abstract description 10
- 230000000737 periodic effect Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a control method, a device and a vehicle of an electronic injection system of an extended range engine, wherein in the air-fuel ratio closed-loop control process, when the time of the extended range engine in a steady-state working condition exceeds a preset steady-state time t ss, if the mixed gas is not rich, an oscillation control strategy I is executed first, then the conventional control strategy is executed again, and if the mixed gas is rich, the oscillation control strategy II is executed first, and then the conventional control strategy is executed again. The invention increases the process of periodic air-fuel ratio oscillation in the long-time steady-state working condition of the extended-range engine on the basis of conventional closed-loop control, can improve the conversion efficiency of the catalyst and ensures the emission consistency.
Description
Technical Field
The invention belongs to the field of automobile engine control, and particularly relates to a control method and device of an electronic injection system of a range-extended engine and a vehicle.
Background
At present, national emission and oil consumption regulations are stricter, and national Six Codes regulations and double integration policies are implemented, so that the reduction of oil consumption and the improvement of emission stability are not sustained. The range-extended electric vehicle is also an optimal scheme for realizing electric operation and solving the problem of endurance anxiety. The range-extending electric vehicle is characterized in that the engine is completely disconnected from the driving end, so that the operation condition of the engine is decoupled from the operation condition of the whole vehicle, the engine control strategy is very flexible, and a control mode of comprehensively balancing the emission oil consumption can be used.
In the rotating speed control of most of the range-extended engines at the present stage, point working condition control is adopted, a plurality of typical rotating speed load points (selected from the optimal oil consumption curves of the engine) are generally set, and under different driving working conditions, different steady-state point working conditions are adopted to ensure the emission, the charging power, the oil consumption and the like of the engine. However, if the vehicle runs at the same speed for a period of time, the engine is easy to keep running at the same speed and load for a steady state, the air-fuel ratio will be unchanged in the process, once the air-fuel ratio is controlled with a small error, the oxygen storage capacity of the catalyst will be operated to an extreme state after long-time running, the oxygen storage saturation or no-load of the catalyst will be caused, the oxygen storage capacity of the catalyst will not be relieved after the air-fuel mixture is too lean or too rich, the NOx or CO in the air-fuel mixture will not be catalyzed effectively, and the emission exceeds the standard.
Specifically, steady-state control of all the electronic injection systems at this stage employs a closed-loop control strategy, and the air-fuel ratio is controlled by a post-oxygen sensor installed in the exhaust pipe on the more upstream side than the three-way catalyst. For example, in the full-load working condition closed-loop control system of the electronic injection engine disclosed by CN202001122U, an electronic control unit judges the air-fuel ratio of the mixture actually entering the cylinder according to the change of the oxygen content in exhaust gas, compares the air-fuel ratio with a set target air-fuel ratio, corrects the fuel injection quantity according to the comparison result, finally keeps the air-fuel ratio near the set value, and has good power consistency and fuel consumption consistency of the engine. However, the signal of the rear oxygen sensor has small errors due to product differences, installation positions, operation conditions and the like, and the errors are amplified when the rear oxygen sensor operates stably for a long time, so that oxygen storage in the catalyst is saturated or emptied, and the oxygen storage effect cannot be continuously exerted. The working condition of the traditional engine is changed frequently, the problem is not needed to be considered, the range-extending engine is basically controlled by adopting the point working condition, the probability of running a single working condition point for a long time is greatly increased, and the problem becomes the problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a control method and device of an electronic injection system of an extended-range engine and a vehicle, so as to activate the deoxidization capability of a catalyst, improve the conversion efficiency and ensure the emission consistency.
The invention relates to a control method of an electronic injection system of a range-extending engine, which comprises the following steps:
In the air-fuel ratio closed-loop control process, when the time of the extended-range engine in a steady-state working condition exceeds a preset steady-state time t ss, if the gas mixture is not richer, executing the first oscillation control strategy, then resuming the conventional control strategy, and if the gas mixture is richer, executing the second oscillation control strategy, then resuming the conventional control strategy. Wherein,
The first oscillation control strategy is as follows: the target air-fuel ratio r=r mid+Rbias is maintained for the operation time t ac, and then the target air-fuel ratio r=r mid-Rbias is maintained for the operation time t ac, which is referred to as a cycle, and the cycle is repeated n times.
The second oscillation control strategy is as follows: the target air-fuel ratio r=r mid-Rbias is maintained for the operation time t ac, and then the target air-fuel ratio r=r mid+Rbias is maintained for the operation time t ac, which is referred to as a cycle, and the cycle is repeated n times.
The conventional control strategy is: the target air-fuel ratio r=r mid is made.
R mid denotes an air-fuel ratio median value, R bias denotes an air-fuel ratio median shift amount, and n denotes the number of cycles of air-fuel ratio shift control.
Preferably, according to the rotational speed and the load of the extended-range engine, a preset air-fuel ratio median offset table is queried to obtain the air-fuel ratio median offset R bias; the preset air-fuel ratio median deviation table is a corresponding relation table of the extended-range engine speed, the extended-range engine load and the air-fuel ratio median deviation amount obtained through calibration. The median offset of the air-fuel ratio is obtained by a table look-up mode, so that consistency of oscillation control can be better ensured.
Preferably, according to the rotation speed and the load of the extended-range engine, a preset action time table is inquired to obtain the action time t ac; the preset action time table is a corresponding relation table of the rotation speed of the extended-range engine, the load of the extended-range engine and the action time, which are obtained through calibration. The action time is obtained by a table look-up mode, and the consistency of oscillation control can be better ensured.
Preferably, according to the rotation speed and the load of the extended-range engine, a preset cycle number table is queried to obtain the cycle number n of the air-fuel ratio offset control; the preset cycle number table is a corresponding relation table of the rotation speed of the extended-range engine, the load of the extended-range engine and the cycle number of the air-fuel ratio offset control, which are obtained through calibration. The circulation times of the air-fuel ratio offset control are obtained through a table look-up mode, and the consistency of oscillation control can be better ensured.
Preferably, according to the rotation speed and the load of the extended-range engine, a preset air-fuel ratio median value table is queried to obtain the air-fuel ratio median value R mid; the preset air-fuel ratio median value table is a corresponding relation table of the extended-range engine speed, the extended-range engine load and the air-fuel ratio median value obtained through calibration. The median value of the air-fuel ratio is obtained in a table look-up mode, so that the consistency of conventional control can be better ensured.
Preferably, the preset steady-state time t ss is 100 ms-1000 ms, which can avoid long-time steady-state operation of the extended-range engine.
Preferably, if the engine speed variation Δn is less than the preset speed threshold n thr and the engine load variation Δpe is less than the preset load threshold Pe thr, it indicates that the engine is in steady state.
Preferably, if the voltage of the reactive oxygen content output by the post-oxygen sensor is smaller than or equal to a preset voltage threshold value, the mixed gas is not richer, otherwise, the mixed gas is richer.
Preferably, the preset rotation speed threshold n thr is 70 rpm-150 rpm, and the preset load threshold Pe thr is 2% -8%. 70 rpm-150 rpm and 2% -8% are relatively reasonable rotational speed threshold ranges and load threshold ranges for defining whether the extended-range engine is in a steady-state working condition.
Preferably, the value range of the preset voltage threshold is 420 mV-500 mV.420 mV-500 mV is a voltage threshold range which reasonably defines whether the mixture is richer.
The control device of the electronic injection system of the extended-range engine comprises a controller, wherein the controller is programmed so as to execute the control method of the electronic injection system of the extended-range engine.
The vehicle comprises the control device of the electronic injection system of the extended-range engine.
On the basis of conventional closed-loop control, the method activates the oxygen removal capability of the catalyst, ensures that the oxygen storage capability of the catalyst always has certain activity, improves the conversion efficiency of the catalyst and ensures the emission consistency by periodically enriching and reducing the air-fuel ratio (of the engine) under steady-state operation (namely, increasing the process of periodic air-fuel ratio oscillation in long-time steady-state working condition of the extended-range engine).
Drawings
Fig. 1 is a control flow chart of an electronic injection system of an extended-range engine in the present embodiment.
Fig. 2 is a schematic diagram of control of the air-fuel ratio in the present embodiment.
Detailed Description
The post oxygen sensor detects the oxygen content in the gas directly discharged by the extended-range engine, and sends data information (namely, a voltage signal) representing the oxygen content to the controller, the controller judges the air-fuel ratio of the mixture actually entering the cylinder (namely, the actual air-fuel ratio) according to the change of the oxygen content in the exhaust gas, compares the air-fuel ratio with a target air-fuel ratio, corrects the fuel injection amount according to the comparison result, and finally keeps the actual air-fuel ratio near the target air-fuel ratio, thereby realizing the air-fuel ratio closed loop control.
As shown in fig. 1, the control method of the electronic injection system of the extended-range engine in the embodiment is applied to the air-fuel ratio closed-loop control process, and specifically includes the following steps:
S1, judging whether the time of the extended-range engine under the steady-state working condition exceeds the preset steady-state time t ss, if so, executing S2, otherwise, executing S5.
If the variation delta n of the rotational speed of the extended-range engine is smaller than the preset rotational speed threshold n thr and the variation delta Pe of the load of the extended-range engine is smaller than the preset load threshold Pe thr, the extended-range engine is in a steady-state working condition. In this embodiment, the preset steady state time t ss =100 ms, the preset rotational speed threshold n thr =80 rpm, and the preset load threshold Pe thr =3%. That is, if the extended-range engine speed variation Deltan is less than 80rpm and the duration of the extended-range engine load variation DeltaPe is less than 3% is greater than or equal to 100ms, S2 is executed, otherwise S5 is executed.
S2, judging whether the mixture is rich, if so, executing S3, otherwise (namely, when the mixture is not rich), executing S4.
If the voltage of the reaction oxygen content output by the rear oxygen sensor is smaller than or equal to a preset voltage threshold value, the mixed gas is not richer, otherwise, the mixed gas is richer. The preset voltage threshold in this embodiment is equal to 450mV.
S3, executing an oscillation control strategy II, and then executing S5.
The second oscillation control strategy is as follows: the target air-fuel ratio r=r mid-Rbias (corresponding to the air-fuel ratio being lean) is first set and the operation time t ac is maintained, and then the target air-fuel ratio r=r mid+Rbias (corresponding to the air-fuel ratio being rich) is set and the operation time t ac is maintained, which is denoted as a cycle, and the cycle is repeated n times.
S4, executing an oscillation control strategy I, and then executing S5.
The first oscillation control strategy is as follows: the target air-fuel ratio r=r mid+Rbias (corresponding to the air-fuel ratio enrichment) is first set and the operation time t ac is maintained, and then the target air-fuel ratio r=r mid-Rbias (corresponding to the air-fuel ratio depletion) is set and the operation time t ac is maintained, which is denoted as a cycle, and the cycle is repeated n times.
S5, executing the conventional control strategy, and then returning to S1.
The conventional control strategy is: the target air-fuel ratio r=r mid is made.
Where R mid denotes an air-fuel ratio median value, R bias denotes an air-fuel ratio median shift amount, and n denotes the number of cycles of air-fuel ratio shift control.
And according to the rotation speed and the load of the extended-range engine, inquiring a preset air-fuel ratio median value table to obtain an air-fuel ratio median value R mid. The preset air-fuel ratio median value table is a corresponding relation table of the extended-range engine speed, the extended-range engine load and the air-fuel ratio median value obtained through calibration.
And according to the rotation speed and the load of the extended-range engine, inquiring a preset air-fuel ratio median offset table to obtain an air-fuel ratio median offset R bias. The preset air-fuel ratio median deviation table is a corresponding relation table of the extended-range engine speed, the extended-range engine load and the air-fuel ratio median deviation amount obtained through calibration.
And inquiring a preset action time table according to the rotation speed and the load of the extended-range engine to obtain action time t ac. The preset action time table is a corresponding relation table of the extended-range engine speed, the extended-range engine load and the action time obtained through calibration.
And inquiring a preset cycle number table according to the rotation speed and the load of the extended-range engine to obtain the cycle number n of the air-fuel ratio offset control. The preset cycle number table is a corresponding relation table of the rotation speed of the extended-range engine, the load of the extended-range engine and the cycle number of the air-fuel ratio offset control, which are obtained through calibration.
Fig. 2 shows a process of continuously operating for 3 cycles after the target air-fuel ratio is first lean (lower than the median) for 5ms and then rich (higher than the median) for 5ms, and then lean and rich when the air-fuel mixture is rich after the steady state operation of the extended range engine is performed for 100 ms. Wherein ① denotes an extended-range engine speed, ② denotes an extended-range engine load, ③ denotes a target air-fuel ratio, and ④ denotes an actual air-fuel ratio.
The present embodiment also provides a control device of an electronic injection system of an extended-range engine, the control device including a controller programmed to execute the control method of the electronic injection system of the extended-range engine.
The embodiment also provides a vehicle, which comprises the control device of the electronic injection system of the range-extending engine.
Claims (10)
1. A control method of an electronic injection system of an extended-range engine, comprising:
In the air-fuel ratio closed-loop control process, when the time of the extended-range engine in a steady-state working condition exceeds a preset steady-state time t ss, if the gas mixture is not rich, executing an oscillation control strategy I, then resuming to execute a conventional control strategy, and if the gas mixture is rich, executing an oscillation control strategy II, then resuming to execute the conventional control strategy; wherein,
The first oscillation control strategy is as follows: the target air-fuel ratio r=r mid+Rbias is maintained for the operation time t ac, and then the target air-fuel ratio r=r mid-Rbias is maintained for the operation time t ac, which is recorded as a cycle, and the cycle is repeated n times;
The second oscillation control strategy is as follows: the target air-fuel ratio r=r mid-Rbias is maintained for the operation time t ac, and then the target air-fuel ratio r=r mid+Rbias is maintained for the operation time t ac, which is recorded as a cycle, and the cycle is repeated n times;
The conventional control strategy is: making the target air-fuel ratio r=r mid;
R mid denotes an air-fuel ratio median value, R bias denotes an air-fuel ratio median shift amount, and n denotes the number of cycles of air-fuel ratio shift control.
2. The control method of an electronic injection system of an extended-range engine according to claim 1, characterized by:
inquiring a preset air-fuel ratio median offset table according to the rotation speed and the load of the extended-range engine to obtain the air-fuel ratio median offset R bias; the preset air-fuel ratio median deviation table is a corresponding relation table of the extended-range engine speed, the extended-range engine load and the air-fuel ratio median deviation amount obtained through calibration;
Inquiring a preset action time table according to the rotation speed and the load of the extended-range engine to obtain the action time t ac; the preset action time table is a corresponding relation table of the rotation speed of the extended-range engine, the load of the extended-range engine and the action time, which are obtained through calibration;
inquiring a preset cycle number table according to the rotation speed and the load of the extended range engine to obtain the cycle number n of the air-fuel ratio offset control; the preset cycle number table is a corresponding relation table of the rotation speed of the extended-range engine, the load of the extended-range engine and the cycle number of the air-fuel ratio offset control, which are obtained through calibration.
3. The control method of an electronic injection system of an extended-range engine according to claim 2, characterized by:
Inquiring a preset air-fuel ratio median value table according to the rotation speed and the load of the extended-range engine to obtain the air-fuel ratio median value R mid; the preset air-fuel ratio median value table is a corresponding relation table of the extended-range engine speed, the extended-range engine load and the air-fuel ratio median value obtained through calibration.
4. A control method of an electronic injection system of an extended-range engine according to any one of claims 1 to 3, characterized by: the value range of the preset steady-state time t ss is 100 ms-1000 ms.
5. A control method of an electronic injection system of an extended-range engine according to any one of claims 1 to 3, characterized by: if the variation delta n of the rotational speed of the extended-range engine is smaller than the preset rotational speed threshold n thr and the variation delta Pe of the load of the extended-range engine is smaller than the preset load threshold Pe thr, the extended-range engine is in a steady-state working condition.
6. A control method of an electronic injection system of an extended-range engine according to any one of claims 1 to 3, characterized by: if the voltage of the reaction oxygen content output by the rear oxygen sensor is smaller than or equal to a preset voltage threshold value, the mixed gas is not richer, otherwise, the mixed gas is richer.
7. The control method of an electronic injection system of an extended-range engine according to claim 5, characterized by: the value range of the preset rotating speed threshold n thr is 70-150 rpm, and the value range of the preset load threshold Pe thr is 2-8%.
8. The control method of an electronic injection system of an extended-range engine according to claim 6, characterized by: the value range of the preset voltage threshold is 420 mV-500 mV.
9. The utility model provides a control device of electronic fuel injection system of extended-range engine, includes controller, its characterized in that: the controller being programmed to perform the control method of any one of claims 1 to 8.
10. A vehicle, characterized in that: comprising a control device according to claim 9.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105899789A (en) * | 2014-01-10 | 2016-08-24 | 丰田自动车株式会社 | Control system of internal combustion engine |
| CN113864073A (en) * | 2021-09-28 | 2021-12-31 | 重庆长安新能源汽车科技有限公司 | Control method and system for oxygen sensor diagnosis of extended-range hybrid electric vehicle |
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| JP7107164B2 (en) * | 2018-10-26 | 2022-07-27 | トヨタ自動車株式会社 | Control device for internal combustion engine |
| US10947910B2 (en) * | 2019-05-07 | 2021-03-16 | Ford Global Technologies, Llc | Method and system for catalyst feedback control |
| CN115387926B (en) * | 2022-08-05 | 2023-09-15 | 上汽通用五菱汽车股份有限公司 | Engine emission closed-loop control method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105899789A (en) * | 2014-01-10 | 2016-08-24 | 丰田自动车株式会社 | Control system of internal combustion engine |
| CN113864073A (en) * | 2021-09-28 | 2021-12-31 | 重庆长安新能源汽车科技有限公司 | Control method and system for oxygen sensor diagnosis of extended-range hybrid electric vehicle |
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