CN111946521A - Control method for improving cold starting performance of internal combustion engine - Google Patents
Control method for improving cold starting performance of internal combustion engine Download PDFInfo
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- CN111946521A CN111946521A CN201910412351.6A CN201910412351A CN111946521A CN 111946521 A CN111946521 A CN 111946521A CN 201910412351 A CN201910412351 A CN 201910412351A CN 111946521 A CN111946521 A CN 111946521A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 16
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 7
- 239000002826 coolant Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
- F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
- F02N11/0829—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode related to special engine control, e.g. giving priority to engine warming-up or learning
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides a control method for improving the cold starting performance of an internal combustion engine, which comprises the following steps of: s1: entering a step a of calculating the minimum engine temperature after the engine controller is electrified; s2: compares the temperature measured through the step S1 with a threshold value, "b is the minimum engine temperature less than the threshold value "; s2.1: the minimum engine temperature is less than a set threshold: s2.1.1 enter "c enter Cold Start Compensation mode"; s2.2: the minimum engine temperature is not less than a set threshold: s2.2.1 entering "d enter Normal Start mode"; s2.2.2, the method ends after entering 'g enters idle speed control'. The method has the advantages of simple process principle and convenient and fast implementation, prevents the rotation speed of the engine from greatly fluctuating or stalling because the engine is too early after starting and retreating from the starting stage, ensures that the starting stage is maintained after the engine is successfully started, retreats from the compensation mode when the temperature in the engine cylinder is improved, and then enters the idle speed control stage, so that the phenomena of stalling and large fluctuation of the rotation speed of the engine cannot occur.
Description
Technical Field
The invention mainly relates to the field of engines, in particular to a control method for improving cold starting performance of an internal combustion engine.
Background
The calculation of the starting fuel injection quantity of the engine is generally obtained by looking up a table according to the rotating speed and the temperature of the engine, the fuel injection quantity is increased along with the increase of the rotating speed and the reduction of the temperature, the fuel injection quantity is calibrated to be larger in order to enable the engine to be started smoothly, the engine exits from a starting state and enters into an idle speed control state after the rotating speed is increased to a certain value through combustion in an engine cylinder, the idle speed control is closed-loop control, and the actual rotating speed of the engine is controlled to be close to the set rotating speed of the engine through PID. The normal-temperature-start engine speed curve is shown in fig. 4 below.
Because the friction resistance of the engine is relatively large in a cold environment, the combustion in the cylinder is insufficient (less than the work done at normal temperature), the engine can be started smoothly due to relatively large fuel injection quantity in the starting stage, but the rapid reduction of the fuel injection quantity in the idling stage can cause the rapid reduction of the work done and can not overcome the friction resistance, and the engine can generate large-amplitude fluctuation of the rotating speed and even flameout, as shown in the following figures 5-6.
The published Chinese invention patent, application number CN200910179724.6, patent name: liquid cooled internal combustion engine having an oil cooler and method of operating the same, filing date: 20090930, liquid-cooled internal combustion engine with a coolant circuit comprising a coolant jacket integrated in the cylinder head, a supply pipe supplying coolant to the coolant jacket and a discharge pipe discharging coolant, the discharge pipe passing through the coolant-operated oil cooler and communicating to the supply pipe from upstream of a pump for supplying coolant provided in the supply pipe to form a circuit; a bypass pipe branches from the supply pipe downstream of the pump and communicates with a discharge pipe between the oil cooler and the pump, and a three-position/two-way valve is provided between the bypass pipe and the discharge pipe, which connects the pump to the oil cooler through the bypass pipe and the discharge pipe in a first switching state, separates the discharge pipe from the supply pipe, and separates the discharge pipe from the bypass pipe to connect the oil cooler to the supply pipe upstream of the pump through the discharge pipe in a second switching state. Hereby it is achieved that the warm-up phase of the internal combustion engine after a cold start allows an optimized operation of fuel consumption and friction.
Disclosure of Invention
The invention provides a control method for improving the cold starting performance of an internal combustion engine, aiming at the defects in the prior art, and the control method for improving the cold starting performance of the internal combustion engine comprises the following steps:
s1: entering a step a of calculating the minimum engine temperature after the engine controller is electrified;
s2: compares the temperature measured through the step S1 with a threshold value, "b is the minimum engine temperature less than the threshold value? ", judging whether entering a cold start compensation mode;
s2.1: the minimum engine temperature is less than a set threshold:
s2.1.1 enter "c enter Cold Start Compensation mode";
s2.1.2, obtaining a starting delay time tp value according to the minimum engine temperature table after entering the compensation mode, meeting the cold starting compensation exit condition when the timer is more than tp or the opening of the accelerator pedal is more than a certain value and exceeds a certain time or the engine speed exceeds a larger value and exceeds a certain time, and ending after the exit condition is met until g enters the idle speed control (the engine normally runs) mode;
s2.2: the minimum engine temperature is not less than a set threshold:
s2.2.1 entering "d enter Normal Start mode";
s2.2.2, if the engine speed exceeds the starting success threshold value, the starting is judged to be successful, and then the process is ended after the step g enters the idle speed control (the normal running mode of the engine).
Preferably, in step S1, the minimum engine temperature is the minimum value of the temperature values collected by the temperature sensors on the engine.
Preferably, in step S1, the temperature measured by the temperature sensor includes an engine cooling water temperature, an intake air temperature, and an oil temperature.
The invention has the beneficial effects that: the method has the advantages of simple process principle and convenient implementation, prevents the rotation speed of the engine from greatly fluctuating or stalling due to the fact that the engine is early started and retreated from the starting stage, ensures that the starting stage is maintained after the engine is successfully started, retreats from a compensation mode after the combustion effect is improved after the temperature in the engine cylinder is improved, and then enters the idle speed control stage, and the phenomena of stalling and large fluctuation of the rotation speed of the engine cannot occur at the moment.
Drawings
FIG. 1 is a main control flow diagram of the present invention;
FIG. 2 is a logic diagram of the cold start compensation exit condition calculation of the present invention;
FIG. 3 is a schematic diagram of engine speed after the cold start compensation mode is engaged in accordance with the present invention;
FIG. 4 is a schematic diagram of a normal temperature starting speed curve in the background art of the present invention;
FIG. 5 is a schematic diagram illustrating the large fluctuation of the rotation speed after the successful start in the background art of the present invention;
FIG. 6 is a diagram illustrating a prior art ignition-off process after successful start-up;
Detailed Description
As shown in fig. 1-3, the present invention comprises the following steps:
s1: entering a step a of calculating the minimum engine temperature after the engine controller is electrified;
s2: compares the temperature measured through the step S1 with a threshold value, "b is the minimum engine temperature less than the threshold value? ", judging whether entering a cold start compensation mode;
s2.1: the minimum engine temperature is less than a set threshold:
s2.1.1 enter "c enter Cold Start Compensation mode";
s2.1.2, obtaining a starting delay time tp value according to the minimum engine temperature table after entering the compensation mode, meeting the cold starting compensation exit condition when the timer is more than tp or the opening of the accelerator pedal is more than a certain value and exceeds a certain time or the engine speed exceeds a larger value and exceeds a certain time, and ending after the exit condition is met until g enters the idle speed control (the engine normally runs) mode;
s2.2: the minimum engine temperature is not less than a set threshold:
s2.2.1 entering "d enter Normal Start mode";
s2.2.2, if the engine speed exceeds the starting success threshold value, the starting is judged to be successful, and then the process is ended after the step g enters the idle speed control (the normal running mode of the engine).
In use, the start delay time and cold start compensation mode exit condition calculations at S2.1.2 are shown in FIG. 2.
In order to prevent the engine from greatly fluctuating in rotation speed or stalling due to the fact that the engine is started and retreated out of the starting stage too early, a cold start compensation mode is added, the fact that the starting stage (maintaining the calculation of parameters such as fuel injection quantity and advance angle during starting) is maintained for a period of time (tp) after the engine is started successfully (namely the rotation speed of the engine exceeds a threshold value for switching the original starting to the idling) is guaranteed, when the temperature in the engine cylinder is increased, the compensation mode is retreated after the combustion effect is improved, and then the idling control stage is started, and at the moment, the phenomena of stalling and large fluctuation in rotation speed of the engine cannot occur.
In this embodiment, it is preferable that the minimum engine temperature in step S1 be the minimum value of the temperature values collected by the temperature sensors on the engine.
By the aid of the structure, the lowest temperature of various parts is collected in real time, and detection efficiency is improved conveniently.
In this embodiment, it is preferable that the temperature measured by the temperature sensor includes an engine cooling water temperature, an intake air temperature, and an engine oil temperature in step S1.
By the aid of the structure, the lowest temperature of various parts is collected in real time, and detection efficiency is improved conveniently.
The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of this patent application.
Claims (3)
1. A control method for improving cold start performance of an internal combustion engine, characterized by comprising the steps of:
s1: entering a step a of calculating the minimum engine temperature after the engine controller is electrified;
s2: compares the temperature measured through the step S1 with a threshold value, "b is the minimum engine temperature less than the threshold value? ", judging whether entering a cold start compensation mode;
s2.1: the minimum engine temperature is less than a set threshold:
s2.1.1 enter "c enter Cold Start Compensation mode";
s2.1.2, obtaining a starting delay time tp value according to the minimum engine temperature table after entering the compensation mode, meeting the cold starting compensation exit condition when the timer is more than tp or the opening of the accelerator pedal is more than a certain value and exceeds a certain time or the engine speed exceeds a larger value and exceeds a certain time, and ending after the exit condition is met until g enters the idle speed control (the engine normally runs) mode;
s2.2: the minimum engine temperature is not less than a set threshold:
s2.2.1 entering "d enter Normal Start mode";
s2.2.2, if the engine speed exceeds the starting success threshold value, the starting is judged to be successful, and then the process is ended after the step g enters the idle speed control (the normal running mode of the engine).
2. The control method for improving the cold startability of the internal combustion engine according to claim 1, characterized in that: in step S1, the minimum engine temperature is the minimum value of the temperature values collected by the temperature sensors on the engine.
3. The control method for improving the cold startability of the internal combustion engine according to claim 2, characterized in that: in step S1, the temperature measured by the temperature sensor includes the temperature of the engine cooling water, the temperature of the intake air, and the temperature of the engine oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910412351.6A CN111946521A (en) | 2019-05-17 | 2019-05-17 | Control method for improving cold starting performance of internal combustion engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910412351.6A CN111946521A (en) | 2019-05-17 | 2019-05-17 | Control method for improving cold starting performance of internal combustion engine |
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| CN111946521A true CN111946521A (en) | 2020-11-17 |
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| CN201910412351.6A Pending CN111946521A (en) | 2019-05-17 | 2019-05-17 | Control method for improving cold starting performance of internal combustion engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114909228A (en) * | 2022-05-27 | 2022-08-16 | 中国第一汽车股份有限公司 | Engine starting control method and device, hybrid vehicle and storage medium |
| CN115435029A (en) * | 2022-09-21 | 2022-12-06 | 中国第一汽车股份有限公司 | Clutch control method and vehicle |
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| CN101871399A (en) * | 2009-04-27 | 2010-10-27 | 本田技研工业株式会社 | The control gear of general-purpose engine |
| CN103883411A (en) * | 2014-03-14 | 2014-06-25 | 潍柴动力股份有限公司 | External characteristic control method and device of electrically-controlled engine |
| CN108468610A (en) * | 2018-03-23 | 2018-08-31 | 潍柴动力股份有限公司 | A kind of cold start-up householder method and a kind of cold-booting auxiliary device |
| US20180252176A1 (en) * | 2015-09-24 | 2018-09-06 | Cummins Power Generation Limited | Systems and method for enabling quick cold starting |
| CN108661839A (en) * | 2017-03-30 | 2018-10-16 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of diesel engine grid method for heating and controlling based on state machine |
-
2019
- 2019-05-17 CN CN201910412351.6A patent/CN111946521A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871399A (en) * | 2009-04-27 | 2010-10-27 | 本田技研工业株式会社 | The control gear of general-purpose engine |
| CN103883411A (en) * | 2014-03-14 | 2014-06-25 | 潍柴动力股份有限公司 | External characteristic control method and device of electrically-controlled engine |
| US20180252176A1 (en) * | 2015-09-24 | 2018-09-06 | Cummins Power Generation Limited | Systems and method for enabling quick cold starting |
| CN108661839A (en) * | 2017-03-30 | 2018-10-16 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of diesel engine grid method for heating and controlling based on state machine |
| CN108468610A (en) * | 2018-03-23 | 2018-08-31 | 潍柴动力股份有限公司 | A kind of cold start-up householder method and a kind of cold-booting auxiliary device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114909228A (en) * | 2022-05-27 | 2022-08-16 | 中国第一汽车股份有限公司 | Engine starting control method and device, hybrid vehicle and storage medium |
| CN115435029A (en) * | 2022-09-21 | 2022-12-06 | 中国第一汽车股份有限公司 | Clutch control method and vehicle |
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Application publication date: 20201117 |