CN112576393B - Diesel engine starting oil quantity slope control method based on instantaneous rotating speed and storage medium - Google Patents
Diesel engine starting oil quantity slope control method based on instantaneous rotating speed and storage medium Download PDFInfo
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- CN112576393B CN112576393B CN202011439024.9A CN202011439024A CN112576393B CN 112576393 B CN112576393 B CN 112576393B CN 202011439024 A CN202011439024 A CN 202011439024A CN 112576393 B CN112576393 B CN 112576393B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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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
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
- F02D2200/0416—Estimation of air temperature
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- Combustion & Propulsion (AREA)
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Abstract
The invention aims to provide a slope control method for the starting oil quantity of a diesel engine based on instantaneous rotating speed and a storage medium. When the real-time rotating speed of the diesel engine is greater than the slope initial rotating speed threshold value, the state is switched to a starting state; the starting oil amount is increased from the initial oil amount to the target oil amount in a slope algorithm of Q1; when the instantaneous rotating speed of the engine is greater than the transition rotating speed, assigning the current fuel injection quantity to the transition fuel quantity and freezing the transition fuel quantity to be used as the slope initial fuel quantity of the transition stage; after the state is switched to the transition state, the starting oil amount is decreased from the transition oil amount at the time of state switching to the idling stable oil amount slope according to the slope algorithm of Q2. Has the advantages that: 1. in the initial starting stage, fire caused by over-rich mixed gas can be avoided, and smooth starting of the diesel engine is ensured. 2. And in the transition stage, the smooth transition from the starting to the idling is realized, and the over-lean mixed gas in the transition stage is prevented from generating misfire, so that the HC emission in the starting transition stage is reduced.
Description
Technical Field
The invention relates to a method for controlling fuel injection quantity in the starting process of a diesel engine, in particular to a method for controlling the starting fuel quantity slope of the diesel engine based on instantaneous rotating speed and a storage medium.
Background
Diesel engines are widely used in various industries due to their advantages of high thermal efficiency, durability, reliability, etc., and their operating environments are different. The diesel engine starting strategy should meet the starting performance of the diesel engine under different environments, such as cold start, high altitude start and the like. Therefore, the environmental conditions such as the coolant temperature, the intake air temperature and the atmospheric pressure are taken into account in the calculation of the amount of the starting oil of the diesel engine, so that the diesel engine can be started smoothly under different environmental conditions.
The starting process is an unstable, transient condition that must be passed before any diesel engine can operate normally. During the starting process of the diesel engine, incomplete combustion and more fire cycles result in a large amount of unburned hydrocarbon and partial oxidation reaction products in exhaust gas, so that harmful emissions during the starting process of the diesel engine are far higher than normal working conditions. The quantity of injected fuel is an important factor in the starting process of diesel engines. The rotating speed of the diesel engine in the initial starting stage and the wall surface temperature of the combustion chamber are lower, the temperature and the pressure in the cylinder are lower when the compression is finished, the quality of formed mixed gas is poorer, and the diesel engine is always started smoothly by adopting larger fuel injection quantity. However, the air intake amount is small in the starting process of the diesel engine, and the HC emission in the starting process of the diesel engine can be greatly increased due to over-rich air mixture. In addition, the starting oil quantity is too large, the rotating speed is greatly increased when the starting of the diesel engine is finished, and the adjusting process of the idle speed PID is influenced. The idling PID calculates the oil quantity too small due to the fact that the rotating speed is up, so that the mixer is too thin in the transition stage, fire catching occurs, and HC emission performance of the diesel engine is deteriorated.
Disclosure of Invention
The invention aims to provide a slope control method of diesel engine starting oil quantity based on instantaneous rotating speed and a storage medium, and aims to calculate the fuel injection quantity in real time according to the instantaneous rotating speed of a diesel engine, so that the fuel injection quantity changes in a slope mode in the starting process, thereby being more suitable for the boundary condition of the diesel engine starting process and improving combustion and emission.
The technical scheme for realizing the invention is as follows:
a slope control method for starting fuel injection quantity of a diesel engine based on instantaneous rotating speed is realized by adopting a slope state machine in an ECU, and comprises the following steps:
s1, entering an initialization state after the ECU is electrified, wherein the starting oil quantity is an initial oil quantity;
s2, when the real-time rotating speed of the diesel engine is larger than a slope initial rotating speed threshold value, the state is switched to a starting state; the starting fuel quantity is increased from the initial fuel quantity to the target fuel quantity in a slope algorithm of Q1;
s3, assigning the current fuel injection quantity to a transition fuel quantity and freezing the transition fuel quantity when the instantaneous rotating speed of the engine is greater than the transition rotating speed, and taking the assigned value as the slope starting fuel quantity of the transition stage; after the state is switched to the transition state, the starting oil quantity is reduced to an idling stable oil quantity slope from the transition oil quantity during state switching according to a slope algorithm of Q2;
s4, when the engine is switched into the running state, the starting process is finished, the engine is switched into the holding state, the engine is waited to be flameout in the state, and the engine is switched back to the initial state after the rotating speed is equal to 0; when the engine is switched to stall, the engine is switched back to the initial state after the rotating speed is equal to 0.
Further, the ramp state machine adopts a ramp algorithm, and the calculation method is as follows:
wherein Start _ q _ Str represents the starting oil amount; q _ Ini represents the initial oil volume; n _ Real represents the instantaneous rotating speed of the engine, and Q _ Term represents the target oil quantity; n _ IdleSet represents an idle speed set value; start _ n _ StrtRampThres _ C represents a ramp Start rotational speed threshold, and Q _ Trans represents a transient oil amount.
Further, the initial oil quantity is obtained by adding the altitude correction oil quantity to the initial oil quantity base value;
the initial oil mass base value is obtained by calculating the initial oil mass MAP according to the air inlet temperature and the cooling liquid temperature;
the altitude correction oil quantity is obtained by multiplying the initial oil quantity altitude correction oil quantity base value by an initial oil quantity altitude correction coefficient;
the initial oil quantity altitude correction oil quantity base value is calculated by an initial oil quantity altitude correction base MAP according to the air inlet temperature and the cooling liquid temperature;
and the initial oil quantity altitude correction coefficient is calculated according to the atmospheric pressure through a correction coefficient curve.
Further, the idle stabilization oil amount is calculated from the idle stabilization oil amount MAP based on the coolant temperature and the idle setting value.
Further, the transitional rotation speed is calculated by the transitional rotation speed MAP according to the calculated target oil amount and the idle speed set value.
The invention also provides a computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of a method for starting a ramp control of the fuel injection quantity of a diesel engine on the basis of the instantaneous rotational speed.
The present invention also provides a vehicle engine ECU comprising a computer readable storage medium storing a computer program for implementing the steps of the transient speed based diesel engine start fuel ramp control method of the present invention.
Principle of operation
The starting oil quantity slope control strategy based on the instantaneous rotating speed is composed of an initial oil quantity calculation model, a target oil quantity calculation model, an idle stable oil quantity calculation model, a transition rotating speed calculation model and an oil quantity slope calculation model. And the initial oil quantity calculation model calculates an initial oil quantity basic value through an initial oil quantity MAP according to the air inlet temperature and the cooling liquid temperature, and corrects the atmospheric pressure to adapt to the change of the altitude. And the target oil mass calculation model calculates a target oil mass base value through a target oil mass MAP according to the air inlet temperature and the cooling liquid temperature, and corrects the atmospheric pressure to adapt to the change of the altitude. And the idle stable oil quantity calculation model calculates the stable oil quantity of the diesel engine at the current cooling liquid temperature and the idle rotating speed according to the idle set value and the cooling liquid temperature. The transitional rotating speed module calculates the transitional rotating speed according to the calculated target oil quantity and the idle speed set value. The fuel quantity slope module uses the initial fuel quantity, the target fuel quantity, the transition rotating speed and the idling stable fuel quantity to enable the starting fuel injection quantity of the diesel engine to change along with the transient rotating speed slope.
Advantageous effects
1. In the initial starting period, a smaller fuel injection quantity can be used for matching with a smaller air inflow, so that fire caused by over-rich mixed gas is avoided. The fuel injection quantity is increased in a slope mode to ensure smooth starting of the diesel engine.
2. In the transition stage, the slope strategy can quickly reduce the fuel injection quantity, the stable transition from starting to idling is realized, and the phenomenon that the fuel injection quantity of the idling PID adjustment is too small due to the fact that the rotating speed is uprushed when the starting is finished is avoided, so that the mixed gas in the transition stage is prevented from being too lean to cause fire catching, and the HC emission in the starting transition stage is reduced.
Drawings
Fig. 1 is a schematic diagram of a starting oil amount ramp control method according to the present invention.
Fig. 2 is a control flow chart of the ramp algorithm.
FIG. 3 is a graph of instantaneous speed during a start with a ramp strategy and constant cycle fuel injection of 27 mg.
Fig. 4 shows the ramp strategy versus cycle fuel injection for a start-up procedure with a constant cycle fuel injection of 27 mg.
FIG. 5 is a graph of HC emission concentration during a ramp strategy and start with constant cycle fuel injection of 27 mg.
FIG. 6 is a graph comparing the ramp strategy with a constant cycle fuel injection 27mg start-up process.
Reference numerals are as follows:
a is the fuel injection quantity of a slope strategy; b is a constant cycle oil injection of 27 mg.
Detailed Description
The invention provides a method for controlling the starting oil quantity slope of a diesel engine based on instantaneous rotating speed and a storage medium, and in order to make the purpose, the technical scheme and the effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and taking examples. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.
The engine state: 0-stationary state, 1-preparation state, 2-start state, 3-running state, 4-stop state, 5-end state; the running state sequence of the engine is 0-1-2-3-4-5-0.
As shown in fig. 1, the starting fuel quantity ramp control strategy based on the instantaneous rotation speed is composed of an initial fuel quantity calculation model, a target fuel quantity calculation model, an idle stable fuel quantity calculation model, a transition rotation speed calculation model and a ramp algorithm model. The main inputs include EngCo _ st _ Eng (engine state), n _ Real (instantaneous speed), T _ Clnt (coolant temperature, n _ IdleSet (idle set value), T _ Intk (intake air temperature), and P _ EnvP (atmospheric pressure), and the output is Satrt _ q _ Srt (start fuel injection amount).
The initial oil quantity is obtained by adding the altitude correction oil quantity to the initial oil quantity base value. The initial oil amount base value is calculated from the initial oil amount MAP based on the intake air temperature and the coolant temperature. The altitude correction oil quantity is obtained by multiplying the initial oil quantity altitude correction oil quantity base value by an initial oil quantity altitude correction coefficient. The initial oil quantity altitude correction oil quantity base value is calculated from the initial oil quantity altitude correction base MAP based on the intake air temperature and the coolant temperature. And the initial oil quantity altitude correction coefficient is calculated according to the atmospheric pressure through a correction coefficient curve.
The target oil quantity is obtained by adding the altitude correction oil quantity to the target oil quantity base value. The target oil amount base value is calculated from the intake air temperature and the coolant temperature by the target oil amount MAP. The altitude correction oil quantity is obtained by multiplying the target oil quantity altitude correction oil quantity base value by a target oil quantity altitude correction coefficient. The target oil quantity altitude correction oil quantity base value is calculated from the target oil quantity altitude correction base MAP according to the intake air temperature and the coolant temperature. And the target oil mass altitude correction coefficient is calculated according to the atmospheric pressure through a correction coefficient curve.
The idle stable oil amount is calculated by the idle stable oil amount MAP according to the coolant temperature and the idle set value.
And the transitional rotating speed is calculated by the transitional rotating speed MAP according to the calculated target oil quantity and the idle speed set value.
As shown in fig. 2, the ramp algorithm is implemented by a ramp state machine. The method comprises the following specific steps:
when the ECU is initialized, the ECU enters an initial state, and the starting oil quantity is the initial oil quantity. When the instantaneous speed of the diesel engine is greater than the ramp Start speed threshold Start _ n _ strtratpthres _ C, the state is switched to the cranking state, and the cranking oil amount is ramped from the initial oil amount to the target oil amount according to a ramp algorithm of equation (Q1). When the instantaneous rotating speed of the engine is greater than the transition rotating speed, the state is switched from the starting state to the transition state, the current fuel injection quantity is assigned to the transition fuel quantity Q _ Trans and is frozen to be used as the slope starting fuel quantity of the transition stage. After entering the state transition state, the starting oil amount is decreased from the transition oil amount at the state switching to the idle steady oil amount slope by an equation (Q2). When the engine state is in the running state, the starting process is finished, the state is switched to the holding state, the engine is waited to be flameout in the holding state, and the initial state is switched back after the rotating speed is equal to 0.
The ramp algorithm is used as follows:
wherein Start _ q _ Str represents the starting oil amount;
q _ Ini represents the initial oil volume;
n _ Real represents the instantaneous engine speed,
q _ Term represents the target oil quantity;
n _ IdleSet represents an idle speed setting value;
start _ n _ StrtRampThres _ C represents a ramp Start rotational speed threshold, and Q _ Trans represents a transient oil amount.
In order to verify the starting oil quantity slope control strategy based on the instantaneous rotating speed, a verification test is carried out on a certain type of four-cylinder diesel engine. The ramp strategy starting process is compared with the starting process with the constant cycle fuel injection quantity of 27 mg. Fig. 3 is a comparison of instantaneous speeds during starting, and the ramp strategy is ended when the speed is not overshot and the constant cycle fuel injection amount 27mg is greatly overshot. FIG. 4 is a comparison of cyclic fuel injection during startup, where ramp strategy startup gradually increases fuel injection, rapidly decreases fuel injection during transition, and when idling is entered, the fuel injection fluctuation of idle PID regulation is small; after the start of the constant cycle fuel injection quantity of 27mg is finished, the fuel injection quantity fluctuation of the idle speed PID regulation is large. Fig. 5 shows the HC emission concentration during the starting process. The HC emission concentration during the ramp strategy start-up did not spike with the HC concentration during the start-up with constant cycle fuel injection of 27 mg. Fig. 6 shows the statistical results of the starting process, which are the average of 10 tests. The ramp strategy compares to a constant cycle fuel injection 27mg start-up. The starting time is reduced by 0.39 second and shortened by 22 percent; the starting oil quantity is reduced by 134mg and 26%; the HC emissions during start-up were reduced by 14mg, 29%.
Working process
First, the ECU enters an initial state at the time of initialization, and the starting oil amount is the initial oil amount. When the instantaneous speed of the diesel engine is greater than the ramp starting speed threshold value Start _ n _ StrtRampThres _ C, the state is switched to the startup state, and the startup oil amount is ramped up from the initial oil amount to the target oil amount according to a ramp algorithm of the equation (Q1). When the instantaneous rotating speed of the engine is greater than the transition rotating speed, the state is switched from the starting state to the transition state, the current fuel injection quantity is assigned to the transition fuel quantity Q _ Trans and is frozen to be used as the slope starting fuel quantity of the transition stage. After entering the state transition state, the starting oil quantity is reduced from the transition oil quantity at the state switching to the idling stable oil quantity slope according to an equation Q2. When the engine state is in the running state, the starting process is finished, the engine is switched to the holding state, the engine is waited to be flameout in the state, and the engine is switched back to the initial state after the rotating speed is equal to 0; if the starting is unsuccessful and the flameout is carried out midway, the rotation speed is switched back to the initial state after being equal to 0.
Claims (6)
1. A diesel engine starting fuel injection quantity slope control method based on instantaneous rotating speed is characterized in that: the method is realized by adopting a slope state machine in an ECU, and comprises the following steps:
s1, entering an initialization state after the ECU is electrified, wherein the starting oil quantity is an initial oil quantity;
s2, when the real-time rotating speed of the diesel engine is larger than the slope initial rotating speed threshold value, the state is switched to a starting state; the starting fuel quantity is increased from the initial fuel quantity to the target fuel quantity in a slope algorithm of Q1;
s3, assigning the current fuel injection quantity to a transition fuel quantity and freezing the transition fuel quantity when the instantaneous rotating speed of the engine is greater than the transition rotating speed, and taking the assigned value as the slope starting fuel quantity of the transition stage; after the state is switched to the transition state, the starting oil quantity is reduced from the transition oil quantity in the state switching to an idling stable oil quantity slope according to a slope algorithm of Q2;
s4, when the engine is switched to the running state, the starting process is finished, the engine is switched to the holding state at the moment, the engine is waited to be flameout in the holding state, and the engine is switched back to the initial state after the rotating speed is equal to 0; when the engine is switched to flameout, the engine is switched back to the initial state after the rotating speed is equal to 0;
the slope state machine adopts a slope algorithm, and the calculation method comprises the following steps:
wherein Start _ q _ Str represents the starting oil amount;
q _ Ini represents the initial oil amount;
n _ Real represents the instantaneous engine speed,
q _ Term represents the target oil quantity;
n _ IdleSet represents an idle speed setting value;
start _ n _ StrtRampThres _ C represents a ramp Start speed threshold,
q _ Trans represents the amount of transient oil.
2. The slope control method according to claim 1, characterized in that:
the initial oil quantity is obtained by adding the altitude correction oil quantity to the initial oil quantity base value;
the initial oil mass base value is obtained by calculating an initial oil mass MAP according to the air inlet temperature and the cooling liquid temperature;
the altitude correction oil quantity is obtained by multiplying an initial oil quantity altitude correction oil quantity base value by an initial oil quantity altitude correction coefficient;
the initial oil quantity altitude correction oil quantity base value is obtained by calculating an initial oil quantity altitude correction base MAP according to the air inlet temperature and the cooling liquid temperature;
and the initial oil mass altitude correction coefficient is obtained by calculation through a correction coefficient curve according to the atmospheric pressure.
3. The slope control method according to claim 1, wherein: the idle stable oil quantity is calculated by the idle stable oil quantity MAP according to the temperature of the cooling liquid and the idle set value.
4. The slope control method according to claim 1, characterized in that: and the transitional rotating speed is calculated by the transitional rotating speed MAP according to the calculated target oil quantity and the idle speed set value.
5. A computer-readable storage medium having stored thereon a computer program, characterized in that:
the program is executed by a processor to implement the steps of the method for controlling the start fuel injection amount ramp of a diesel engine based on the instantaneous rotational speed according to any one of claims 1 to 4.
6. A vehicle engine ECU incorporating the computer-readable storage medium of claim 5.
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| CN112576393A (en) | 2021-03-30 |
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