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Engine starting control method used by flexible fuel vehicle

An engine starting, flexible fuel technology, applied in engine control, combustion engine, fuel injection control, etc., can solve problems such as high cost and complex structure, achieve reliable starting, and solve the effect of difficult starting

Inactive Publication Date: 2017-03-29
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fuel system of the flexible fuel vehicle solves the problem of cold start of the flexible fuel vehicle under low temperature conditions by setting a gasoline auxiliary fuel supply system. high

Method used

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  • Engine starting control method used by flexible fuel vehicle
  • Engine starting control method used by flexible fuel vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Engine start control methods used in flex-fuel vehicles such as figure 1 shown, including the following steps:

[0035] 1. Receiving relevant parameters of starting air intake control; relevant parameters of starting air intake control, including ethanol content in fuel;

[0036] 2. If an engine start instruction is received, proceed to step 3;

[0037] 3. If the ethanol content in the fuel is higher than the set content, it is judged that the fuel is a high-ethanol flexible fuel, and step 4 is performed;

[0038] 4. The stepper motor controls the intake bypass valve to close to the minimum opening;

[0039] 5. The starter drives the engine to start working, the fuel injector starts to inject fuel, and the spark plug starts to ignite;

[0040] 6. The stepper motor controls the intake bypass valve to open to the starting target opening;

[0041] 7. If the engine starts successfully, go to step 8; otherwise, go to step 1;

[0042] 8. The engine start is over.

[004...

Embodiment 2

[0048] Based on the engine starting control method used by the flexible fuel vehicle of Embodiment 1, in step 3, if the ethanol content in the fuel is lower than the set content, then it is judged that the fuel is a low ethanol flexible fuel, and the intake bypass is controlled by a stepping motor The valve is pre-opened to the pre-intake opening, and then step five is performed.

[0049] The pre-intake opening is greater than the minimum position opening.

[0050] When the ethanol content in the fuel is lower than the set content, because the fuel contains a certain proportion of gasoline, it will ignite faster and burn faster, and the speed at which the stepping motor is turned on is limited by the hardware itself. Through functional improvement, it can be For the low-content ethanol flexible fuel, conventional air intake control strategies such as opening the throttle valve in advance are used during the starting process. The engine starting control method used in the flex...

Embodiment 3

[0052] Based on the engine start control method used by Liyi’s flexible fuel vehicle, the relevant parameters of the start air intake control also include engine water temperature, engine shutdown time after the last flameout, altitude information, etc.; the method for determining the start target opening is:

[0053] First, set the basic target opening according to the ethanol content in the fuel and the engine water temperature, and then modify the basic target opening according to the engine shutdown time and altitude information after the last flameout to obtain the revised target opening. If the corrected target opening is at the minimum Between the target opening and the maximum target opening, the corrected target opening is used as the starting target opening; if the corrected target opening is smaller than the minimum design opening of the intake bypass valve, the minimum design opening of the intake bypass valve is used is the starting target opening; if the corrected...

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Abstract

The invention discloses an engine starting control method used by a flexible fuel vehicle. After an engine starting command is received, if the ethanol content in fuel is higher than a set content, an air inlet bypass valve is firstly controlled by a stepping motor to be closed to the minimum position opening degree; and after a starter drives an engine to start to work, drives an oil sprayer to start to spray oil and drives an ignition plug to start to ignite, the air inlet bypass valve is controlled by the stepping motor to be opened to the starting target opening degree. By means of the engine starting control method used by the flexible fuel vehicle, sufficient combustible mixed gas can be formed, and reliable starting of the engine is achieved.

Description

technical field [0001] The invention relates to the technology of flexible fuel vehicles, in particular to an engine start control method used in flexible fuel vehicles. Background technique [0002] The fuel mixed with gasoline and alcohol in any proportion is called flexible fuel. Since this kind of fuel replaces part of gasoline with alcohol and reduces the amount of gasoline used, it can reduce the dependence of automobiles on petroleum to a certain extent, and the emission performance is also more prominent. Flexible fuel vehicles (FFV: Flexible Fuel Vehicle) mainly refer to vehicles that can use pure gasoline, pure alcohol fuel, and mixed fuels of gasoline and alcohol fuel in different proportions. Flex-fuel vehicles use ethanol gasoline with an ethanol content of 22% to 100% in the same fuel tank. Compared with gasoline, alcohols have a lower boiling point, which is conducive to the formation of fuel-air mixtures. However, they lack high-volatility components, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/06
CPCY02T10/40
Inventor 刘朝永
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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