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Vehicle double-fuel system oil pump control method

A dual-fuel system and control method technology, applied in fuel injection control, electrical control, engine control, etc., can solve problems such as oil pump burnout, achieve the effects of protecting the oil pump, avoiding continuous operation, and improving the service life of equipment

Active Publication Date: 2015-03-25
CHERY AUTOMOBILE CO LTD
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Problems solved by technology

Therefore, in this plug-in control method, the working state of the oil pump is still controlled by the original ECU. In the CNG mode, the fuel pump is mostly still in the working state. This continuous operation of the oil pump will generate high temperature when the fuel level in the fuel tank is low. , and this high temperature may cause the oil pump to burn out

Method used

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  • Vehicle double-fuel system oil pump control method
  • Vehicle double-fuel system oil pump control method
  • Vehicle double-fuel system oil pump control method

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Embodiment Construction

[0028] In the vehicle dual-fuel system oil pump control method, the dual fuels are fuel oil and gas. The fuel is generally gasoline or diesel, and the gas is generally natural gas. The oil pump control method includes the following five control strategies, which are the KEY-ON mode strategy flow chart and start control in sequence. Strategy flow chart, automatic switching from fuel oil to gas control strategy flow chart, automatic gas switching to fuel oil control strategy flow chart, gas switching to fuel oil control strategy flow chart after startup.

[0029] Such as figure 1 As shown in the flow chart of the KEY-ON mode strategy, this working mode is only a systematic self-check to ensure that the fuel pump is working normally. After the key is turned from KEY-OFF to KEY-ON, the fuel pump will run for 5 seconds to ensure fuel supply. The normal establishment of the oil pressure of the oil system meets the fuel starting requirements.

[0030] Such as figure 2 As shown, th...

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Abstract

The invention discloses a vehicle double-fuel system oil pump control method. The double fuel refers to the fuel oil and fuel gas. The control method comprises the steps of a KEY-ON pattern strategy, a starting control strategy, a control strategy for switching fuel oil into fuel gas after starting is conducted, a control strategy for automatically switching fuel oil into fuel gas and a strategy of automatically switching fuel gas into fuel oil. The vehicle double-fuel system oil pump control method has the advantages that an oil pump can be effectively protected, the oil pump is prevented from working continually in the switching process, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to the field of vehicle fuel control, in particular to a method for controlling a fuel pump of a dual-fuel vehicle. Background technique [0002] With the increasing shortage of global energy, more fuel resources have been developed and utilized, especially in the current domestic taxi market, gasoline-CNG dual fuel system has been widely used, and its low price advantage has also been welcomed and recognized by the market. [0003] At present, the dual-fuel engine control unit (ECU) mostly uses an external gas control module to refit the gas system. This modification mode cannot realize too many modifications to the control of the original ECU. System-related signals are corrected to realize gas system switching. Therefore, in this plug-in control method, the working state of the oil pump is still controlled by the original ECU. In the CNG mode, the fuel pump is mostly still in the working state. This continuous operation of the...

Claims

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Application Information

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IPC IPC(8): F02D19/06F02D41/02F02D41/06F02D41/22
CPCY02T10/30Y02T10/40
Inventor 唐为义
Owner CHERY AUTOMOBILE CO LTD
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