Gas engine control method and device

Abstract

The invention provides a gas engine control method and device which are applied to the technical field of engines. The method comprises the steps that after target parameters representing the running state of a gas engine are obtained, if the target parameters meet preset control conditions, a current oxygen closed-loop control correction factor and a current oxygen closed-loop control learning factor are obtained; according to the current oxygen closed-loop control correction factor and the current oxygen closed-loop control learning factor, whether the gas engine meets a preset correction condition or not is judged; and if the gas engine meets the preset correction condition, the required air charge and the required EGR rate of the gas engine are corrected according to the current oxygen closed-loop control learning factor. Compared with the prior art, the scheme does not depend on messages to transmit the fuel information any more, so that the scheme can be suitable for a vehicle which cannot send messages between a whole vehicle controller and an engine controller, and the problems of engine overpower, knocking, insufficient power, misfire and the like are solved.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a gas engine control method and device. Background technique [0002] Since the gas composition and calorific value of natural gas at different filling stations in the market are often different, every time the vehicle is filled with gas, the performance parameters of natural gas will change. If the same control data is used to control the operation of the gas engine, the gas engine will be in use When natural gas with high calorific value is used, problems such as engine overpower and knocking occur, while when natural gas with low calorific value is used, problems such as insufficient engine power and misfire occur. [0003] In practical applications, most engine controllers have the function of natural gas self-adaptive control, and adopt a control process corresponding to the natural gas composition of different gas compositions. The premise of the activation of ...

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Problems solved by technology

[0004] However, the inventor found that not all vehicles currently support communication between the vehicle controller and the engine controller in the form of messages, resulting in fuel information It cannot be transmitted to the engine controller, which will inevitably cause the gas engine to be unable to judge whether it is necessary to activate the natural gas adaptive control function, and it will not be able to solve the problems of engine overpower, knocking, underpower and misfire

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