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Air-fuel ratio tracking control method and device for lawnmower gasoline engine

A gasoline engine, tracking control technology, applied in engine control, machine/engine, fuel injection control, etc., can solve problems such as difficult operation, large amount of online calculation, complex operation, etc.

Active Publication Date: 2016-08-31
NINGBO AOSHENG MACHINE
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Problems solved by technology

[0003] In order to overcome the deficiencies of the existing lawnmower gasoline engine air-fuel ratio control method, such as complicated operation, difficult operation, and large amount of online calculation, the present invention provides a gasoline engine for lawnmower with simple design, easy online operation, and small online calculation amount. Engine air-fuel ratio tracking control method and device

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  • Air-fuel ratio tracking control method and device for lawnmower gasoline engine
  • Air-fuel ratio tracking control method and device for lawnmower gasoline engine
  • Air-fuel ratio tracking control method and device for lawnmower gasoline engine

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with the accompanying drawings.

[0055] like figure 1 and figure 2 Shown, lawnmower gasoline engine air-fuel ratio tracking control method and device thereof of the present invention, its control method comprises the steps:

[0056] 1) Establish a continuous-time third-order dynamic perturbation model of the air-fuel ratio, fuel injection quantity, rotational speed, and intake air temperature of the gasoline engine of the lawnmower, see formula (1):

[0057] x · ( t ) = Ax ( t ) + B 1 ...

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Abstract

The invention discloses a method and device for air-fuel ratio tracking control over a hay mower gasoline engine. Based on a hay mower gasoline engine air-fuel ratio dynamic disturbance mathematic model, the variable of integration of air-fuel ratio tracking deviation signals is adopted, and an air-fuel ratio disturbance expansion mathematic model is formed; combined with a state feedback controller and the pole assignment technology, a controller of air-fuel ratio tracking object set values is designed. The method and device have the advantages that within a wide range of rotation speed and air inlet temperature changing of the gasoline engine, precise tracking control over the engine air-fuel ratio can be achieved, the air-fuel ratio is kept at the theoretical target value as far as possible in steady and transient operation of the gasoline engine, the fuel efficiency is improved, emission of CO, NOX and other harmful gases is reduced, and the control level over operation of the gasoline engine system is greatly improved.

Description

technical field [0001] The invention relates to a tracking control method and device for the air-fuel ratio of a gasoline engine of a lawnmower. Background technique [0002] With the development of the economy and the improvement of people's living standards, my country's urbanization has continued to expand, and the degree of greening in the suburbs has also increased. A large number of public green spaces such as park lawns, football lawns, and golf course lawns need maintenance such as turf trimming, and the market demand for lawn mowers continues to increase. In order to ensure reliable, economical, and low-pollution operation of gasoline-powered lawnmowers, a key technology is to keep the air-to-fuel ratio (referred to as the air-fuel ratio) of the gasoline engine near the theoretical value as much as possible. However, the actual mowing process is often accompanied by the occurrence of startup, acceleration, deceleration and shutdown, and the intake air temperature o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D28/00F02D41/30
Inventor 沈焕军
Owner NINGBO AOSHENG MACHINE
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