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A valve control method and device for an engine

A valve control and engine technology, applied in engine control, machine/engine, electrical control, etc., can solve the problems of valve reliability reduction, resource waste, user comfort, etc., to improve reliability, avoid overheating damage, and reduce resources wasteful effect

Active Publication Date: 2021-06-22
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a valve control method and device for an engine, which can solve the problems in the prior art that the ECU outputs invalid PWM control signals to the valve, resulting in waste of resources, user comfort, and reduced reliability of the valve.

Method used

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  • A valve control method and device for an engine
  • A valve control method and device for an engine
  • A valve control method and device for an engine

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Embodiment Construction

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0047] It can be known from the background technology that there are many working conditions during the operation of the diesel engine that require the valve to be closed, such as during the regeneration of diesel particulate filters (Diesel particulate filters, DPF). The closed state of the EGR valve means that the control valve reaches the mechanical peak of its opening of 0%. However, due to various reasons such as valve aging, deformation, control accuracy,...

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Abstract

The invention discloses a valve control method and device for an engine. The actual opening of a target valve is collected; and the duty ratio limit corresponding to the actual opening of the valve is queried in a preset duty ratio limit value table. , using the duty cycle limit as the duty cycle limit of the target valve. By giving the valve different duty ratio limits under different opening degrees, the invention avoids the occurrence of overheating damage to the valve while meeting the duty ratio requirement of the engine, improves the reliability of the valve, and reduces unnecessary Waste of resources.

Description

technical field [0001] The invention relates to the field of mechanical control, in particular to a valve control method and device for an engine. Background technique [0002] A diesel engine is an engine that burns diesel to obtain energy release. Among them, exhaust gas recirculation (ExhaustGas Recirculation, EGR) valves, throttle valves and other valve components are important components commonly used in diesel engines. The valve components in diesel engines are generally driven by DC motors, and the electronic control unit (Electronic Control Unit, ECU) outputs a pulse width modulation (Pulse Width Modulation, PWM) control signal of a certain frequency to control the valve opening of the valve components. [0003] During the operation of the diesel engine, there are many working conditions that require the valve to be closed. For example, during the regeneration of diesel particulate filters (Diesel particulate filters, DPF), in order to ensure the smooth progress of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/02
CPCF02D41/0077F02D41/02F02D2041/0022F02D2200/0404F02D2200/101F02D2200/1012
Inventor 栾军山张晨代子阳姚旺
Owner WEICHAI POWER CO LTD
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