Overheating protection method for motor of valve body and engine post-processing system
An overheating protection and engine technology, applied to combustion engines, internal combustion piston engines, emergency protection circuit devices, etc., can solve problems that affect the service life of the motor, the motor exceeds the temperature limit, and the valve opening is slow, so as to prevent overheating. Temperature failure, avoid failure, ensure the effect of normal operation
Pending Publication Date: 2022-06-03
WEICHAI POWER CO LTD
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Problems solved by technology
However, if there are some abnormal conditions, such as increased exhaust back pressure of the engine, freezing of the valve at low temperature, or aging of the motor, etc., the control current of the EGR valve will continue to increase. If there is no effective motor over-temperature protection strategy, the EGR valve When the motor is driven by a large duty cycle for a long time, the temperature limit of the motor will be exceeded, which will seriously affect the service life of the motor
[0004] At present, there are mainly the following two types of control methods for EGR valve control. One is to ensure instantaneous control, and there is no limit to the duty ratio. The empty ratio is limited to meet the normal control (such as 50%), at this time, the valve opening moves slowly in the transient situation
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[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.
[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element mu...
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The invention discloses an overheating protection method for a motor of a valve body and an engine post-processing system, and relates to the technical field of engine post-processing. The overheating protection method for the motor of the valve body comprises the following steps that the real-time duty ratio of the motor is monitored, and the duty ratio limit value and the first detection time T of the motor are set; when the real-time duty ratio reaches the duty ratio limit value, overheating detection is started; and in the first detection time T, if the number of times that the average value of the real-time duty ratio is greater than or equal to the duty ratio limit value in the second detection time t is greater than a preset number of times, starting overheating protection of the motor. According to the overheating protection method for the motor of the valve body, instant rapid control over the valve plate of the valve body can be met, and an overtemperature fault can be effectively prevented.
Description
technical field [0001] The invention relates to the technical field of engine aftertreatment, in particular to a method for overheating protection of a motor of a valve body and an engine aftertreatment system. Background technique [0002] Exhaust gas recirculation (Exhaust Gas Recirculation), referred to as EGR, is a technology in which the engine cools a part of the exhaust gas after combustion and then introduces it into the intake manifold for re-combustion. The EGR valve is an important component of the EGR system. By adjusting the opening of the EGR valve, the amount of exhaust gas that enters the engine again can be controlled. [0003] When the opening degree of the normal EGR valve is fully opened, the required duty ratio is small, about 30%. Under complex working conditions and strong transients, in order to meet the response speed of the EGR valve, an instantaneous large duty cycle drive may occur, but this situation generally lasts for a short time (usually wit...
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IPC IPC(8): H02H7/085
CPCH02H7/0858H02H7/085Y02T10/40
Inventor 野凯轩栾军山姚旺张晨
Owner WEICHAI POWER CO LTD