Overheating protection method for motor of air inlet throttle valve and engine post-processing system
A technology of air intake throttling and overheating protection, which is applied in the direction of combustion engine, electric motor control, internal combustion piston engine, etc. It can solve the problem that the opening of the air intake throttle valve is slow and cannot meet the transient state of the intake air throttle valve. Demand and other issues to achieve the effect of ensuring effectiveness, preventing motor over-temperature faults, and ensuring conversion efficiency
Pending Publication Date: 2022-07-12
WEICHAI POWER CO LTD
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Problems solved by technology
However, such a restriction will cause the valve opening of the air intake throttle valve to move slowly under transient conditions, which cannot meet the transient demand of the air intake throttle valve.
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[0027] 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.
[0028] 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, and 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 must...
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The invention discloses an overheating protection method of a motor of an air inlet throttle valve 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 air inlet throttle valve comprises the following steps that the real-time air inlet temperature of an air inlet channel and the real-time duty ratio of the motor are monitored; the duty ratio limit value, corresponding to the current air inlet temperature, of the motor is obtained; whether the current duty ratio of the motor is larger than or equal to the duty ratio limit value, corresponding to the current air inlet temperature, of the motor or not is judged; and if yes, the duration when the current duty ratio of the motor is larger than or equal to the duty ratio limit value of the motor corresponding to the current air inlet temperature is monitored, and if the duration is larger than first preset time, the maximum duty ratio of the motor is limited. The transient change requirement of the air inlet throttle valve can be met, the motor overtemperature fault of the air inlet throttle valve can be prevented, and the effectiveness of an engine aftertreatment system is guaranteed.
Description
technical field [0001] The invention relates to the technical field of engine after-treatment, in particular to a method for overheating protection of a motor of an intake throttle valve and an engine after-treatment system. Background technique [0002] The engine post-processing system uses the intake throttle valve to realize the thermal management function. Due to the complexity of the vehicle operating conditions, the instantaneous change of the demand opening of the intake throttle valve is also large, which requires the intake throttle valve. The input current (or duty cycle) of the motor is large, but excessive current for a long time will cause the motor to burn out. [0003] At present, in order to prevent the motor that drives the intake throttle valve from burning out, the maximum duty ratio of the motor is directly limited, so that it can meet the normal control. However, such a limitation will cause the valve plate opening of the intake throttle valve to act s...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02P29/60H02P29/032H02P29/024
CPCH02P29/60H02P29/032H02P29/024Y02T10/40
Inventor 野凯轩栾军山张红倩张晨
Owner WEICHAI POWER CO LTD