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Method and device for controlling engine throttle valve

A control method and throttle valve technology, applied in the direction of engine control, machine/engine, mechanical equipment, etc., to achieve the effect of reducing intake air volume, increasing temperature, and reducing nitrogen oxides that cannot be effectively eliminated

Active Publication Date: 2017-06-27
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a control method and device for an engine throttle valve, so as to increase the exhaust gas temperature, thereby reducing the ineffective elimination of nitrogen oxides that may occur due to the exhaust gas temperature being too low, and the urea solution Formation of hard-to-remove crystals

Method used

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  • Method and device for controlling engine throttle valve
  • Method and device for controlling engine throttle valve
  • Method and device for controlling engine throttle valve

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0056] see figure 1 , the present invention provides the first embodiment of the control method of the engine throttle valve, this embodiment specifically includes:

[0057] S101: Receive the detected exhaust gas temperature of the engine, and if the exhaust gas temperature is lower than a first threshold, execute S102.

[0058] Here, the first threshold can be set according to the critical temperature that can cause the reduction reaction of the urea solution. Therefore, when the exhaust gas temperature is lower than the first threshold, it means that the current exhaust temperature of the engine cannot cause the urea solution to undergo a reduction reaction, so the nitrogen oxides cannot be effectively eliminated, and the urea solution will also be deposited inside the SCR catalyst.

[0059] The subject of execution of this step may be a controller, and the controller may be an ARM, FPGA, an engine electronic control unit (Electronic control unit, ECU) or the like. Therefo...

no. 2 example

[0073] see image 3 , the present invention provides the second embodiment of the control method of the engine throttle valve, this embodiment specifically includes:

[0074] S301: Receive the detected exhaust gas temperature of the engine and the detected exhaust flow rate of the engine, and if the exhaust gas temperature is lower than a first threshold, perform S302.

[0075] Here, the execution sequence of receiving the exhaust gas temperature and receiving the exhaust gas flow rate is not limited, and may be executed simultaneously or sequentially.

[0076] The execution subject of this embodiment may be a controller, and the controller may be an ARM, FPGA, ECU, or the like. Therefore, this step may specifically be that the controller receives the exhaust gas flow of the engine detected by the flow detector. The flow detector may perform the above detection and sending steps after receiving the flow detection instruction sent by the controller, or may detect the exhaust ...

no. 3 example

[0087] see Figure 5 , the present invention provides the third embodiment of the control method of the engine throttle valve, this embodiment specifically includes:

[0088] S501: Receive the detected exhaust gas temperature t1 of the engine and the temperature t2 detected by the temperature sensor installed on the engine, if the exhaust gas temperature t1 is lower than the first threshold T1 and the temperature detected by the temperature sensor is The temperature t2 is not lower than the second threshold T2, execute S502, if the exhaust gas temperature t1 is lower than the first threshold T1 and the temperature t2 detected by the temperature sensor is lower than the second threshold T2, execute S503, if the exhaust gas If the air temperature t1 is not lower than the first threshold T1 and the temperature t2 detected by the temperature sensor is lower than the second threshold T2, execute S504.

[0089] In fact, a temperature sensor is usually installed on the engine to det...

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Abstract

The present invention provides a control method and device for an engine throttle valve. The method includes: receiving the detected exhaust temperature of the engine; if the exhaust temperature is lower than a first threshold, correcting The intake air volume setting value of the throttle valve; the corrected intake air volume setting value is smaller than the intake air volume setting value before correction, and the lower the exhaust gas temperature, the corrected intake air volume setting value The smaller the value is; the opening of the throttle valve of the engine is controlled based on the difference between the corrected intake air volume setting value and the actual intake air volume of the throttle valve. It can be seen that the present invention realizes that when the exhaust gas temperature is lower than a predetermined threshold value, the exhaust gas volume setting value is reduced according to the exhaust gas temperature, thereby reducing the intake air volume of the engine, thus increasing the exhaust gas temperature and reducing the The nitrogen oxides cannot be effectively eliminated due to the low exhaust gas temperature, and the urea solution forms difficult-to-remove crystals.

Description

technical field [0001] The invention relates to the field of electric control, in particular to a control method and device for an engine throttle valve. Background technique [0002] A throttle valve is installed on the intake pipe of the engine to control the intake flow of the engine. At present, when controlling the throttle valve of the engine, the set value of the intake air volume is obtained according to the current speed of the engine and the fuel injection volume, and the difference between the actual intake air volume of the throttle valve and the set value of the intake air volume is determined to Adjust the opening of the throttle valve. [0003] In fact, since the exhaust gas emitted by the engine includes harmful substances such as nitrogen oxides, an SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) catalyst is usually installed on the exhaust pipe of the engine to eliminate nitrogen oxides. The SCR catalyst produces ammonia through urea so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D9/08
Inventor 王奉双刘伟达张素英李俊普
Owner WEICHAI POWER CO LTD