Device and method for controlling urea injection system of diesel engine
A technology of urea injection system and diesel engine, which is applied in the direction of mechanical equipment, engine components, combustion engine, etc., can solve the problems affecting the conversion rate of nitrogen oxides, errors, deviations, etc., so as to reduce the calibration workload, reduce deviations, and improve The effect of efficiency and functionality
Active Publication Date: 2012-11-07
WEICHAI POWER CO LTD
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In addition, based on the existing PID control strategy, under certain operating conditions of the engine, there will be a large deviation between the actual value of the urea pressure and its target value, which leads to the actual injection amount of urea in the urea injection system. There is a large error between the target injection quantities of urea, which directly affects the conversion rate of nitrogen oxides in the engine aftertreatment SCR system
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[0028] Hereinafter, the device and method for controlling the urea injection system provided by the present invention will be described in detail through embodiments with reference to the accompanying drawings. It should be understood that these embodiments are given only to enable those skilled in the art to better understand and implement the present invention, rather than to limit the scope of the present invention in any way.
[0029] In addition, the term "operating condition parameter" used herein refers to any value of a physical quantity that can indicate the (target or actual) physical state or operating condition of the engine. Also, herein, "parameter" and the physical quantity it represents may be used interchangeably. For example, "the parameter indicating the flow of urea" and "the flow of urea" have equivalent meanings herein. Moreover, in this paper, assuming that P represents a specific physical quantity, then Indicates the derivative of P to time, that is,...
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The invention discloses a device and method for controlling a urea injection system of a diesel engine. The device comprises a working condition parameter acquiring device, a control-amount determining device and a driving signal determining device, wherein the working condition parameter acquiring device is used for acquiring working parameters which are relevant to the urea injection system; the control-amount determining device is coupled with the working condition parameter acquiring device and is used for determining the control amount for controlling the urea injection system according to the working condition parameters, a target value of urea pressure in a urea buffer chamber and a control model which is designed based on a physical model for representing the urea injection system, and the control-amount is the rotation speed of a urea pump driving motor; and the driving signal determining device is coupled with the control amount determining device, and is used for determining the driving signal for driving the urea pump driving motor according to the determined control-amount. According to the invention, the implementing method is suitable for working processes under anyworking condition, more accurate urea injection pressure and rapid response can be realized, the deviation between urea pressure and the target value of the urea pressure is lowered, the calibrated work amount is reduced, and the function of the system is improved.
Description
technical field [0001] The present invention generally relates to the technical field of diesel engines, and more particularly relates to an apparatus and method for controlling a urea injection system of a diesel engine. Background technique [0002] Since its inception, diesel engines have been widely used in various power plants, ships and vehicles due to their good power, economy and durability. Diesel engines have many advantages over gasoline engines: lower exhaust emissions, better acceleration at lower speeds, lower average fuel consumption and more driving pleasure. However, particulate and nitrogen oxide emissions are the two most dominant pollutants in tailpipe emissions compared to gasoline engines of the same power. . [0003] At present, the technology to reduce automobile exhaust emissions to meet emission standards usually uses exhaust after-treatment to reduce pollutant emissions, and urea selective catalytic reduction (SCR) is the most practical method, w...
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IPC IPC(8): F01N9/00F01N3/20
CPCY02T10/47Y02T10/40
Inventor 胡广地孙少军佟德辉郭圣刚孙永亮
Owner WEICHAI POWER CO LTD