SCR emission-reduction detection control system and method for diesel engine

Abstract

The invention discloses an SCR emission-reduction detection control system and method for a diesel engine. According to the control system, whether the liquid level in a urea tank is lowered or not and whether or not a urea sprayer works normally or not can be detected through a detection control device, and then whether or not a whole SCR emission-reduction system works normally or not is judged;and when it is found that the SCR emission-reduction system is abnormal, a signal is sent back to an ECU system of a whole vehicle in time, and the power of the engine is limited through an ECU of the whole vehicle. By adoption of the SCR emission-reduction detection control system for the diesel engine, the working condition of the SCR system can be detected and recoded on board after the dieselengine is started; the system can be matched with an original on-board diagnosis system to form a dual-detection system, so that the detection reliability is ensured; after the diesel engine is started, the system detects and records the working condition of the SCR system on board to control the power of the whole vehicle, and the power of the engine is limited, so that pollution is prevented from further aggravated; and the system can be additionally arranged easily and rapidly based on an existing on-board detection system, an anti-tamper can be achieved to prevent a driver to refitting the system without permission, and thus, reliable operation of the SCR system is ensured.

Description

【Technical field】 [0001] The invention belongs to the field of aftertreatment of diesel engines, and in particular relates to a diesel engine SCR emission reduction detection control system and a control method. 【Background technique】 [0002] The post-treatment system SCR is to reduce the NO in diesel engine exhaust X One of the effective technologies; Among them, the basic working principle of SCR: NO will be generated during the working process of diesel engine X , the hydrolysis of urea injected into the exhaust pipe will produce NH 3 , the two gases undergo a redox reaction under the action of a catalyst, NO X Can be reduced to N without environmental hazard 2 . [0003] At present, in order to reduce the NO of diesel vehicles X Emissions, the researchers proposed a SCR system control device suitable for automobiles. Although these techniques can reduce NO X Emissions, however, when the SCR system is actually working on the car, many drivers will turn off the SCR...

AI Technical Summary

Problems solved by technology

Although these techniques can reduce NO X Emissions, however, when the SCR system is actually working on the car, many drivers will turn off the SCR during normal driving due to cost reasons, or do not add urea solution; when testing at the testing station, the running SCR system has passed the inspection; In addition, the existing on-board diagnostic system detects the components and working conditions of the SCR system at all times, and alerts the driver when a problem occurs; because it does not affect the normal operation of the car, the driver will not deal with the problem, causing the SCR system to fail. Can not work normally

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