Fault alarm method and device for switch solenoid valve
A technology of switching solenoid valve and fault alarm, applied in the direction of silencer, exhaust device, electric control of exhaust treatment device, etc., can solve problems such as no diagnosis method, SCR system can not work normally, etc.
Active Publication Date: 2018-03-09
WEICHAI POWER CO LTD
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Problems solved by technology
When the engine is working normally, the temperature of the engine cooling water is 83-95°C. When the solenoid valve is normally opened, the vehicle urea can be heated to the preset temperature by the engine cooling water, and the SCR system can work normally. Heating to the preset temperature, the SCR system will not work properly when the solenoid valve is abnormally closed due to mechanical failures such as the solenoid valve moving iron chip being stuck
[0005] In the existing technical solutions, only the electrical faults of several solenoid valves, such as the open circuit of the solenoid valve of the urea tank, the short circuit of the solenoid valve of the urea tank, the short circuit of the solenoid valve of the urea tank, and the ground, are only diagnosed. There is no way to diagnose the fault yet
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[0039] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.
[0040] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.
[0041] figure 1 It is a schematic flow chart of a fault alarm method for a switching solenoid valve provided by an embodiment of the present invention. see figure 1 , the switch solenoid valve is ...
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The invention relates to an on-off electromagnetic valve failure warning method and device. The method comprises the steps that during the period that the starting state signal of an on-off electromagnetic valve is the active level and the temperature of a urea solution in a urea tank does not exceed the preset temperature, whether the variation of the temperature of the urea solution in the urea tank between two time moments at an interval of first preset time is smaller than a first threshold value or not is detected; when the variation of the temperature of the urea solution in the urea tank between two time moments at the interval of first preset time is smaller than the first threshold value, a failure warning signal is sent. By means of the technical scheme, during the period that the starting state signal of the on-off electromagnetic valve is the active level and the temperature of the urea solution in the urea tank does not exceed the preset temperature, whether the on-off electromagnetic valve has an abnormal shutdown failure or not can be judged, if abnormal shutdown exits, the failure warning signal is sent, and a user can rapidly check whether the on-off electromagnetic valve has mechanical failures like clamping stagnation of a movable iron core according to the warning signal prompt.
Description
technical field [0001] The invention relates to the field of automatic control, in particular to a method and device for alarming a switch solenoid valve failure. Background technique [0002] Nitrogen oxides in automobile exhaust are not only one of the causes of acid rain, but also have direct harm to human body. The role of urea solution for vehicles is to chemically react with nitrogen oxides in vehicle exhaust to generate non-toxic nitrogen and water, thereby reducing the emission of toxic gases in vehicle exhaust and reducing pollution. [0003] The urea solution for vehicles is generally an aqueous urea solution with a concentration of 32.5%, which can be pyrolyzed above 180°C to produce ammonia (NH 3 ), the temperature is lower than -11.5℃ and starts to freeze. In order to ensure the normal operation of the SCR (Selective Catalytic Reduction, selective catalytic reduction exhaust gas treatment system for vehicles) system, it is necessary to heat the urea for vehicl...
Claims
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IPC IPC(8): F01N11/00F01N3/28
CPCY02T10/40
Inventor 王孝莉王胜郑贯宇王奉双郑碧莹耿磊
Owner WEICHAI POWER CO LTD