Brushless DC electronic water pump controller with fault diagnosis function and diagnosis method

Abstract

The invention provides a brushless DC electronic water pump fault diagnosis system, which comprises an observer and a fault analysis module, wherein the observer inputs a motor angular velocity and control voltage, and a load torque observation value is obtained; the motor angular velocity is actually measured through a sensor, and the control voltage is obtained through an original brushless DC electronic water pump control system; the fault analysis module comprises a water pump operation fault analysis module; the water pump operation fault analysis module is used for comparing the load torque observation value obtained by the observer and a set load torque range, when the obtained load torque observation value is not in the load torque range, fault is judged to happen to operation of the water pump, and a plurality of load torque observation values are acquired in the case of normal water pump operation, an arithmetic mean value and a standard deviation are calculated, appropriate multiples are selected, and thus the load torque range is obtained. Detection output of the sensor is only used for data calibration, an observer model is built, and fault diagnosis is carried out on the water pump.

Description

technical field [0001] The invention belongs to the technical field of automobile engine cooling systems, and in particular relates to a brushless DC electronic water pump controller with fault diagnosis function and a diagnosis method. Background technique [0002] The brushless DC motor water pump uses the principle of a permanent magnet brushless DC motor. The impeller is added to the rotor, and the shell structure is designed to make the liquid centrifugally move. Because there is no carbon brush friction, no sparks will be generated. . It has the characteristics of high efficiency, low power consumption, longer life than brushed motors, and low noise. Therefore, brushless DC motor water pumps are widely used in the automotive industry. [0003] At present, traditional mechanical water pumps are mostly used in the cooling system of automobiles. However, with the development of new energy vehicles and the country's increased support for new energy vehicles, more and mor...

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Problems solved by technology

[0003] At present, traditional mechanical water pumps are mostly used in the cooling system of automobiles. However, with the development of new energy vehicles and the country's increased support for new energy vehicles, more and more pure electric vehicles have been put on the market. However, traditional mechanical water pumps It is not convenient to be used in pure electric vehicles, so the brushless DC electronic water pump has been widely used and has a very good market prospect

[0004] However, due to various reasons, the water pump will be idling or blocked during operation, which will not only cause damage to the water pump itself, but more seriously, the heat-generating components in the car will be overheated due to insufficient coolant in the cooling system, resulting in greater damage and life-threatening However, the existing brushless DC electronic water pumps have not effectively diagnosed the possible faults of the water pump, especially the stalled and dry running faults that may lead to fatal consequences in the cooling system

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