Electronic water pump control method

Abstract

The invention belongs to the technical field of automobile control, and provides an electronic water pump control method, which comprises the following steps that an ECU (Electronic Control Unit) calculates indicated mean effective brake pressure according to an engine estimation model if an engine runs; if the indicated mean effective brake pressure is lower than first pressure, an electronic water pump does not work; if the indicated mean effective brake pressure is not lower than the first pressure and not higher than second pressure, the electronic water pump works, and practical temperature after inter-cooling is detected; if the practical temperature is higher than target temperature, rotating speed of the electronic water pump is regulated by adopting closed loop control until an absolute value of a difference between the practical temperature and the target temperature is lower than a preset value; if the indicated mean effective brake pressure is higher than the second pressure, the electronic water pump works at rated rotating speed. According to the method, the ECU calculates the indicated mean effective brake pressure according to the engine estimation model, and the indicated mean effective brake pressure is compared with a minimum load threshold of the indicated mean effective brake pressure to control the electronic water pump to ensure that a booster and an inter-cooler work at optimal temperature, save energy resources and improve economy of fuel.

Description

technical field [0001] The invention belongs to the technical field of automobile control, and in particular relates to an electronic water pump control method. Background technique [0002] At present, supercharged direct injection engines generally have an independent cooling system, including electronic water pump, supercharger, intercooler, intercooler radiator and connecting pipelines. When the vehicle starts, the electronic control unit sends a signal to control the electronic water pump. Running at a fixed speed, the coolant in the intercooler radiator is sent to the supercharger and intercooler through the electronic water pump (intercooler and turbocharger are connected in parallel to an independent cooling system), and then returns to the intercooler radiator to form cooling water circulation, so as to achieve the effect of cooling the supercharger and intercooler. In the existing control mode, after the car is started, the electronic control unit controls the ele...

AI Technical Summary

Problems solved by technology

In the existing control mode, after the car is started, the electronic control unit controls the electronic water pump to run at a fixed speed, which cannot match the flow of coolant according to the actual use of the supercharger and intercooler, and it is difficult to ensure that the supercharger and intercooler The cooler works at the optimum temperature, while the electronic water pump has been running at a fixed high speed, and it is in a state of high power consumption for a long time, which wastes energy and is not conducive to the fuel economy of the engine

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