Engine coolant temperature control method and system

Abstract

The present invention discloses a technical scheme adopted in the present invention in order to achieve the above purpose: the engine coolant temperature control method: step 1, system self-inspection; step 2, real-time acquisition of engine speed signal, engine load signal, exhaust air-fuel ratio signal, intake air temperature signal, water temperature signal, vehicle speed signal and knock signal; step 3, establish exhaust temperature model and knock model; step 4, calculate engine exhaust temperature in real time through the exhaust temperature model, and calculate knock through the knock model Angle retreat; step 5, output a control signal to the electronic thermostat according to the calculation result. With this method, the coolant temperature can be directly linked to the combustion state of the engine, the control is more accurate, and the fuel economy is lower. More efficient, accurate and stable.

Description

technical field [0001] The invention belongs to the field of internal combustion engines for vehicles, and relates to an engine cooling system, in particular to a cooling liquid control system and method with an electronic thermostat. Background technique [0002] Engine thermal management technology is currently one of the important technical means to increase engine power density, improve economy and reliability, and is also an important direction for the development of intelligent engine control technology. Advanced engine thermal management technology can make the engine work in the optimal temperature range under different working conditions, thus providing indicators such as engine fuel economy, power performance, car ride comfort and emissions. [0003] Engine intelligent thermal management system is generally composed of electric water pump, fan, electronic thermostat, control unit (ECU) and other components, and the control system adopts closed-loop feedback control...

AI Technical Summary

Problems solved by technology

[0004] However, due to the complex operating conditions of the engine and the many interference factors of the controlled object in the traditional engine thermal management system, and the long response time of the execution unit, the control of the engine coolant temperature often has a large gap with the target water temperature. In particular, when the engine operating conditions change greatly, the actual water temperature tends to fluctuate greatly

In addition, the target water temperature algorithm based on engine speed, load, vehicle speed, and intake air temperature also has more redundant calculations and mismatches in engine operating conditions. Under various environments and conditions, the target water temperature cannot be at The temperature at which the engine works best

In view of this, some engine thermal management systems adopt the control method of dual water temperature sensors to increase the method of collecting the water temperature of the radiator all the way to achieve the accuracy of the target water temperature control, but this kind of system undoubtedly increases the complexity of the system and the product. cost

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