Temperature detection method for air inlet of engine air cylinder

Abstract

The invention provides a temperature detection method for an air inlet of an engine air cylinder, which belongs to the technical field of automobile engines. The temperature detection method solves the problem that the detection method in the prior art cannot accurately estimate the temperature of the air inlet of the air cylinder of an independent double VVT (Variable Valve Timing) engine under different conditions. The temperature detection method for the air inlet of the engine air cylinder comprises the steps of receiving signals transmitted by an air intake VVT camshaft position sensor for detecting an air intake VVT phase, an air exhaust VVT camshaft position sensor for detecting an air exhaust VVT phase, an air intake manifold pressure sensor for detecting air intake manifold pressure and a temperature sensor for detecting air intake manifold temperature through an engine ECU (Electronic Control Unit) respectively, assigning the signals to an air inlet temperature model of the air cylinder set in the engine ECU, and obtaining the temperature of the air inlet of the air cylinder through the air inlet temperature model of the air cylinder. The detection method can improve the estimation precision in low load and high load areas, and is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of engines and relates to a method for detecting the temperature of an engine cylinder intake port. Background technique [0002] With the continuous development of the economy, people's living standards continue to improve, and the number of cars is increasing. Cars have gradually entered the families of ordinary people. For ordinary people, they often hope to buy a car that is fuel-efficient and of better quality. The heart of the car, the engine technology is constantly improving with the development of industrial technology. The temperature of the engine cylinder intake air port determines the distribution and state of the mixture gas in the initial stage of combustion. This temperature determines the temperature of the intake air and the air passage. The degree of gasification of the injected fuel directly determines the uniformity and dispersion of the mixture in the combustion chamber, which will ulti...

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Problems solved by technology

[0002] With the continuous development of the economy, people's living standards continue to improve, and the number of cars is increasing. Cars have gradually entered the families of ordinary people. For ordinary people, they often hope to buy a car that is fuel-efficient and of better quality. The heart of the car, the engine technology is constantly improving with the development of industrial technology. The temperature of the engine cylinder intake air port determines the distribution and state of the mixture gas in the initial stage of combustion. This temperature determines the temperature of the intake air and the air passage. The degree of gasification of the injected fuel directly determines the uniformity and dispersion of the mixture in the combustion chamber, which will ultimately affect the quality and stability of combustion. Therefore, the temperature information of the cylinder intake port is very important in the electronic control unit (ECU) of the engine. Important, but existing product engines are generally equipped with limited sensors, such as intake manifold pressure sensors and temperature sensors, usually not equipped with cylinder intake port temperature sensors, which requires the engine electronic control unit (ECU) to be able to use A good cylinder inlet temperature model, but through the existing sensor information, only the cylinder inlet temperature of a non-VVT engine or a non-independent dual VVT engine can be estimated, but the cylinder inlet temperature of a dual independent VVT engine cannot be accurately estimated. The air port temperature will have a large deviation

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