Expansion Kalman filtering based multiple temperature sensor integrating method

Abstract

The invention discloses an expansion Kalman filtering based multiple temperature sensor integrating method. During temperature measurement and calculation of a heater, model calculation and measurement values of different temperature points are integrated, temperature measurement precision is improved and system safety operation is ensured when temperature sensor failure occurs. According to the invention, theoretical mutual relation of the temperature points and system input can be reflected and prior temperature sensor information can be utilized fully. Besides, the calculation amount of a control device is not large and real time data update can be implemented. When temperature sensors are not disposed in a to-be-detected position, the temperature of the to-be-detected position can be estimated by utilizing data integration of a system model and measurement values. According to the invention, hardware design difficulties and hardware circuit cost are reduced and the temperature of the to-be-detected point can be estimated correctly. When single-point temperature sensor failure occurs, temperature of each temperature point can be estimated according to data of other temperature sensors and a system model, so that safe and effect operation of a heating system is ensured and system safety level is improved.

Description

technical field

[0001] The invention relates to a temperature acquisition and estimation method for a heater of an electric vehicle or a hybrid vehicle, in particular to a multi-temperature sensor fusion method based on an extended Kalman filter, which belongs to the technical field of automobile equipment. Background technique

[0002] The heating system of the vehicle needs to provide heat quickly and accurately through the heating medium. Due to insulation and other requirements, the temperature sensor of the heating system cannot be directly connected to the heating medium or heating element. The water temperature sensor is generally outside the waterway, and the temperature of the heating element and the heating element There is also a layer of film between the sensors, and the temperature measurement values ​​will have different differences under different working conditions. These errors are also related to the structural design of the heating system, the selection of ...

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