KR960038064A - Estimation device and estimation method for catalyst temperature of vehicle - Google Patents

Abstract

The present invention relates to a technique for easily and accurately estimating the temperature of an exhaust purification catalyst provided in a vehicle engine.

Specifically, the cooling water temperature Tws at the start is regarded as the outside temperature equivalent, and the heat radiation amount Tm from the catalyst is estimated based on the cooling water temperature Tws at the start and the vehicle speed VSP, and the time integral STm of the calorific value Tm is calculated. . On the other hand, the intake air amount Q of the engine is regarded as the displacement equivalent value, and on the basis of the intake air amount Q, the hydrothermal amount Tp that the catalyst absorbs heat from the exhaust is estimated. The time integral STp of the hydrothermal amount Tp is calculated. Here, by subtracting the heat radiation amount STm from the hydrothermal amount STp, the calorific value X held by the catalyst is calculated, and by comparing the calorie value X with a predetermined value, it is estimated whether or not the catalyst has reached the active temperature.

Description

Estimation device and estimation method for catalyst temperature of vehicle

As this is a public information case, the full text was not included.

1 is a functional block diagram showing the configuration of the present invention, FIG. 2 is a system diagram showing one embodiment of the present invention, and FIG. 3 is a flowchart showing estimation control of the catalyst temperature in the embodiment.

Claims (6)

A catalyst temperature estimating apparatus for a vehicle estimating the temperature of an exhaust purification catalyst installed in an engine exhaust passage, the apparatus comprising: a startup water temperature detection means for detecting a coolant temperature of an engine at startup and a vehicle speed detection means for detecting a running speed of a vehicle And an intake air amount detecting means for detecting the intake air amount of the engine, and a catalyst temperature estimating means for estimating the temperature of the exhaust purification catalyst based on the detected coolant temperature at the start, the traveling speed of the vehicle, and the intake air amount of the engine. Catalyst temperature estimation apparatus for a vehicle, characterized in that the. The heat dissipation amount estimating means according to claim 1, wherein the catalyst temperature estimating means estimates the amount of heat deprived by the exhaust purification catalyst based on the detected coolant temperature at the start-up and the traveling speed of the vehicle, and the detected air intake amount of the engine. Hydrothermal amount estimating means for estimating the amount of heat absorbed by the exhaust purification catalyst from the exhaust of the engine based on the heat sink; and calorific value for estimating the temperature of the exhaust purification catalyst based on the estimation results of the heat dissipation amount estimating means and the hydrothermal amount estimating means; A catalyst temperature estimation apparatus for a vehicle, comprising the catalyst temperature estimating means. The heat quantity obtained by subtracting the integral value of the heat quantity estimated by the heat dissipation amount estimating means from the integral value of the heat quantity estimated by the hydrothermal amount estimating means to the temperature of the exhaust purification catalyst. An apparatus for estimating catalyst temperature of a vehicle, characterized in that it is calculated as a correlated value. A method for estimating a catalyst temperature of a vehicle for estimating the temperature of an exhaust purification catalyst installed in an engine exhaust passage, the method comprising: detecting a coolant temperature of an engine at startup, detecting a running speed of a vehicle, and detecting an intake amount of an engine And estimating the temperature of the exhaust purification catalyst based on the detected coolant temperature at the start, the traveling speed of the vehicle, and the intake amount of the engine. The method of claim 4, wherein estimating the temperature of the exhaust purification catalyst comprises estimating the amount of heat deprived by the exhaust purification catalyst based on the detected coolant temperature at the start-up and the traveling speed of the vehicle; Estimating the amount of heat that the exhaust purification catalyst absorbs from the exhaust of the engine based on the engine intake amount, and based on the amount of heat deprived by the estimated exhaust purification catalyst and the amount of heat that the exhaust purification catalyst absorbs in the exhaust of the engine. And estimating the temperature of the exhaust purification catalyst. 6. The method of claim 5, wherein estimating the temperature of the exhaust purification catalyst on the basis of the calorific value comprises: an integral value of the amount of heat deprived by the exhaust purification catalyst from the integral value of the amount of heat absorbed by the exhaust purification catalyst from the exhaust of the engine. And calculating the subtracted heat amount as a value correlated with the temperature of the exhaust purification catalyst.