Control method of engine rapid warm-up system

Abstract

An engine rapid warm-up system includes cooling water circulating through an engine 1, a radiator 2 introducing the cooling water to be cooled, a heat accumulator 3 storing the cooling water heated by the engine 1, and a pipe 6 and a water pump 7 that circulate the cooling water through the engine 1, the radiator 2 and the heat accumulator 3. In the system, high temperature cooling water that is stored in the heat accumulator 3 is controlled to be sent to and warm up the engine 1 at engine start, heat of exhaust gas is controlled to recover so that the cooling water obtained after heat recovery is circulated through and warms up the engine 1.

Description

TECHNICAL FIELD[0001]The present invention relates to a control method of an engine rapid warm-up system, and particularly it relates to a control method of an engine rapid warm-up system that effectively warms up an engine by utilizing high temperature cooling water stored in a heat accumulator and recovering heat of exhaust gas at engine start and circulate the cooling water through both of the heat accumulator and a radiator after engine warm-up.BACKGROUND OF THE INVENTION[0002]In general, in a water cooled engine of a motor vehicle, cooling water that is cooled down by a radiator is supplied to the water cooled engine through a cooling water supply passage, and the cooling water that is heated by the engine is returned through the cooling water return passage to the radiator, where the cooling water is cooled down due to heat transfer between the cooling water and the open air.[0003]In such a water cooled engine, there is a problem in that startability of the engine deteriorates...

AI Technical Summary

Benefits of technology

[0009]In the control method of the engine rapid warm-up system, the control method is constructed so that the high temperature cooling water that is stored in the heat accumulator is sent to the engine to warm up the engine. Therefore, the high temperature cooling water can accelerate the warm-up of the engine, so that the engine can be surely started during the winter season and in cold regions.

[0010]In addition, the control method is constructed so that the heat of the exhaust gas is recovered after the engine start, and the high temperature cooling water obtained after the heat recovery is circulated to the engine. Therefore, the high temperature cooling water can rise the temperature of the engine to an appropriate temperature in early stage. In a case of using an engine with an electronic fuel injection, an idle engine speed can early be kept stable, its fuel efficiency being improved.

Problems solved by technology

The technology disclosed in the patent application, however, cannot avoid reduction in the temperature of the cooling water in the heat accumulator over time because of the limit of capacity of the heat accumulator, although the high-temperature cooling water stored in the heat accumulator can warm up the engine.

The temperature of the cooling water gradually increases after the engine start, but it still takes a certain time to reach to an appropriate temperature.

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