Engine powered machine

Abstract

An engine powered machine that has a high performance exhaust purification device and in which the temperature in an operation room can be quickly raised to a comfortable temperature. ¢MEANS FOR SOLVING PROBLEMS! The exhaust purification device using a NOx removal catalyst (3) and a reducing agent has a reducing agent heating device (13) for heating the reducing agent, contained in a reducing agent tank (5), by using heat of an engine cooling medium and also has an opening / closing device (14) for controlling the introduction of the engine cooling medium into the reducing agent heating device (13). A controller (15) switches the opening / closing device (14) to a closed state when the temperature of the engine cooling medium is higher than a first predetermined temperature, the temperature ofthe reducing agent in the tank (5) is lower than a second predetermined temperature, and the temperature in the operation room (7) is lower than a third predetermined temperature, and by doing so, the controller (15) increases the amount of flow of the engine cooling medium led to a heat exchanger (8a) of a heating device (8). The construction can preferentially heat the operation chamber (7) ina cold weather to enhance the comfort of an operator.

Description

technical field [0001] The present invention relates to machines (engine power machines) such as construction machines and automobiles that use an engine as a power source, and more particularly to engine power machines having an exhaust gas purifying device that purifies nitrogen oxides in exhaust gas using a denitrification catalyst and a reducing agent. Background technique [0002] As an exhaust gas purification device installed in an engine power machine, it is known that it has a denitrification catalyst attached to an exhaust pipe; The reducing agent stored in the reducing agent tank is sprayed, and in the presence of the denitrification catalyst, the nitrogen oxides are selectively reduced by the reducing agent, and the nitrogen oxides in the exhaust gas are decomposed into harmless nitrogen and water. In addition, as the reducing agent, urea water, an ammonia solution, and gas oil mainly composed of hydrocarbons are used that are hydrolyzed in the exhaust pipe to be...

AI Technical Summary

Problems solved by technology

When the exhaust gas purifying device according to the known example is applied to the engine power machine with a heater, when the switching device is switched to an open state to introduce the engine cooling medium into the reducing agent tank, the engine coolant is introduced into the reducing agent tank. The amount of engine cooling medium in the heater is relatively reduced, so it is difficult to quickly warm up the cabin temperature to a comfortable temperature, so the driver is forced to suffer for a long time

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