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A water cooled internal combustion engine, especially for utility vehicles operated with a gas which is stored in a liquid condition in a fuel tank. The internal combustion engine includes a cooling water cycle containing a thermostat, a cooler and a water pump. A fuel vaporizer is heated by the coo

A water cooled internal combustion engine, especially for utility vehicles operated with a gas which is stored in a liquid condition in a fuel tank. The internal combustion engine includes a cooling water cycle containing a thermostat, a cooler and a water pump. A fuel vaporizer is heated by the cooling water cycle of the internal combustion engine with an air intake preheater likewise being heated by the cooling water cycle. A throttle valve is arranged between the air/gas mixer and working cylinders of the engine. An externally heated water cycle is additionally provided in such a way that the externally heated water cycle is connected functionally in parallel with the cooling water cycle. The water cycles are joined by a conduit with a thermostatic valve being arranged within the conduit so that the two cycles can be switched in such a manner than, in dependence upon the temperature, water from the externally heated water cycle and/or from the cooling water cycle is conducted through the fuel vaporizer and intake air preheater. The externally heated water cycle, when the internal combustion engine is not yet warmed up for operation, and the cooling water cycle, when the internal combustion engine is warmed up for operation, are switched on with respective priority.

대표청구항 ▼

A water-cooled internal combustion engine adapted to be operated on a gaseous fuel stored as a liquid fuel in a fuel tank, the internal combustion engine includes a cooling water circulatory means, a fuel vaporizer means adapted to be heated at least by the cooling water circulatory means, an intake

A water-cooled internal combustion engine adapted to be operated on a gaseous fuel stored as a liquid fuel in a fuel tank, the internal combustion engine includes a cooling water circulatory means, a fuel vaporizer means adapted to be heated at least by the cooling water circulatory means, an intake air preheater means adapted to be heated at least by the cooling water circulatory means, an intake air/gas mixer means, and a throttle valve means arranged between the air/gas mixer means and working cylinders of the internal combustion engine, characterized in that an externally heated water circulatory means is provided, conduit means are provided for communicating the circulatory means with each other, and the thermostatic control valve means are arranged in the conduit means for selectively controlling the communication between the two circulatory means in dependence upon a temperature such that water from at least one of the cooling water circulatory means and the externally heated water circulatory means are conducted through the fuel vaporizer means and the intake air preheater means whereby the externally heated water circulatory means, when the internal combustion engine has not reached a predetermined operating temperature, and the cooling water circulatory means, when the internal combustion engine has reached a predetermined operating temperature, are switched on with respective priority.