PURPOSE: To suppress the temperature rise of an electronic apparatus by fixing an electronic cooling apparatus onto the outer surface of an electronic apparatus for controlling fuel injection which is installed onto the outer wall of a suction pipe and operating the cooling apparatus by a thermal generation apparatus fixed onto the outer surface of an exhaust pipe when the temperature of the electronic apparatus is over a certain temperature.

CONSTITUTION: A fuel injection valve 15 is installed onto the upstream side of a throttle valve 14 for a suction pipe 1, and a control unit 2 equipped with an electronic apparatus for controlling the fuel injection valve is fixed, onto the outer- wall of the suction pipe 1, and an electronic cooling apparatus 3 is fixed onto the outer surface of the control unit 2. A thermal generator 8 is installed onto the outer surface of an exhaust manifold 7, and the output is connected to a temperature judging circuit 12 through a ripple filter 18. When a temperature sensor 22 detects that the temperature of the control unit 2 becomes over a set temperature, the temperature judging circuit 12 supplies the electric power supplied from the thermal generation apparatus 8 into the electronic cooling apparatus 3 to cool the control unit 2.