Warming-up system of a car engine

A warming-up system of a car engine comprising:

• a carburetor housing including an air intake passage defined inside and a venturi portion formed at a part of the intake passage so as to reduce the cross-sectional area of the intake passage;
• a main nozzle for injecting fuel into the venturi portion of the carburetor housing;
• a throttle valve in the intake passage located on the lower-course side of the main nozzle and adapted to be shifted between a closed position where the intake passage is opened to a minimum degree and an open position where the intake passage is opened to a maximum degree;
• fuel resupply means for feeding auxiliary fuel into the intake passage, said fuel resupply means including an auxiliary nozzle disposed in the intake passage and an electromagnetically-operated fuel resupply pump for delivering the auxiliary fuel toward the auxiliary nozzle;
• rotation detecting means for detecting the rotational frequency of the engine and delivering an electrical rotation signal corresponding to the rotational frequency;
• position detecting means for determining whether or not the throttle valve is in the closed position, said position detecting means being adapted to deliver an electrical open signal when the throttle valve is in the open position;
• and
• control circuit means for controlling the drive of the fuel resupply pump in response to the signals from the rotation detecting means and the position detecting means, said control circuit means including a decision circuit for determining, in accordance with the rotation signal from the rotation detecting means, whether the engine is in a cranking state or whether the engine is in a complete detonation state such that the engine maintains its rotation for itself, and a driver circuit adapted to deliver a first drive signal for driving the fuel resupply pump to cause a predetermined quantity of auxiliary fuel to be injected from the auxiliary nozzle when the engine is determined to be in the complete detonation state by the decision circuit, and to deliver a second drive signal for driving the fuel resupply pump so that a larger quantity of auxiliary fuel than that injected from the auxiliary nozzle in accordance with the first drive signal is injected from the auxiliary nozzle when the engine is in the complete detonation state and if the open signal is supplied from the position detecting means.