| 摘要 |
PURPOSE:To always keep warm-up time appropriate despite the fluctuation in the humidity of intake air, by providing a humidity sensor and a warm-up sensor to increase the feed of a mixture during the warm-up as the humidity goes up. CONSTITUTION:A voltage (b) corresponding to the state of warm-up of an engine is produced by a warm-up voltage generator circuit 13 on the basis of the output of a warm-up sensor 12 which detects the temperature of cooling water of the engine. The voltage (b) is compared with a reference voltage (c) by a comparator circuit 15. When the voltage (b) is lower than the other (c), a three-way changeover valve 10 is shifted to connect a passage 9 to an intake passage 1 to introduce intake negative pressure into the chamber 8c of the diaphragm unit 8 of a mixture increasing device 20 to heighten the degree of opening of a throttle valve 5 through an operating rod 7 and an engaged lever 6. A humidity sensor 16 detects the humidity of intake air. A voltage (f) based on the output of the sensor 16 is compared with a reference voltage (g) by a comparator circuit 19. When the voltage (f) is higher than the other (g), a solenoid 11 is energized to attract a plunger 11a to enlarge the range of movement of a diaphragm 8a. |
