RADIATOR COOLING FAN CONTROLLER

• Main Author: NOBA MASAHIKO
• Format: Patent
• Language: English
• Published: 19.11.1986
• Subjects: ARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING,OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODSSPACES OF VEHICLES; BLASTING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; COOLING OF INTERNAL-COMBUSTION ENGINES; COOLING OF MACHINES OR ENGINES IN GENERAL; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; ENGINE PLANTS IN GENERAL; GENERATION; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; STEAM ENGINES; TRANSPORTING; VEHICLES IN GENERAL; WEAPONS

PURPOSE:To improve the service life of a relay by delaying the operation of a control circuit for a large electric current on switching a control circuit from a small electric current to a large electric current on start, in the control of the revolution of a cooling-fan by an electric-current control circuit which is selected in accordance with the engine operation condition. CONSTITUTION:A small motor 16 and a large motor 17 for driving two radiator cooling fans are controlled by a controller, and said controller is constituted of a cooling-fan driving part 38, relay part 40 and an air-conditioner driving part 42. Said cooling-fan driving part 38 is equipped with an air conditioner magnet switch 32, air conditioner high voltage sensor 34, gates 50-55 for the communication in accordance with the output signal of a water temperature sensor 36, and a gate 57 for the communication in accordance with the operation states of the motor 16 and 17. Further, a delay element 70 is provided which delays the operation of a control circuit for large electric current for a prescribed time when the variation of the operation condition corresponding to the switching of the control circuit form a small electric current to a large electric current on start is detected from the output of an AND gate 59.