초록 ▼

An after-burner heated catalyst control system and associated control circuit for controlling operation of an after-burner heated catalyst. The control circuit has an air pump motor, a spark plug, and a fuel injector, while the catalyst is disposed within an exhaust passageway of the engine. The con

An after-burner heated catalyst control system and associated control circuit for controlling operation of an after-burner heated catalyst. The control circuit has an air pump motor, a spark plug, and a fuel injector, while the catalyst is disposed within an exhaust passageway of the engine. The control circuit further includes an apparatus for controlling operation of and pulse wave modulating the air pump motor, one spark plug, and fuel injector. An RS232 interface is provided for transmitting and receiving data from and to the control circuit. In addition a method is provided for controlling a temperature of an after-burner heated catalyst and adjusting adaptively the pulse wave modulation of the air pump motor, spark plug, and fuel injector.

대표청구항 ▼

[ What is claimed is:] [1.] In an after-burner heated catalyst control system and an associated control circuit for controlling an after-burner heated catalyst, the after-burner heated catalyst control system having an air pump motor, a spark plug, and a fuel injector each having a signal frequency

[ What is claimed is:] [1.] In an after-burner heated catalyst control system and an associated control circuit for controlling an after-burner heated catalyst, the after-burner heated catalyst control system having an air pump motor, a spark plug, and a fuel injector each having a signal frequency and a duty cycle, the control circuit comprising:a device for controlling the air pump motor electrically coupled to the air pump motor, the device for controlling the air pump motor supplying electrical power to the air pump motor;a device for controlling thespark plug electrically coupled to the spark plug, the device for controlling the spark plug supplying electrical power to the spark plug;a device for controlling the fuel injector electrically coupled to the fuel injector, the device for controlling the fuel injector supplying electrical power to the fuel injector;a communications interface for transmitting and receiving data communications of the control circuit; anda microprocessing unit for individually controlling the signal frequency and the duty cycle of the air pump motor, the spark plug, and the fuel injector, the microprocessing unit being electrically coupled to the communications unit, spark plug, and the air pump motor, and having memory, a bus line, and a software program stored in the memory for executing a method for controlling operation of the after-burner heated catalyst, the method comprising the steps of:determining the signal frequency and the duty cycle of the fuel injector and the air pump motor;determining a temperature of the after-burner heated catalyst and a fuel injector "on" time;pulse width modulating the fuel injector and the air pump motor if the temperature of the after-burner heated catalyst and the fuel injector "on" time are less than set limits stored in the memory of the microprocessing unit; anddisabling operation of the fuel injector if the temperature of the after-burner heated catalyst and the fuel injector "on" time are greater than set limits stored in the memory of the microprocessing unit.