(19)
(11) EP 0 445 848 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.12.1991 Bulletin 1991/51

(43) Date of publication A2:
11.09.1991 Bulletin 1991/37

(21) Application number: 91107702.2

(22) Date of filing: 01.03.1988
(51) International Patent Classification (IPC)5: F02D 11/10, F02D 41/14, F02D 9/04
(84) Designated Contracting States:
DE ES FR GB IT

(30) Priority: 02.03.1987 JP 45287/87

(62) Application number of the earlier application in accordance with Art. 76 EPC:
88301766.7 / 0281358

(71) Applicant: Yamaha Motor Co., Ltd.
Iwata-shi Shizuoka-ken (JP)

(72) Inventor:
  • Terui, Toshiyasu, c/o Yamaha Motor Co. Ltd.
    Iwata-shi, Shizuoka-ken (JP)

(74) Representative: Wombwell, Francis et al
Potts, Kerr & Co. 15, Hamilton Square
Birkenhead Merseyside L41 6BR
Birkenhead Merseyside L41 6BR (GB)


(56) References cited: : 
   
     
    Remarks:
    This application was filed on 13 - 05 - 1991 as a divisional application to the application mentioned under INID code 60.
     


    (54) Control system for controlling DC control motor which controls operation condition of internal combustion engine


    (57) A control system for controlling a DC control motor which controls an internal combustion engine to follow-up a target value varying continuously depending on the operation condition of the engine, the current flowing through the DC control motor being controlled through pulse width modulation. The control system comprises: means for detecting the operation condition of the engine; processor means for calculating and setting a target value depending on the operation condition of the engine; detector means for detecting the up-to-date value of the DC control motor; discriminator means for discriminating a difference between the target value and the up-to-date value to supply an output signal for changing the duty ratio of the current flowing through the DC control motor depending on the difference; a driver for energizing the DC control motor in response to the output signal from the discriminator means; and monitor means for controlling the changing rate of the up-to-date value and for increasing the duty ratio when the changing rate of the up-to-date value is less than a programmed rate.






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