(19)
(11) EP 0 978 642 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.12.2001 Bulletin 2001/49

(43) Date of publication A2:
09.02.2000 Bulletin 2000/06

(21) Application number: 99110641.0

(22) Date of filing: 02.06.1999
(51) International Patent Classification (IPC)7: F02D 41/06
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 04.08.1998 JP 22088598

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Aichi-ken 471-8571 (JP)

(72) Inventor:
  • Kizaki, Mikio
    Toyota-shi, Aichi-ken 471-8571 (JP)

(74) Representative: Pellmann, Hans-Bernd, Dipl.-Ing. et al
Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Bavariaring 4-6
80336 München
80336 München (DE)

   


(54) Control device of engine intake throttle valve


(57) The present invention offers a control device of an engine intake throttle valve (25) which optimizes a combustion condition of a combustion chamber (12) when an internal combustion engine (11) starts. The shorter an elapsed time after starting the engine, the higher a target throttle angle of the intake throttle valve (25) is. The target throttle angle changes to be lower in response to swift rising of the temperature of the combustion chamber (12), just after the engine (11) starts. Therefore the combustion condition of the combustion chamber (12) is optimized in the operation of starting the engine (11). Furthermore, the target throttle angle LSTRG is controlled according to the elapsed time after starting the engine (11), even though the coolant temperature changes slowly. Then, the combustion condition of the combustion chamber (12) is reliably optimized.






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