Internal combustion engine resonance start detection system and method and internal combustion engine controller

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(11)

EP 2 230 393 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	06.07.2011 Bulletin 2011/27

(43)	Date of publication A2:
	22.09.2010 Bulletin 2010/38

(21)	Application number: 10250502.1

(22)	Date of filing: 18.03.2010

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International Patent Classification (IPC):

F02D 41/14^(2006.01)
F02D 41/04^(2006.01)
F02D 41/02^(2006.01)

F02D 41/00^(2006.01)
F02D 41/12^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
	Designated Extension States:
	AL BA ME RS

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Priority:

19.03.2009 JP 2009068230

(71)	Applicant: Toyota Jidosha Kabushiki Kaisha
	Toyota-shi, Aichi-ken 471-8571 (JP)

(72)	Inventors:
	Ito, Yoshiyasu Toyota-shi, Aichi-ken 471-8571 (JP) Saigo, Yusuke Toyota-shi, Aichi-ken 471-8571 (JP) Negishi, Akiyoshi Toyota-shi, Aichi-ken 471-8571 (JP)

(74)	Representative: Smith, Samuel Leonard
	J.A. Kemp & Co. 14 South Square Gray's Inn London WC1R 5JJ London WC1R 5JJ (GB)

(54)	Internal combustion engine resonance start detection system and method and internal combustion engine controller

(57) A crankshaft rotation speed variation ω is compared with variation determination thresholds A1, A2, and A3 to suppress the magnitude of resonance of a dual mass flywheel (DMF). The variation determination thresholds A1 to A3 are set based on an operation state that reflects the intention of the vehicle's driver to accelerate or decelerate, which is, for example, a brake pedal depression operation (S102 to S108). Appropriate variation determination thresholds A1 to A3 are set regardless of whether the vehicle's driver is actually performing a braking operation or is not performing a braking operation. Thus, it is possible to appropriately detect the start of resonance of the DMF accurately based on the information on the intention of the vehicle's driver including whether or not a braking operation is being performed. Thus, it is possible to reduce or eliminate the variation of output generated by an engine, at an appropriate timing.

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