[특허]Method and apparatus for controlling engine torque

Method and apparatus for controlling engine torque 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02D-041/00
출원번호	US-0270963 (1994-07-05)
발명자 / 주소	Cullen Michael J. (Northville MI) Christensen Louis R. (Canton MI) Grutter Peter J. (Plymouth MI) Weyburne Michael A. (Northville MI) Ulrey Joseph N. (Hiroshima MI JPX) Farmer David G. (Plymouth MI)
출원인 / 주소	Ford Motor Company (Dearborn MI 02)
인용정보	피인용 횟수 : 45 인용 특허 : 0

초록 ▼

A method for reducing the engine torque being produced by an internal combustion engine to a desired engine torque through coordinated control of spark retard, cylinder cut-out and air/fuel scheduling. The method is for use with a vehicle including a multi-cylinder internal combustion engine capable of generating torque, each cylinder having an associated fuel injector for providing fuel to the cylinder and an associated spark timing control for providing a spark for combustion of the fuel with fresh air during engine operation. The method includes identifying the desired engine torque to which the engine torque being produced is to be reduced, and determining a first torque reduction to be achieved by defueling at least one of the engine cylinders. The method also includes determining a second torque reduction to be achieved by lean air/fuel scheduling, the second torque reduction being adjusted for the number of cylinders defueled, and determining a third torque reduction to be achieved by spark retardation, the third torque reduction being adjusted for the number of cylinders defueled and for the lean air/fuel scheduling.

대표청구항 ▼

An apparatus for controlling torque output of a spark ignition internal combustion engine having multiple cylinders, an air and fuel mixture flow control and fuel injectors for each of said cylinders, a fuel cut-out control for said injectors and a spark timing control, a microprocessor programmed for establishing control signals to effect responses of said mixture control, said cut-out control and said spark timing control, said microprocessor having means for receiving operating condition sensor output information including mass air flow, engine speed, vehicle speed and throttle position, said microprocessor further having a control unit and memory registers, said memory registers storing control functions and being addressable by said control unit as said control unit operates on said sensor output information: wherein said microprocessor identifies a desired torque that is the lowest torque to which the engine torque is to be reduced; wherein said microprocessor determines a first torque reduction to be achieved by defueling at least one of said engine cylinders; wherein said microprocessor further determines a second torque reduction to be achieved by lean air/fuel scheduling, adjusted for the number of cylinders defueled; wherein said microprocessor further determines a third torque reduction to be achieved by spark timing retardation, adjusted for the number of cylinders defueled and for the lean air/fuel scheduling, and means for selectively implementing said first, second and third torque reductions so as to reduce the engine torque to said desired engine torque including means for selectively activating said controls for air and fuel mixture flow, said fuel cut-out and said spark timing in accordance with the establishment of predetermined values for said control signals.

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