AIR/FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE FOR LIQUEFIED PETROLEUM GAS

Japanese Patent JP3818635

B2

PROBLEM TO BE SOLVED: To provide an air/fuel ratio control device for an internal combustion engine for liquefied petroleum gas, whereby a stable air/fuel ratio is obtained, without being affected by the temperature of an injector metering zone which changes due to various operation conditions.
SOLUTION: An evaporative cooling amount DTf from a delivery pipe to each injector metering zone is calculated based on a rotation speed Ne and a load referring to a map (step S106), and the temperature of the metering zone is estimated, by using the evaporative cooling amount DTf and the fuel temperature Tf of the delivery pipe (step S108). A fuel density correction coefficient KTinj is calculated, by using the above estimated value Tinj referring to the map (step S110), and a basic injection time TAU of each injector is corrected, based on the above correction coefficient KTinj (step S112). Thereby, even if the fuel density in each injector metering zone is changed with temperature, a fuel injection amount in the same injection time can be prevented from changing.

Takao Komoda
Toru Sato
Jun Yamada

JP2001221504A

September 06, 2006

July 23, 2001

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TOYOTA JIDOSHA KABUSHIKI KAISHA
Aisan Industry Co., Ltd.
Japan Auto Parts Research Institute, Inc.

F02D41/04; F02M21/02; F02D19/02; F02D41/02; F02D41/34; F02D45/00; (IPC1-7): F02D41/04; F02D19/02; F02D41/02; F02D41/34; F02D45/00; F02M21/02

JP2001164997A
JP2000087771A
JP2207166A

Hironobu Onda
Makoto Onda

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