Torque down control apparatus for an engine
First Claim
1. A torque down control apparatus for an engine comprising:
- a plurality of cylinder groups, each of the cylinder groups including cylinders, injectors respectively disposed for supplying fuel to the cylinders, and an exhaust system having a catalyst;
a controller operating one or more the injectors so as to reduce a fuel supply amount into a corresponding cylinder, said controller switching an injector to be operated so that fuel cut in each of the cylinder groups chances with time and operating the injector so that fuel injection therefrom is stopped and the fuel supply to the cylinder is cut; and
a signal generating device for outputting a torque down requirement signal indicating a required torque down amount, said controller determining a number of cylinders in which a fuel cut is required on the basis of said torque down requirement signal and stopping fuel injection by operating the same number of injectors as the determined required number of cylinders, whereinsaid controller switches the injector to be operated, as the number of cylinders given to one cylinder group among the required number of cylinders is a predetermined number smaller than a total cylinder number included in said one cylinder group, so as to change a combination of cylinders in which the fuel cut is performed among said one cylinder group every time said predetermined number is given to said one cylinder group.
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Accused Products
Abstract
In a V type engine comprising a catalyst in each of banks, when a fuel cut requirement on the basis of a traction control is generated, cylinders in which the fuel is cut are controlled to be switched between right and left banks. For example, when a requirement for a fuel cut with respect to two cylinders, at first, after the fuel cut of two cylinders are performed in the right bank for a predetermined time, the fuel cut of two cylinder are performed in the left bank for a predetermined time and this operation is repeated during a continuing time of the fuel cut. Accordingly, a thermal damage due to the fuel cut can be prevented from concentrating only to one catalyst.
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Citations
9 Claims
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1. A torque down control apparatus for an engine comprising:
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a plurality of cylinder groups, each of the cylinder groups including cylinders, injectors respectively disposed for supplying fuel to the cylinders, and an exhaust system having a catalyst; a controller operating one or more the injectors so as to reduce a fuel supply amount into a corresponding cylinder, said controller switching an injector to be operated so that fuel cut in each of the cylinder groups chances with time and operating the injector so that fuel injection therefrom is stopped and the fuel supply to the cylinder is cut; and a signal generating device for outputting a torque down requirement signal indicating a required torque down amount, said controller determining a number of cylinders in which a fuel cut is required on the basis of said torque down requirement signal and stopping fuel injection by operating the same number of injectors as the determined required number of cylinders, wherein said controller switches the injector to be operated, as the number of cylinders given to one cylinder group among the required number of cylinders is a predetermined number smaller than a total cylinder number included in said one cylinder group, so as to change a combination of cylinders in which the fuel cut is performed among said one cylinder group every time said predetermined number is given to said one cylinder group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification