Method for shutting down and switching on motor vehicle internal-combustion engine cylinders
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorsHeinz Lemberger, Josef Bauer
Life of this patent
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Abstract
A method shuts down and switches on cylinders in a motor vehicle internal-combustion engine. Injection valves are controlled by an engine timing system as a function of vehicle operating conditions. The shutting-down of cylinders is carried out sequentially according to a defined program. Vehicle brakes can be acted upon in a power-operated manner. In order to prevent a switching jolt when shut-down cylinders are switched on again, when the cylinders are switched on again, the running up of the engine takes place in steps according to another defined program and a braking intervention is carried out.
Claims16
A method of operating cylinders of a motor vehicle internal-combustion engine to avoid change-over jolts, the method comprising the acts of:
- sequentially shutting down the cylinders according to a defined program;
- and
- when switching-on the cylinders, further comprising the acts of:
- running-up the engine to switch on the cylinders according to another defined program;
- and
- performing a braking intervention of the vehicle to avoid the change-over jolt during the running-up act.
A software product, comprising:
- a computer readable medium having stored thereon program code segments that:
- sequentially shuts down the cylinders according to a defined program;
- and
- when switching-on the cylinders runs-up the engine to switch on the cylinders according to another defined program;
- and
- signals a braking intervention of the vehicle to avoid the change-over jolt during the running-up act.
Dependencies are inferred from the claim text.