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US 11,629,659 B2Granted
Methods and system to shutdown an engine
AssigneeFord Global Technologies, LLC
InventorsAdam Banker, Jeffrey Doering, Chris Glugla
Life of this patent
Estimating the term…
Abstract
Systems and methods for operating an engine that is started via expansion stroke combustion are described. In one example, the method increases air flow through the engine during an engine stopping process so that a larger amount of air may be trapped in a cylinder that is on its expansion stroke so that greater amounts of engine torque may be provided during engine starting.
Claims16
A method for operating an engine, comprising:
- in response to an engine stop request, ceasing fuel injection to cylinders of the engine while the engine is rotating via a controller;
- holding a waste gate open while the fuel injection is ceased and the engine is rotating;
- contemporaneously, retarding intake valve closing time from base intake valve timing and advancing exhaust valve closing time from base exhaust valve timing while the engine is rotating at a speed above a threshold speed;
- and
- contemporaneously, advancing intake valve closing time and retarding exhaust valve closing time in response to engine rotational speed being less than the threshold speed and greater than zero.
2 more elements
A system, comprising:
- an engine;
- an electric compressor;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to cease injecting fuel to cylinders of the engine, activate the electric compressor, retard intake valve closing time of the engine from base intake valve timing and advance exhaust valve closing time of the engine from base exhaust valve timing while the engine is rotating in response to an engine stop request, and advance intake valve closing time and retard exhaust valve closing time in response to engine rotational speed being less than a threshold speed and greater than zero after ceasing injection of fuel to cylinders of the engine.
1 more element
A method for operating an engine, comprising:
- ceasing fuel injection to cylinders of the engine while the engine is rotating via a controller in response to an engine stop request;
- increasing a volumetric efficiency of the engine via retarding intake valve closing time of the engine from base intake valve closing timing and advancing exhaust valve closing time of the engine from base exhaust valve closing timing while the engine is rotating after ceasing fuel injection to the engine;
- and
- decreasing volumetric efficiency of the engine via advancing intake valve closing time and retarding exhaust valve closing time in response to engine rotational speed being less than a threshold speed and greater than zero as engine speed decreases after increasing the volumetric efficiency of the engine and ceasing fuel injection to the engine.
1 more element
Dependencies are inferred from the claim text.