Diesel engine system and method of controlling diesel engine
First Claim
1. A method of controlling a diesel engine, comprising:
- stopping fueling said engine upon fulfillment of an engine stop condition while said engine is running;
positioning a piston of a first cylinder, which is in a compression stroke of a cylinder cycle when the engine completely stops, at a first stop position that is closer to the bottom dead center than to the top dead center; and
cranking said engine and starting fueling said engine by first injecting fuel into said first cylinder upon fulfillment of an engine restart condition while said engine is at rest.
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Accused Products
Abstract
In a process of automatically stopping a diesel engine upon fulfillment of automatic engine stop conditions, an ECU cuts off fuel injection when the engine speed equals a preset first engine speed N1. The ECU limits the amount of intake air at the first engine speed N1 and, then, increases the amount of intake air at a point in time when the engine speed equals a second engine speed N2, at which point a piston in a cylinder which will be on a compression stroke at engine stop is expected to transfer to a last intake stroke, so that the piston in the compression stroke cylinder at engine stop stops at a point within a specified range closer to the bottom dead center than a piston in a cylinder which will be on an expansion stroke at engine stop.
17 Citations
20 Claims
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1. A method of controlling a diesel engine, comprising:
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stopping fueling said engine upon fulfillment of an engine stop condition while said engine is running; positioning a piston of a first cylinder, which is in a compression stroke of a cylinder cycle when the engine completely stops, at a first stop position that is closer to the bottom dead center than to the top dead center; and cranking said engine and starting fueling said engine by first injecting fuel into said first cylinder upon fulfillment of an engine restart condition while said engine is at rest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling a diesel engine, comprising:
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stopping fueling said engine upon fulfillment of an engine stop condition while said engine is running; cranking said engine and starting fueling said engine by first injecting fuel into a first cylinder which is in a compression stroke of a cylinder cycle when said engine completely stops if a piston of the first cylinder is positioned at a first position closer to the bottom dead center than to the top dead center; and cranking said engine and starting fueling said engine by first injecting the fuel into a second cylinder which is in an intake stroke of a cylinder cycle when the engine completely stops if the piston of said first cylinder is positioned between the top dead center and the first stop position. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A diesel engine system comprising:
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a diesel engine having cylinders including a first cylinder, pistons, a crankshaft linked to said pistons for reciprocally moving said pistons in said cylinders, and fuel injectors capable of directly injecting fuel into said respective cylinders; a throttle valve arranged in an intake air passage of said diesel engine for throttling intake air into said cylinders; a starter motor capable of rotating said crankshaft; and a controller which controls; said fuel injectors to stop fueling said cylinders upon fulfillment of an engine stop condition; said throttle valve to close upon fulfillment of the engine stop condition and open when the engine speed reaches a predetermined speed so that the piston of said first cylinder, which is in a compression stroke of a cylinder cycle when the engine completely stops, stops at a first stop position that is closer to the bottom dead center than to the top dead center; and said starter motor to crank said engine and said fuel injectors to start fueling said engine by first injecting the fuel into said first cylinder upon fulfillment of an engine restart condition. - View Dependent Claims (19, 20)
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Specification