Engine starting system
First Claim
1. An engine starting system for restarting an engine having multiple cylinders by injecting fuel at least into one of the cylinders which is on an expansion stroke at engine stop and then igniting and combusting a mixture produced in said expansion stroke cylinder, said engine starting system comprising:
- an engine stopping section for stopping the engine by interrupting fuel supply to the individual cylinders while the engine is running;
a pre-stoppling engine state sensing section for detecting that the engine is in a state immediately before stopping wherein engine speed is lower than a specific value;
a restart conditions checking section for judging whether specific engine restart conditions have been satisfied; and
an engine restarting section for injecting the fuel into the cylinder which is on the expansion stroke and then igniting and combusting the mixture produced therein if the engine is in the state immediately before stopping when said restart conditions checking section has judged that the engine restart conditions have been satisfied in an engine stopping period which begins at a point of fuel supply interruption by said engine stopping section and ends at a point of complete engine stop.
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Accused Products
Abstract
When an engine restart request is given in an engine stopping period which begins at a point of fuel supply interruption and ends at a point of complete engine stop, an engine starting system judges whether TDC engine speed detected immediately before is equal to or lower than a specific value “A”, the counted number of reverse running motions of the engine is 0, and a piston in an expansion stroke cylinder is relatively close to TDC. If the judgment result is in the affirmative with all these conditions satisfied, the engine starting system injects fuel into the expansion stroke cylinder and then ignites and combusts a mixture produced therein. The engine starting system also injects the fuel into a compression stroke cylinder and then ignites and combusts a mixture produced therein when a piston in the compression stroke cylinder has gone beyond TDC.
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Citations
9 Claims
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1. An engine starting system for restarting an engine having multiple cylinders by injecting fuel at least into one of the cylinders which is on an expansion stroke at engine stop and then igniting and combusting a mixture produced in said expansion stroke cylinder, said engine starting system comprising:
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an engine stopping section for stopping the engine by interrupting fuel supply to the individual cylinders while the engine is running; a pre-stoppling engine state sensing section for detecting that the engine is in a state immediately before stopping wherein engine speed is lower than a specific value; a restart conditions checking section for judging whether specific engine restart conditions have been satisfied; and an engine restarting section for injecting the fuel into the cylinder which is on the expansion stroke and then igniting and combusting the mixture produced therein if the engine is in the state immediately before stopping when said restart conditions checking section has judged that the engine restart conditions have been satisfied in an engine stopping period which begins at a point of fuel supply interruption by said engine stopping section and ends at a point of complete engine stop. - View Dependent Claims (2, 3, 4)
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5. An engine starting system for restarting an engine having multiple cylinders by injecting fuel at least into one of the cylinders which is on an expansion stroke at engine stop and then igniting and combusting a mixture produced in said expansion stroke cylinder, said engine starting system comprising:
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a restart conditions checking section for judging whether specific engine restart conditions have been satisfied; an engine rotation direction sensing section for detecting the rotational direction of the engine when the rotational direction of the engine is reversed due to a compressive reaction force exerted by one of the cylinders which is on a compression stroke immediately before engine reversing and the engine subsequently approaches complete engine stop while repeatedly rotating in forward and reverse directions; an engine stopping section for stopping the engine by interrupting fuel supply to the individual cylinders while the engine is running; and an engine restarting section for restarting the engine when said restart conditions checking section has judged that the engine restart conditions have been satisfied, said engine restarting section including; an engine reversing section for giving a reversing torque to the engine by injecting the fuel into the cylinder which is on the compression stroke and then igniting and combusting a mixture produced therein when the engine restart conditions are-satisfied after said engine rotation direction sensing section has judged that the rotational direction of the engine has changed from the forward direction to the reverse direction; and an engine forward-rotating section for giving a forward-acting torque to the engine by injecting the fuel into the cylinder which is on the expansion stroke when the engine restart conditions have been satisfied and then igniting and combusting a mixture produced in said expansion stroke cylinder after said engine rotation direction sensing section has judged that the rotational direction of the engine has changed from the reverse direction to the forward direction. - View Dependent Claims (6, 7, 8, 9)
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Specification