Idling controller of variable displacement engine
First Claim
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1. An idling controller for a variable displacement engine comprising:
- a plurality of cylinders of a multi-cylinder engine into each of which a fuel-air mixture is supplied through a common manifold and a common air intake passage,cylinder operation stopping means to stop the operation of part of said cylinders by cutting off the supply of the intake air to said part of cylinders,cylinder number controlling means to control the number of operating cylinders during idlying by supplying such control signals to said cylinder operation stopping means as switching the engine operation between an all-cylinder idling mode wherein all cylinders operate and a partial-cylinder idling mode wherein said part of cylinders operate while the other(s) remain inoperative,air flow-rate adjusting means which is provided in said common air intake passage in order to adjust the flow-rate of intake air passing through said common air intake passage, andair flow-rate controlling means to increase or decrease the quantity of the intake air according to the number of the cylinders in operation during idling by controlling said air flow-rate adjusting means so that the quantity of the intake air passing through said common air intake passage during said partial cylinder idling mode is less than that during all-cylinder idling mode, in conformity with the action of said cylinder number controlling means.
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Abstract
An idling controller for a variable displacement engine which is capable of operating either in a partial-cylinder or an all-cylinder mode by varying the number of cylinders in operation. When the engine runs at idle, the idling controller assures optimum operation for either cylinder operating mode by varying the quantity of air intake according to the number of cylinders in operation, providing an improvement in both fuel mileage and strating performance, one or the other of which has had to be sacrified conventionally.
28 Citations
10 Claims
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1. An idling controller for a variable displacement engine comprising:
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a plurality of cylinders of a multi-cylinder engine into each of which a fuel-air mixture is supplied through a common manifold and a common air intake passage, cylinder operation stopping means to stop the operation of part of said cylinders by cutting off the supply of the intake air to said part of cylinders, cylinder number controlling means to control the number of operating cylinders during idlying by supplying such control signals to said cylinder operation stopping means as switching the engine operation between an all-cylinder idling mode wherein all cylinders operate and a partial-cylinder idling mode wherein said part of cylinders operate while the other(s) remain inoperative, air flow-rate adjusting means which is provided in said common air intake passage in order to adjust the flow-rate of intake air passing through said common air intake passage, and air flow-rate controlling means to increase or decrease the quantity of the intake air according to the number of the cylinders in operation during idling by controlling said air flow-rate adjusting means so that the quantity of the intake air passing through said common air intake passage during said partial cylinder idling mode is less than that during all-cylinder idling mode, in conformity with the action of said cylinder number controlling means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Control system for a multi-cylinder variable displacement engine having a common air intake passage and a common fuel-air manifold for supplying a fuel-air mixture to all of the cylinders, each of said cylinders having an intake valve for admitting fuel-air mixture from said common manifold to the cylinder and an exhaust valve for exhausting combustion products from the cylinder to an exhaust system, said control system comprising:
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means for deactivating the intake valve of part of said cylinders so that fuel-air mixture is not drawn into said cylinder for part cylinder operation of the engine, means variable controlling the effective cross sectional area of said common air intake passage, and means jointly controlling said intake valve deactivating means and said air intake passage varying means to decreased the effective cross sectional area of said common air intake passage when the engine is operating in an idling mode and the intake valve of part of the cylinders is deactivated. - View Dependent Claims (9, 10)
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Specification