Vehicle with automatic engine stop/restart function and automatic engine stop/restart system and method for vehicle
First Claim
1. A vehicle with an automatic engine stop/restart function, comprising:
- an engine;
an automatic transmission having an oil pump driven in synchronism with the engine to supply an oil pressure to the automatic transmission;
an oil pressure controller to hold the oil pressure in the automatic transmission during an automatic stop of the engine; and
a control system configured to;
stop the engine automatically when an automatic engine stop condition is satisfied;
restart the engine automatically in a first mode when an automatic engine restart condition is satisfied;
determine whether the oil pressure in the automatic transmission becomes lower than a predetermined value during the automatic stop of the engine;
shift the automatic transmission into a neutral state when the oil pressure in the automatic transmission becomes lower than a predetermined value during the automatic stop of the engine;
restart the engine in a second mode after the automatic transmission is shifted to the neutral state; and
shift the automatic transmission into a drive state after the oil pressure in the automatic transmission is increased to the predetermined value by the oil pump driven in synchronism with the engine.
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Accused Products
Abstract
A vehicle with an automatic engine stop/restart function comprises an engine, an automatic transmission having an oil pump driven in synchronism with the engine to supply an oil pressure to the automatic transmission, an oil pressure controller to hold the oil pressure in the automatic transmission during an automatic stop of the engine, and a control system. The control system is configured to: determine whether the oil pressure in the automatic transmission becomes lower than a predetermined value during the engine automatic stop; shift the automatic transmission into a neutral state when the oil pressure in the automatic transmission becomes lower than a predetermined value during the engine automatic stop; restarts the engine; and then, shift the automatic transmission into a drive state after the oil pressure in the automatic transmission is increased to the predetermined value by the oil pump driven in synchronism with the engine.
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Citations
14 Claims
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1. A vehicle with an automatic engine stop/restart function, comprising:
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an engine;
an automatic transmission having an oil pump driven in synchronism with the engine to supply an oil pressure to the automatic transmission;
an oil pressure controller to hold the oil pressure in the automatic transmission during an automatic stop of the engine; and
a control system configured to;
stop the engine automatically when an automatic engine stop condition is satisfied;
restart the engine automatically in a first mode when an automatic engine restart condition is satisfied;
determine whether the oil pressure in the automatic transmission becomes lower than a predetermined value during the automatic stop of the engine;
shift the automatic transmission into a neutral state when the oil pressure in the automatic transmission becomes lower than a predetermined value during the automatic stop of the engine;
restart the engine in a second mode after the automatic transmission is shifted to the neutral state; and
shift the automatic transmission into a drive state after the oil pressure in the automatic transmission is increased to the predetermined value by the oil pump driven in synchronism with the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An automatic engine stop/restart system for a vehicle, the system comprising:
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means for stopping an engine automatically upon satisfaction of an automatic engine stop condition;
means for determining whether an oil pressure in an automatic transmission of the vehicle becomes lower than a predetermined value during an automatic stop of the engine;
means for restarting the engine automatically upon satisfaction of an automatic engine restart condition, when the oil pressure in the automatic transmission is higher than or equal to the predetermine value;
means for shifting the automatic transmission into a neutral state, when the oil pressure in the automatic transmission becomes lower than the predetermined value during the automatic stop of the engine;
means for restarting the engine automatically while the automatic transmission is in the neutral state; and
means for shifting the automatic transmission from the neutral state to a drive state after the oil pressure in the automatic transmission is increased to the predetermined value by an oil pump driven in synchronism with the engine.
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10. An automatic engine stop/restart method for a vehicle, the method comprising:
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determining whether an oil pressure in an automatic transmission of the vehicle becomes lower than a predetermined value while an engine of the vehicle is in an automatic stop state;
restarting the engine automatically from the automatic stop state upon satisfaction of an automatic engine restart condition, when the oil pressure in the automatic transmission is higher than or equal to the predetermined value;
shifting the automatic transmission into a neutral state, when the oil pressure in the automatic transmission is lower than the predetermined value;
restarting the engine automatically from the automatic stop state while the automatic transmission is in the neutral state; and
shifting the automatic transmission from the neutral state to a drive state, after the oil pressure in the automatic transmission is increased to the predetermined value by an oil pump driven in synchronism with the engine. - View Dependent Claims (11, 12, 13, 14)
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Specification