Control apparatus for idling stop of internal combustion engine and vehicle with the apparatus mounted thereon
First Claim
1. An idling stop control apparatus mounted on a vehicle, wherein auxiliary machinery is driven by means of either one of an internal combustion engine and an electric motor, and an output shaft of said internal combustion engine and an output shaft of said electric motor are linked with each other via a coupling mechanism that is coupled to connect said internal combustion engine with said electric motor and is released to disconnect said internal combustion engine from said electric motor, said coupling mechanism being released and said auxiliary machinery being driven by means of said electric motor via a transmission belt while said internal combustion engine is at a stop, said idling stop control apparatus comprising:
- a decision unit that determines whether a driving stop condition or a driving restart condition of said internal combustion engine is fulfilled;
a braking load specification unit that, when the driving restart condition of said internal combustion engine is fulfilled, specifies a braking load to be applied to said electric motor, in order to reduce electric motor velocity or number of revolutions of said electric motor according to a kinetic energy absorbing state of said transmission belt;
a drive stand-by unit that, when the driving restart condition of said internal combustion engine is fulfilled and said coupling mechanism is released, causes said output shaft of said internal combustion engine to be coupled with said output shaft of said electric motor via said coupling mechanism after application of the specified braking load to said electric motor; and
an internal combustion engine operation control unit that executes a series of processing to restart operation of said internal combustion engine after said internal combustion engine is coupled with said electric motor via said coupling mechanism.
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Accused Products
Abstract
The technique of the present invention reduces or even omits potential shocks and vibrations arising due to the coupling action of a coupling mechanism at the time of starting an internal combustion engine, and ensures a quick restart of the internal combustion engine. In a vehicle with an idling stop control apparatus of the present invention mounted thereon, a control unit inputs an inverted phase current Eon, which is determined according to the energy absorbing state of a transmission belt, into an auxiliary machinery driving electric motor, so as to brake rotations of the auxiliary machinery driving electric motor. After the input of the inverted phase current Eon into the auxiliary machinery driving electric motor, the control unit couples an electromagnetic clutch to link a crankshaft of the internal combustion engine with the auxiliary machinery driving electric motor. The value of the inverted phase current Eon is varied according to the energy absorbing state of the transmission belt. The braking force of the auxiliary machinery driving electric motor is thus varied according to the energy absorbing state of the transmission belt.
65 Citations
29 Claims
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1. An idling stop control apparatus mounted on a vehicle, wherein auxiliary machinery is driven by means of either one of an internal combustion engine and an electric motor, and an output shaft of said internal combustion engine and an output shaft of said electric motor are linked with each other via a coupling mechanism that is coupled to connect said internal combustion engine with said electric motor and is released to disconnect said internal combustion engine from said electric motor, said coupling mechanism being released and said auxiliary machinery being driven by means of said electric motor via a transmission belt while said internal combustion engine is at a stop, said idling stop control apparatus comprising:
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a decision unit that determines whether a driving stop condition or a driving restart condition of said internal combustion engine is fulfilled;
a braking load specification unit that, when the driving restart condition of said internal combustion engine is fulfilled, specifies a braking load to be applied to said electric motor, in order to reduce electric motor velocity or number of revolutions of said electric motor according to a kinetic energy absorbing state of said transmission belt;
a drive stand-by unit that, when the driving restart condition of said internal combustion engine is fulfilled and said coupling mechanism is released, causes said output shaft of said internal combustion engine to be coupled with said output shaft of said electric motor via said coupling mechanism after application of the specified braking load to said electric motor; and
an internal combustion engine operation control unit that executes a series of processing to restart operation of said internal combustion engine after said internal combustion engine is coupled with said electric motor via said coupling mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A vehicle having an idling stop function to selectively stop and restart driving an internal combustion engine according to a driving state of said vehicle, wherein auxiliary machinery is driven by means of an electric motor while said internal combustion engine is at a stop and by means of said internal combustion engine while said internal combustion engine is in active state, said vehicle comprising:
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a coupling mechanism that links an output shaft of said internal combustion engine with an output shaft of said electric motor, such as to be coupled to connect said internal combustion engine with said electric motor and to be released to disconnect said internal combustion engine from said electric motor;
a transmission belt that is laid through said output shaft of said internal combustion engine, an input shaft of said auxiliary machinery, and said output shaft of said electric motor;
a transmission belt state detection unit that detects a kinetic energy absorbing state of said transmission belt; and
an idling stop control unit that specifies a rate of decrease in electric motor velocity or number of revolutions of said electric motor based on the detected kinetic energy absorbing state of said transmission belt, and when a driving restart condition for restarting operation of said internal combustion engine is fulfilled, lowers the electric motor velocity by the specified rate of decrease, causes said output shaft of said internal combustion engine to be coupled with said output shaft of said electric motor via said coupling mechanism, and subsequently carries out a series of processing to restart driving said internal combustion engine. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A vehicle having an idling stop function to selectively stop and restart driving an internal combustion engine according to a driving state of said vehicle, wherein auxiliary machinery is driven by means of an electric motor via a transmission belt while said internal combustion engine is at a stop and by means of said internal combustion engine while said internal combustion engine is in active state, said vehicle comprising:
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a coupling mechanism that links an output shaft of said internal combustion engine with an output shaft of said electric motor, such as to be coupled to connect said internal combustion engine with said electric motor and to be released to disconnect said internal combustion engine from said electric motor;
a target braking velocity determination unit that determines a target braking velocity for braking said electric motor prior to a restart of driving of said internal combustion engine by taking into account temperature of said transmission belt; and
an idling stop control unit that, when a driving restart condition for restarting operation of said internal combustion engine is fulfilled, drives said electric motor at the target braking velocity, causes said output shaft of said internal combustion engine to be coupled with said output shaft of said electric motor via said coupling mechanism, and subsequently carries out a series of processing to restart driving said internal combustion engine. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method of controlling idling stop in a vehicle that has an idling stop function to selectively stop and restart driving an internal combustion engine according to a driving state of said vehicle, wherein auxiliary machinery is driven by means of an electric motor while said internal combustion engine is at a stop, said method comprising the steps of:
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detecting a kinetic energy absorbing state of a transmission belt that is laid through said internal combustion engine, said electric motor, and said auxiliary machinery;
determining whether or not a driving restart condition for restarting operation of said internal combustion engine is fulfilled;
when it is determined that the driving restart condition is fulfilled, specifying a rate of decrease in electric motor velocity or number of revolutions of said electric motor based on the detected kinetic energy absorbing state of said transmission belt; and
lowering the electric motor velocity by the specified rate of decrease and subsequently causing said output shaft of said internal combustion engine to be coupled with said output shaft of said electric motor via said coupling mechanism, so as to restart driving said internal combustion engine. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification