Internal Combustion Engine Stop Controller and Stop Control Method
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Accused Products
Abstract
When engine stop control is executed, an ECU estimates input power to a power storage device in accordance with an estimation of power generated by a generator and estimation of total power consumption of circuitry from the generator to the power storage device in the current state of operation. Further, the ECU compares the estimated input power with a tolerable input power to the storage device. When the generated power is excessive, the state of operation of the circuitry is changed such that the total power consumption by the circuitry increases, and then, torque output of the generator is permitted, to attain desired deceleration at the engine stop. Accordingly, in the engine stop control in which stopping force is generated by the power generating operation by the rotating electric machine, excessive charging caused by excessive power input to the power storage device can be prevented.
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Citations
46 Claims
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1-28. -28. (canceled)
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29. A stop controller for an internal combustion engine in a vehicle including the internal combustion engine operated on fuel combustion, a first rotating electric machine formed to generate stopping force for said internal combustion engine by a power generating operation when said internal combustion engine is stopped, a second rotating electric machine capable of generating vehicle driving force in parallel with said internal combustion engine, and a power exchange circuit for exchanging power between a power storage device and said first and second rotating electric machines, wherein
said power exchange circuit includes a converter provided between said power storage device and a DC power line, for exchanging DC power between said power storage device and said DC power line by a switching operation of a switching element such that the voltage on said DC power line matches a voltage command value, a first inverter formed to perform power-conversion between DC power on said DC power line and AC power input to/output from said first rotating electric machine, by switching operations of a plurality of switching elements, and a second inverter formed to perform power-conversion between DC power on said DC power line and AC power input to/output from said second rotating electric machine, by switching operations of a plurality of switching elements; -
said stop controller comprising; input limit setting means for setting tolerable input power of said power storage device; power generation estimating means for estimating power generation when said first rotating electric machine generates prescribed said stopping force while said internal combustion engine is stopped; input power estimating means for estimating total power consumption based on a sum of estimated power consumption by said power exchange circuit and said first and second rotating electric machines in the current operation state, when said internal combustion engine is stopped, and based on the estimated total power consumption and the power generation estimated by said power generation estimating means, for estimating input power to said power storage device; first stop control means for generating an output torque command for said first rotating electric machine such that said first rotating electric machine generates said prescribed stopping force in said current operation state, when the input power estimated by said input power estimating means is within said tolerable input power; loss control means for controlling an operation state of said power exchange circuit such that power consumption by said power exchange circuit increases, when the input power estimated by said input power estimating means exceeds said tolerable input power; input power predicting means for predicting input power to said power storage device when the power consumption by said power exchange circuit is increased to an upper limit by said loss control means, if the input power estimated by said input power estimating means exceeds said tolerable input power; power generation reducing means for modifying, when the input power estimated by said input power estimating means exceeds said tolerable input power and the input power predicted by said input power predicting means exceeds said tolerable input power, the output torque command for said first rotating electric machine from a value of said first stop control means, so that power generation by said first rotating electric machine is reduced; and second stop control means for generating said output torque command comparable to said first stop control means, together with control of said operation state by said loss control means, when the input power estimated by said input power estimating means exceeds said tolerable input power and the input power predicted by said input power predicting means is within said tolerable input power. - View Dependent Claims (30, 31, 32, 37, 38, 39, 40, 45)
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33. A stop control method for an internal combustion engine in a vehicle including the internal combustion engine operated on fuel combustion, a first rotating electric machine formed to generate force for stopping said internal combustion engine by a power generating operation when said internal combustion engine is stopped, a second rotating electric machine capable of generating vehicle driving force in parallel with said internal combustion engine, and a power exchange circuit for exchanging power between a power storage device and said first and second rotating electric machines, wherein
said power exchange circuit includes a converter provided between said power storage device and a DC power line, for exchanging DC power between said power storage device and said DC power line by a switching operation of a switching element, such that the voltage on said DC power line matches a voltage command value, a first inverter formed to perform power-conversion between DC power on said DC power line and AC power input to/output from said first rotating electric machine, by switching operations of a plurality of switching elements, and a second inverter formed to perform power-conversion between DC power on said DC power line and AC power input to/output from said second rotating electric machine, by switching operations of a plurality of switching elements; -
said stop control method comprising the steps of; setting tolerable input power of said power storage device; estimating power generation when said first rotating electric machine generates prescribed said stopping force while said internal combustion engine is stopped; estimating total power consumption based on a sum of estimated power consumption by said power exchange circuit and said first and second rotating electric machines in the current operation state, when said internal combustion engine is stopped, and based on the estimated total power consumption and the estimated power generation, for estimating input power to said power storage device; generating an output torque command for said first rotating electric machine such that said first rotating electric machine generates said prescribed stopping force in said current operation state, when the input power estimated at said step of estimating is within said tolerable input power; controlling an operation state of said power exchange circuit such that power consumption by said power exchange circuit increases, when the estimated input power exceeds said tolerable input power; predicting input power to said power storage device when the power consumption by said power exchange circuit is increased to an upper limit at said step of controlling, if the estimated input power exceeds said tolerable input power; modifying, when the input power estimated at said step of estimating exceeds said tolerable input power and the input power predicted at said step of predicting exceeds said tolerable input power, the output torque command for said first rotating electric machine from a value at said step of generating, so that power generation by said first rotating electric machine is reduced; and generating said output torque command comparable to that of said step of generating, together with control of said operation state at said step of controlling, when the input power estimated at said step of estimating exceeds said tolerable input power and the input power predicted at said step of predicting is within said tolerable input power. - View Dependent Claims (34, 35, 36, 41, 42, 43, 44, 46)
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Specification