A vehicle is equipped with an internal combustion engine having a forced-induction apparatus with variable boost pressure, a first motor generator for generating electricity while applying negative torque to the engine, and a battery for storing the electricity generated by the first motor generator
A vehicle is equipped with an internal combustion engine having a forced-induction apparatus with variable boost pressure, a first motor generator for generating electricity while applying negative torque to the engine, and a battery for storing the electricity generated by the first motor generator. During the operation of the engine, a target boost pressure is set lower as the rotational speed of the first motor generator is increased. The engine is controlled such that, with the boost pressure adjusted to the target boost pressure, the output torque of the engine has a required value determined by the accelerator operation amount. Further, while the output torque of the engine is adjusted to the required value, the magnitude of the negative torque by the first motor generator acting on the engine is adjusted such that the engine rotational speed has a target value.
대표청구항▼
1. A control apparatus for a vehicle that includes an internal combustion engine with a forced-induction apparatus, an electric motor-generator that generates electricity while applying negative torque to the engine, and a battery in which electricity generated by the electric motor-generator is sto
1. A control apparatus for a vehicle that includes an internal combustion engine with a forced-induction apparatus, an electric motor-generator that generates electricity while applying negative torque to the engine, and a battery in which electricity generated by the electric motor-generator is stored, wherein the forced-induction apparatus includes a forced-induction device and a variable boost pressure mechanism that varies boost pressure caused by the forced-induction device,the control apparatus sets a required value of output torque of the engine in accordance with an accelerator operation amount,the control apparatus controls the variable boost pressure mechanism such that the boost pressure is adjusted to coincide with a target boost pressure that is set based on an operation state of the internal combustion engine,the control apparatus further comprises a controller,the higher rotation speed of the electric motor-generator, the lower the target boost pressure set by the controller becomes,in a state where the boost pressure is made to match with the target boost pressure, the controller controls the internal combustion engine such that output torque of the internal combustion engine becomes equal to the required value, which is determined by the accelerator operation amount. 2. The control apparatus for a vehicle according to claim 1, wherein the controller sets the target boost pressure such that the higher rotation speed of the electric motor-generator, the lower the boost pressure when the output torque of the internal combustion engine is adjusted to coincide with the required value is set. 3. The control apparatus for a vehicle according to claim 1, wherein the controller sets an upper limit value of the target boost pressure, which is set based on the engine operation state, such that the higher the rotation speed of the electric motor-generator, the lower the upper limit value becomes,the controller limits the target boost pressure by the upper limit value such that the higher the rotation speed of the electric motor-generator, the lower the target boost pressure becomes, andthe required value of the output torque of the internal combustion engine is set as a value under a situation in which the boost pressure is lower than or equal to the upper limit value of the target boost pressure. 4. The control apparatus for a vehicle according to claim 1, wherein, based on the engine operation state, the rotation speed of the electric motor-generator and voltage for operating the electric motor-generator, the controller sets the target boost pressure such that the higher the rotation speed of the electric motor-generator, the lower the target boost pressure becomes, and such that the lower the voltage, the lower the target boost pressure becomes. 5. The control apparatus for a vehicle according to claim 1, wherein the vehicle is provided with a differential device including a first rotation element, a second rotation element, and a third rotation element,power that is output from the internal combustion engine is transmitted to a drive shaft of the vehicle and the electric motor-generator through the differential device,the first rotation element is connected to the internal combustion engine,the second rotation element is connected to the electric motor-generator,the third rotation element is connected to the drive shaft, andthe controller adjusts the magnitude of the negative torque that is caused by the electric motor-generator and acts on the internal combustion engine, thereby controlling the engine speed to become a target value. 6. The control apparatus for a vehicle according to claim 5, wherein the differential device is provided with a planetary gear train including a planetary gear, which is the first rotation element, a sun gear, which is the second rotation element, and a ring gear, which is the third rotation element,the internal combustion engine is connected to the planetary gear such that rotation can be transmitted,the electric motor-generator is connected to the sun gear such that rotation can be transmitted, andthe drive shaft is connected to the ring gear such that rotation can be transmitted. 7. The control apparatus for a vehicle according to claim 1, wherein only when a failure occurs due to generation of electricity by the electric motor-generator, the controller sets the target boost pressure such that the higher the rotation speed of the electric motor-generator, the lower the target boost pressure becomes. 8. The control apparatus for a vehicle according to claim 1, wherein when the controller controls the internal combustion engine such that the output torque of the internal combustion engine becomes equal to the required value, which is determined by the accelerator operation amount, if the output torque of the internal combustion engine is less than the required value, the controller increases a throttle opening degree of the internal combustion engine to compensate for the shortage of the output torque,when the shortage cannot be compensated for by increasing the throttle opening degree, the controller reduces the negative torque, which is applied to the internal combustion engine by the electric motor-generator, to increase the engine speed, andwhen the engine speed becomes higher than or equal to a permissible upper limit value due to rise in the engine speed, the controller reduces the throttle opening degree of the internal combustion engine to restrain the rise in the engine speed. 9. The control apparatus for a vehicle according to claim 1, wherein the forced-induction device is a turbocharger that is driven by flow of exhaust gas of the internal combustion engine.
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이 특허에 인용된 특허 (3)
Marumoto, Masaharu; Nakamoto, Yoshihisa; Yamagata, Naoyuki; Fujii, Mikihito, Control for electrically driven supercharger.
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