Abstract:
PROBLEM TO BE SOLVED: To improve operation feeling when an accelerator pedal is turned off from an on state. SOLUTION: When the accelerator pedal is turned off from the on state and demand torque Tr* of a drive shaft is rapidly decreased, a down rate maximum valve ▵Tdrm1 is set so that the more a previous value of execution torque T* as torque output to the drive shaft at that time is large the more the maximum valve becomes large and the more traveling resistance RL at that time is small the more the maximum value becomes large (S210-S230). The execution torque T* is set by making rate processing to the demand torque Tr* by means of the down rate maximum value ▵Tdrm (S240-S260). A power source is controlled so that the set demand torque Tr* is output to the drive shaft. This allows making a time period from when the accelerator pedal is tuned off from the on state to when a vehicle starts decelerating substantially constant irrespective of torque output to the drive shaft and of the traveling resistance RL and the operation feeling can be improved. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To prevent a condition in which an engine cannot be started while receiving a reaction force of a drive shaft by a motor. SOLUTION: An automobile is provided with a mechanical pump driven by an engine 22 and an electric driven pump 92 as pumps for generating hydraulic pressure used for actuating a transmission gear 60 to transmit a power from a motor MG2 to a ring gear shaft 32a. When temperature of the electric driven pump 92 reaches a tolerance temperature, start of the engine 22 is banned. When the temperature is lower than the tolerance temperature, the engine 22 is stopped according to its temperature rise, and motor traveling by the motor MG2 is banned. Assist drive of the electric driven pump 92 at the time of changing the speed of the transmission gear 60 during operation of the engine 22 is banned. Therefore, a driving frequency of the electric driven pump 92 becomes small, the temperature can be avoided from reaching the tolerance temperature, and such a condition can be prevented that the power from the motor MG2 for receiving the reaction force of the drive shaft cannot be transmitted and the engine 22 cannot be started. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To prevent overspeed of a motor MG2, and to suppress overcharge to a battery. SOLUTION: The automobile comprises an engine, a motor MG1 and a driving shaft that are connected to a planetary gear, a motor MG2 connected to the driving shaft via a transmission, and a battery for exchanging electric power with the motors MG1 and MG2. When it is fixed to an Lo gear due to abnormality of the transmission, a request torque Tr* requested by a driver is limited by a request torque limit Trmax set small with increase in rotation speed Nm2 of motor MG2 (S140, S150), and the engine and motors MG1 and MG2 are controlled based on the limited demand torque (S160-S210). Thus, the overspeed of the motor MG2 can be prevented. Since the amount of power generation of the motor MG1 is suppressed with the limitation of the request torque Tr*, the overcharge to the battery can be suppressed comparing with the case of limiting only the torque outputted from the motor MG2. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To restrain generation of a shock and an abnormal sound caused when starting and stopping an internal combustion engine, in a vehicular driving device, a motive power output device having this device and its control method. SOLUTION: When a vehicle speed is not a value 0 when indicating starting of an engine 22 when a shift lever 81 shuts down inverters 41 and 42 in an NL range, the starting of the engine 22 is prohibited until the vehicle speed becomes the value 0. When the vehicle speed V is the value 0, shutdown of the inverter 41 on the motor MG1 side is released after locking rotation of a ring gear shaft 32a by setting two hydraulic brakes of a transmission 60 to ON, and the starting is performed by cranking the engine 22 by a motor MG1. Thus, since reaction can be shared when cranking the engine 22 by the motor MG1 without using a motor MG2, even when output of torque from the motor MG2 is restricted, a starting shock can be restrained. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To suppress drop in torque to a drive shaft and gear change shock, at the time of change-over of a speed stage of a transmission. SOLUTION: When change-over of the speed stage of the transmission 60 is required, an engine 22 and motors MG1, MG2 are controlled such that all required torque Tr* required to the drive shaft is covered by torque transmitted from the engine 22 to a ring gear shaft 32a via a power distribution integrated mechanism 30, along with power generation of the motor MG1 receiving engine torque reaction force within a range of an input limit Win of a battery 50, and then, the change-over of the speed stage is performed. Due to this, since the speed stage can be changed after torque required to be output from the motor MG2 to the drive shaft is set to be approximately 0, drop in the torque and gear change shock at the time of change-over of the speed stage can be suppressed. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To suppress shift shock and increase in energy loss in shifting a transmission. SOLUTION: When a shifting request of a transmission 60 is given while a braking force is being outputted from a motor MG2, an output of the motor MG2 is limited irrespective of a charging request of a battery 50, so that the driving torque is kept not to be transmitted to a driving axis from an engine 22. After a braking torque from the motor MG2 is replaced with brakes 89a, 89b, the transmission 60 is shifted and the braking torque by the brakes 89a, 89b is replaced with the braking torque from the motor MG2, so that the output limitation of the engine 22 is canceled. Thus, the shift shock can be suppressed by which the transmission 60 is shifted with the braking torque from the motor MG2 kept not to be outputted by the brakes 89a, 89b, and the increase in the energy loss can be restrained by which the power from the engine 22 is not wasted by the brakes 89a, 89b when replacing the braking torque of the motor MG 2 with the brakes 89a, 89b. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To expand an EV driving in a hybrid vehicle while considering a thermal load for electrical components.SOLUTION: An ECU comprises a drive mode control unit, a Wout control unit, and an engine start/stop determination unit. The drive mode control unit controls switching between drive modes, including a CD mode, which prioritizes driving using only a motor generator while shutting off an engine, and a CS mode, which maintains an SOC of a battery device at a prescribed target while operating the engine. The engine start/stop determination unit performs engine start determination on the basis of an allowable electrical discharge, which denotes electricity that the battery device can discharge. The Wout control unit changes the allowable electrical discharge on the basis of the drive mode and a state whether the engine is operating or stopped.
Abstract:
PROBLEM TO BE SOLVED: To suppress reduction in an electric mileage in an electric vehicle driven by motive energy from a plurality of motors.SOLUTION: An electric vehicle tends to have a second motor more efficient than a first motor. In the electric vehicle, only when MG1 request torque Tgrq* is larger than 0, the MG1 request torque Tgrq* is set to an MG1 torque instruction. The maximum torque Tmlmxi is set to an MG2 torque instruction. The first and second motors are controlled so as to be driven by the set MG1 torque instruction and MG2 torque instruction. Since the first motor is driven only when drive request torque Tprq exceeding the maximum torque Tmlmxi of the second motor is required, the drive of the first motor can be suppressed, and reduction in an electric mileage can be suppressed.