Abstract:
PROBLEM TO BE SOLVED: To lubricate a planetary gear mechanism more appropriately in a power output system, an automobile equipped therewith, a control device for the power output system, and a control method for the power output system. SOLUTION: In the automobile wherein an engine, a motor MG1 and a driveshaft are connected to the planetary gear mechanism and a motor MG2 is connected to the driveshaft via a transmission, if a hydraulic circuit 100 for actuating brakes B1 and B2 of the transmission fails and disables the supply of oil used in actuating the brakes B1 and B2 to the planetary gear mechanism 30 as a lubricant via an oil passage 116, the engine is continuously operated. Out of oil from a mechanical pump 102 having sufficient force feed performance in actuating the brakes B1 and B2 and oil from an electric pump 104 having minimum necessary force feed performance in actuating the brakes B1 and B2, oil not used in actuating the brakes B1 and B2 can be thus supplied to the planetary gear mechanism 30 via the oil passage 116 to lubricate the planetary gear mechanism 30. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To smoothly attain the gear change of a transmission even when the input/output of a capacitor device such as a secondary battery is limited. SOLUTION: The torque change of a motor is requested for smoothly switching the status of the gear of a transmission interposed between a motor and a driving shaft (S170), and when the torque change is not available in the range of the input/output limits Win, Wout of a battery (S200), a torque instruction Tm1* of another motor is reset so as to be within the input/output limitation of the battery (S210, S250), and a request power Pe* is also changed so that the revolution Ne of an engine can be set so as to be the target revolution Ne* (S230, S270). Thus, it is possible to smoothly switch the status of the gear of the transmission. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a hybrid car, capable of determining better a driver's rapid acceleration demand, as well as terminating better increase in a drive force associated with a driver's rapid acceleration demand, and to provide its control method. SOLUTION: The control method comprises a step of determining a driver's rapid acceleration demand (S130, S190) when an accel opening Acc is larger than a threshold A1, and an accel change ΔAcc is larger than a threshold A2, after a driver suddenly depresses the accel pedal by a large amount; a step of selecting a map for setting large torques (S220), where larger torques are set than a map for setting torques during normal operation, and a step of setting torque requirements Tr* (S230). The control method further comprises a step of determining the termination of a driver's rapid acceleration (S150, S160), when an accel opening Acc continues to be less than a cruising opening Acrs required for a cruising travel and a predetermined time has elapsed; a step of selecting a map for setting torques during normal operation as a default (S180); and a step of setting torque requirements Tr* (S230). COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To maintain an appropriate value of voltage of an inverter etc., even when the inverter driving a motor is shut down with a battery blocked. SOLUTION: Target engine speed Ne* is set (S100 to S130), such that voltage Vh generated on a power bus of the inverter becomes less than withstanding pressure of a capacitor as a protective circuit of the inverter by using electromotive force of the motor co-rotated by self-sustaining operation of an engine and becomes within a predetermined range Vα around target voltage Vh* as a voltage range capable of supplying power to a high-pressure auxiliary engine, when the inverter is shut down with the battery blocked. In addition, control is performed such that self-sustaining operation of the engine is realized at the target engine speed Ne*. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To prevent an automobile from entering a state of being incapable of traveling, by controlling overcharge of a battery in direct traveling mode where the automobile travels only with power being outputted from an engine directly to the drive shaft through a power distributing/integrating mechanism. SOLUTION: When abnormality occurs in a motor MG2 or an inverter 42 and direct traveling mode is set, engine speed of an engine 22 is held at a target speed Ne* as an accelerator pedal 83 is turned on, and driving of the engine 22 and a motor MG1 is controlled such that a driving force is outputted to a ring gear shaft 32a by outputting power generation torque from a motor MG1. Power generation of the motor MG1 is controlled to be consumed by auxiliary machines including the compressor 90 of an air conditioner in place of a motor MG2. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To output driving force from a generator to a drive shaft by stably operating an internal combustion engine at a target rotation speed and using reaction force on an engine side. SOLUTION: In an automobile wherein the internal combustion engine, the generator and the drive shaft are connected through a planetary gear mechanism and an electric motor is connected to the drive shaft, when the electric motor becomes a state impossible to drive, a basic throttle opening degree is set based on a differential between the target rotation speed and a present rotation speed of the engine by a relational expression in feedback control, a compensation opening degree for canceling a variation of torque acting on the engine side by a variation of negative torque from the generator is set based on torque acting on the engine side from the generator and on present and previous values of rotation speed of the engine and the target throttle opening degree is set by a sum of both the opening degrees. Quick response can be made to the negative torque variation of the generator at the time of outputting positive torque to the drive shaft by outputting the negative torque from the generator with use of the reaction force of the engine and the engine can be stably operated at the target rotation speed. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To suppress frequent start and stop of an internal combustion engine during a cold state in a power output device provided with the internal combustion engine capable of intermittently operate. SOLUTION: When power output from an engine is greater than set demand power due to high air density during cold state, engine speed is increased by a motor with throttle opening TH held to make power output from the engine agree with demand power (in embodiment, change from point A to point B). Consequently, battery charge by power larger than assumed power is suppressed and frequent stop and start of the engine caused by large fluctuation of battery remaining capacity (SOC) is suppressed. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To suppress the speed change shock at the time of switching the speed change stage of a transmission. SOLUTION: In an automobile where the first motor, to the sun gear of a planetary gear mechanism, an engine, to a carrier, and a drive shaft, to a ring gear, are attached respectively, and the second motor is attached via a transmission to the drive shaft, this device switches (S120-S170) the speed change stage after changing a motor operation mode into an engine/motor operation mode, if positive torque (driving force) is requested for the drive shaft when a request for speed change of the transmission is made amid the running in the motor operation mode. Since it can make the magnitude of the torque to be outputted from a motor MG2 smaller than that in the motor operation mode, by making the directly transmitted torque from the engine act upon the drive shaft in the engine/motor operation mode, it can suppress the speed change torque at switching of the speed change stage. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To further improve acceleration performance when accelerating a vehicle, by releasing only a brake pedal from a state of stepping both an accelerator pedal and the brake pedal. SOLUTION: When both the accelerator pedal 83 and the brake pedal 85 are stepped in stopping, engine request power to be outputted from an engine 22 is set by the sum of an absolute value of input restriction Win of a battery 50 and a Loss. Among operation points capable of outputting the preset engine request power, an operation point of an engine speed higher than an engine speed in an intersection between the engine request power and an operation line for fuel economy, is set as an operation point for taking preference of acceleration over the fuel economy, to control the engine 22. Since a travel resistance quantity by rotational inertial weight of the engine 22 can be reduced in acceleration when releasing the brake pedal 85 thereafter by holding the engine 22 in a high engine speed, the acceleration performance can be further improved. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To make the control simple even when there are a plurality of elements which should be prepared for starting up an internal combustion engine. SOLUTION: A delay time Tset in a normal state is set to a predetermined time Ts1 based on an engine coolant temperature Tw and a state of an air conditioner switch. The predetermined time Tsl is determined based on a time necessary for completing preheating of an engine 22 by a preheating device, preparations of sensors such as an air/fuel ratio sensor, and warming-up of an exhaust gas clean-up device (S100, S110). When it is determined that the vehicle can run using a motor based on a required torque Td*, a required power P* and the remaining capacity (SOC) of a battery (S120 to S150); the engine is started after the delay time Tset has elapsed. As a result, it is possible to efficiently perform start of the engine and operation immediately after the engine starts, and to make control at the time of starting the engine simple compared with the case where the engine is started after making determinations as to whether various preparations have been completed. COPYRIGHT: (C)2004,JPO