Abstract:
PROBLEM TO BE SOLVED: To appropriately deal with simultaneous occurrence of a plurality of failures in a hydraulic circuit of a transmission connected to an output shaft of a motor and a driving shaft. SOLUTION: When a failure is caused in only one of a high-pressure forming system, a low-pressure forming system, a Lo-gear forming system and a Hi-gear forming system of the hydraulic circuit of the transmission, fail-safe control corresponding to this failure is executed (S150), and when two or more failures are simultaneously caused, the driving force of a motor MG2 is cut to prohibit transmission of torque from the motor MG2 to the driving shaft (S160), whereby occurrence of an unexpected situation is suppressed. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To properly change a speed change shift of a transmission, and to restrain excessive rotation of an electric motor in a system having the electric motor for outputting power to a drive shaft via the transmission. SOLUTION: When a request for Hi-Lo speed change is made (S230 and S240), speed change processing for changing speed change shifts of the transmission 60 (S260) is carried out after confirming that the request for Hi-Lo speed change continues for a designated period (S250). Thus, it is avoided that the shift of the transmission 60 is changed by executing the Hi-Lo speed change though an actual speed V is greater than a Hi-Lo speed change line Vlo. Therefore, excessive rotation of the electric motor MG2 caused by executing the Hi-Lo speed change of the transmission 60 though the actual speed V is greater is suppressed, and the speed change shift of the Hi-Lo speed change for the transmission 60 can be executed more suitably. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a hybrid vehicle, a driving device and a hybrid control method for suppressing shock in shift. SOLUTION: When a hybrid car is traveling in a coast-down state in which a driver turns off an accelerator, input restriction is set to tighten restriction in order to make a power to be input to a battery 50 smaller than that for normal driving, and an engine 22 or motors MG1 and MG2 are controlled so that a requested required torque can be output to a ring gear shaft 32a being a driving shaft within the range of the torque restriction of the motors MG1 and MG2 based on input restriction, and when the state of the gear of a transmission 60 is switched in the coast-down state, the input restriction of the battery 50 is returned to that for normal driving, and the state of the gear of the transmission 60 is switched, and the engine 22 or the motors MG1 and MG2 or the transmission 60 are controlled so that the required torque can be output to the ring gear shaft 32a within the range of the torque restriction of the motor MG2 for properly switching the state of the gear of the transmission 60, and within the range of the torque restriction of the motors MG1 and MG2 based on the input restriction. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To smoothly perform downshift by securing electric power required for synchronization of rotation speed of a second motor when the downshift of a transmission is required during motoring an engine with a first motor, in a vehicle where the first motor, the engine, and a driving shaft are connected to the sun gear of a planet gear, a carrier, and a ring gear, respectively, and the second motor is connected to the driving shaft via the transmission. SOLUTION: When the downshift is required during motoring the engine with the first motor, the engine is shifted from the motoring state to an autonomous operation state (S410) when consumable electric power Pm2* of the second motor obtained by subtracting power consumption Pm1 of the first motor and auxiliary machine electric power Pa from output limit Wout of a battery for exchanging electric power with two motors is less than a threshold α and electric power obtained by subtracting the auxiliary machine electric power Pa from the output limit Wout is the threshold α or more (S340 and S370). In this state, positive torque is outputted from the second motor, and the downshift is performed synchronously with the rotation speed (S440). COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To output a request driving force(request braking force) requested for traveling, and to suppress transmission shock in changing a speed. SOLUTION: When the speed change request of a transmission for shifting the output of a motor MG2 in a status that an accelerator is turned off, and for outputting it to a drive axle is made (S130), a torque to be output from a motor MG1 for suppressing the rotational frequency of an engine is limited by torque limitation Tlim so that a braking torque with lower limit limitation Tset or more can be output from the motor MG2 (S160, S170), and the torque to be output from the motor MG2 is limited by the lower limit limitation Tset (S190, S200). Thus, it is possible to output the target braking torque Tr* to the drive axle, and to suppress any torque to be generated in changing the speed of the transmission. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress shift shock when a shift stage is shifted when braking force is outputted to a driving shaft by an electric motor through a transmission and to suppress heat generation on a clutch and a brake required for shifting of the shift stage. SOLUTION: When requirement for shifting of the transmission 60 is performed when the braking force is outputted from a motor MG2, braking torque from the motor MG2 is replaced by brakes 89a, 89b of driving wheels 39a, 39b, thereby, it is made to the state that torque is not outputted from the motor MG2. Thereafter, the transmission 60 is shifted and after shifting, braking torque replaced by the brakes 89a, 89b is replaced by the braking torque from the motor MG2. Thereby, shock generated at shifting can be suppressed and heat generation of the clutch and the brake required for shifting can be suppressed. COPYRIGHT: (C)2006,JPO&NCIPI