Abstract:
PROBLEM TO BE SOLVED: To stably operate an engine in no greater than an upper-limit revolution number in a vehicle, in which a first motor, the engine and the drive shaft are connected to a sun gear, a carrier and a ring gear, respectively, and a second motor is connected to the drive shaft, with the provision of a battery for exchanging electric power with the first and second motors. SOLUTION: A torque correction value α is set so as to tend to become smaller as the difference ΔNe of the revolution number between the upper limit revolution number Nemax of the engine and the engine revolution number Ne, based on the difference between the revolution number and a tolerable revolution number of the drive shaft, becomes smaller. Using the torque correction value α and a required torque Tr*, an execution torque T* is set (S110-S150), and the engine and the two motors are controlled so that the engine is operated in no greater than the upper limit revolution number Nemax (S160-S240). With this, when the difference ΔNe of the revolution number is small, an abrupt change in the revolution number of the drive shaft can be suppressed, and also an abrupt change in the upper limit revolution number Nemax can be suppressed. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress the loss of friction of an engine in the case of performing the motoring of the engine according to the stop of fuel supply. SOLUTION: When a request damping power Pv exceeds the input limit Win of a battery, the fuel supply of an engine is stopped (step S100 to S120, S140), and when a speed V of the vehicle is a relatively high speed, the target valve timing VT* of the engine 22 is set so as to be made later than normal valve timing VT only by ΔVT (step S150 to S170), and the air intake valve of the engine is opened and closed in the set target valve timing VT*, and two motors and the engine are controlled so that the monitoring of the engine can be performed (step S180 to step S230). Thus, it is possible to reduce the friction torque Vf of the engine, and to suppress the friction loss by setting the target valve timing VT* to be later than usual. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress the falling of torque in shifting a transmission by using the inertia torque of an internal combustion engine, and to restrain the internal combustion engine speed from being maintained high. SOLUTION: The operation points of an engine are set by using an operation line for fuel economy when a required power Pe* of the engine is less than a predetermined power Peref, and when the required power Pe* is more than the predetermined power Peref, the operation points of the engine are set, as preparation for switching the state of the gear of a transmission, by using an operation line for shift for operating the engine with higher rotation and lower torque than that of an operation line for fuel economy (S150), and the speed of the engine operating at the high rotation and low torque is decreased by torque from a motor MG1 when switching the state of the gear of the transmission (S240 to S260). When a vehicle speed V exceeds a predetermined speed V2 after the shift timing of the transmission, the operation points of the engine are set by switching the operation for shift to the operation line for fuel economy (S140, S160). COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress the deterioration in a capacitor device such as a secondary battery, and to quickly perform the speed change of a transmission in outputting a power from a motor through a transmission. SOLUTION: When the downshift of the shift level of a transmission 60 is operated (S220), the smaller one of a power calculated by subtracting output limitation Wout from the allowable maxim discharging power Wmax of a battery and a downshift required power Wchg as a power required for operating downshift is added to the output limitation Wout, and it is set as the output limitation Wout of a new battery 50 (S230 to S260), and the shift processing of the downshift of the transmission 60 is executed by using the set output limitation Wout (S270). Thus, it is possible to perform downshift with the maximum performance of the battery in such an extent that the deterioration in the battery is not urged. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To properly change the shift level of a transmission while correcting a power to be output from an internal combustion engine in a vehicle equipped with both an internal combustion engine which outputs a power to an axle side and a motor which outputs a power through the transmission to the axle side. SOLUTION: When changing the shift level of a transmission, the factor of the operation point of an engine to be performed before speed change is determined, and a correction rate Prt for determining change speed when changing the operation point of the engine according to the determined change factor or a delay time D as a standby time until the changed status is settled is set (S310 to S340), and the change of the operation point of the engine is operated by using the set correction rate Prt and the delay time D, and the change of the shift level of the transmission is operated. Thus, it is possible to more properly achieve speed change according to the change factor of the operation point of the engine. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To properly perform the continuous operation of an internal combustion engine when an intermittent operation is inhibited. SOLUTION: When the intermittent operation of an engine 22 is inhibited, and a speed from a speed sensor 88 is within a high vehicle speed region, a motoring mode is executed to operate the motoring of the engine 22 by a motor MG1 by cutting the fuel of the engine 22, and to output a torque matched with a request torque to a ring gear shaft 32a as a drive axle, and when the speed is within a low vehicle speed region, an independent operation mode is executed to operate the independent operation of the engine 22 by stopping the motor MG1, and to output a torque matched with the request torque to a ring gear shaft 32a. Thus, it is possible to improve energy efficiency by executing the motoring mode which is more efficient than the independent operation mode, and to prevent inconvenience due to the execution of the motoring mode in the low vehicle speed region, for example, the continuous discharging of a battery 50. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress feeling of incompatibility to be given to an operator when changing the shift level of a transmission 60 in an automobile 20 where an engine 22 and a motor MG1 and a drive shaft 32a are connected to planet gear mechanism 30, and a motor MG2 is connected through the transmission 60 to the drive shaft 32a. SOLUTION: When the torque command of a motor MG2 is near a value 0, and the shift request of the transmission 60 is not made, an engine 22 is controlled by using rotational frequency which is larger than the target rotational frequency of the engine 22 as practical rotational frequency, and when the torque command of the motor MG2 is near the value 0, and the shift request of the transmission 60 is made, the shift level is changed in such a status that the engine 22 is controlled by using the target rotational frequency of the engine 22 as the practical rotational frequency. Thus, it is possible to suppress any feeling of incompatibility from being given to an operator due to the unexpected change of the rotational frequency of the engine 22 when the shift level of the transmission 60 is changed. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a power output device capable of further adequately operating an engine. SOLUTION: In an automobile comprising an engine, a first motor, a driving shaft and a second motor each connected to a planetary gear mechanism, and a battery exchanging power with the first motor and the second motor, an estimated power Peest outputted from the engine is calculated, considering an inertia Ti of the system composed of the engine and the first motor (S120 and S130), an upper limit power Pemax is set based on the calculated estimated power Peest, a current power Pr currently outputted to the driving shaft and an input restriction Win of the battery (S140-S160), and a requested power P* is restricted by the upper limit power Pemax to set a target power Pe* to be output from the engine. According to this, the target power Pe* can be further adequately set, compared with the case not considering the inertia Ti, and the engine can be more adequately operated. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To properly determine the malfunction of the clutch of a transmission. SOLUTION: An automobile has a motor and the transmission for transmitting power from a motor to be output to a driving shaft with a change in the connected condition of the clutch. Herein, a rotating speed difference ΔN as an absolute value for a deviation between a rotating speed Nm2 of the motor and (Nr×Gr) that a rotating number Nr of the driving shaft is multiplied by a gear ratio Gr of the transmission is calculated (S110). When the calculated rotating speed difference ΔN is a threshold value Nref2 or more (S130), the rotating speed difference ΔN is integrated to calculate a time integration value In (S140), and when the calculated time integration value In gets to a threshold value Inref or more, the malfunction of the clutch of the transmission is determined (S160, S170). Thus, the malfunction of the clutch of the transmission is determined earlier even when the rotating speed Nm2 of the motor is not so increased. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To suppress an input of excessive power to a battery. SOLUTION: In an automobile, a drive shaft connected to an engine, a motor MG 1 and a vehicle shaft is connected to a planet gear mechanism, the drive shaft is connected to a motor MG 2 via a transmission, and a battery is prepared to exchange power with the motors MG 1 and MG 2. When upshifting is requested (S120), request power Pe* is corrected in a reducing direction (S130) and the engine and the motors MG 1, MG 2 are controlled by the use of the corrected request power Pe* (S160-S230). Consequently, torque directly transmitted from the engine to the drive shaft is reduced and torque outputted from the motor MG 2 is increased. Thus, the input of the excessive power to the battery is suppressed even if the torque outputted from the motor MG 2 is temporarily reduced in order to cancel inertia torque in upshifting. COPYRIGHT: (C)2006,JPO&NCIPI