Abstract:
PROBLEM TO BE SOLVED: To inform a driver of an operating state of a vehicle when the motor for running locks in a motor running mode.SOLUTION: When the motor is in a locked state, the carrier frequency fc that is the frequency to perform switching of the transistor of an inverter is reduced in an audible range if larger the accelerator position Acc (S130). As a result, the sound volume and the frequency of the electromagnetic sound corresponding to the accelerator position Acc are output from the inverter and the motor, and the operating state of the vehicle can be informed to the driver by the sound corresponding to the amount of depressing of the accelerator pedal. As a result, the driver can forecast to which extent he feels the dashing out feeling when the vehicle starts the movement, and can control the sense of incompatibility by an abrupt dashing out feeling.
Abstract:
PROBLEM TO BE SOLVED: To provide a vehicle that travels by outputting torque necessary for traveling while suppressing LC resonance.SOLUTION: The vehicle is configured in such a manner that when the rotational speed Nm2 of a motor MG2 is within a resonance region (a region from N1 to N2) where LC resonance occurs, a torque command Tm2* of the motor MG2 is corrected to be smaller by predetermined torque ΔT (S160); accompanied with the correction, torque command Tm1* of a motor MG1 is corrected to be smaller by the product of the predetermined torque ΔT and a gear ratio ρ, and target torque Te* of an engine 22 is corrected to be larger by the product of the predetermined torque ΔT and the sum of the gear ratio ρ and 1 (1+ρ) (S170, S180); and the engine 22, motors MG1, MG2, and a boost converter 55 are controlled by using the corrected target torque Te* and corrected torque commands Tm1*, Tm2*. Thereby, the vehicle can travel by outputting required torque Tr* to a drive shaft while suppressing the LC resonance.
Abstract:
PROBLEM TO BE SOLVED: To more appropriately set a shift operation line that avoids a noise and vibration region where noise and vibration caused by the operation of an engine may give an uncomfortable feeling to an occupant.SOLUTION: When an NV operation line Lnv[Rp] on a belonging power region to which request power Pe* belongs is not set (S130, S132), the shift operation line Lnv[Rp] is set to a tendency to separate from a fuel economy operation line with the increase of torque fluctuation ΔTe of the engine during the operation of the engine at an operation point based on the fuel economy operation line and request power Pe* (S160-S180).
Abstract:
PROBLEM TO BE SOLVED: To provide a power storage means controller that, when estimated SOC information is reset, brings estimated SOC close to true SOC in a shorter time. SOLUTION: The power storage means controller 100 includes: a charge/discharge estimating means 14 that estimates the state of charge of a chargeable/dischargeable battery 50; a memory means 16 that stores state-of-charge information from the charge/discharge estimating means 14; and a charge/discharge controlling means 18 that operates as follows depending on an event in the memory means 16 supplied with power from an accessory battery 46 as a detachable accessory power storage means: when the power supply is interrupted once and then restarted and state-of-charge information is reset, the controlling means controls charging/discharging of the battery 50 so that charging/discharging of the battery 50 is accelerated based on the state of charge estimated by the charge/discharge estimating means 14; and when it is determined that the state of charge estimated by the charge/discharge estimating means 14 has been approximated to the true state of charge, the controlling means changes charge/discharge control on the battery 50 so that the state of charge is kept in an intermediate range. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To control the heat generation of a motor and incompatibility to a driver. SOLUTION: In a vehicle, a torque reduction rate value RT1 is set with a tendency of becoming smaller as road surface gradient α and vehicle weight M get larger (S340), when an absolute value of vehicle speed V is a threshold Vref or less, a previous torque command (previous Tm*) of a motor is a threshold Tmref or more, and a temperature rise promotion time t is a threshold Tmref or more. A torque command Tm* is set by subtracting the torque reduction rate value RT1 from the previous torque command (previous Tm*) of the motor (S400). The motor is driven and controlled with the torque command Tm* set up. Thereby, the temperature rise of the motor and an inverter driving the motor can be controlled by backing up a vehicle at more appropriate speed. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a control device for a vehicular drive system that can suppress unwanted increase in the rotation speed of a second electric motor or a predetermined rotary element of a shifting portion for thereby improving durability of the second electric motor or shifting portion. SOLUTION: A control device for a vehicular drive system controls an engine rotation speed N E so as not to exceed an engine upper limit rotation speed N ELIM . The engine upper limit rotation speed N ELIM is changed depending on a second electric motor rotation speed N M2 such that a second electric motor maximum rotation speed N M2max , influenced by the engine upper limit rotation speed N ELIM , is changed depending on the second electric motor rotation speed N M2 . For example, when the second electric motor rotation speed N M2 is relatively high, the engine upper limit rotation speed N ELIM can be lowered, and the second electric motor maximum rotation speed N M2max can be changed to a lower level for suppressing an increase in rotation speed of a second electric motor M2. Thus, the second electric motor M2 is improved in durability thereof. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To make a rotation rate of a ring gear of a power dividing mechanism not excessively large. SOLUTION: An ECU executes a program including; a step to set a target drive force so that a ring gear rotation rate NR may become a negative value in an area not less than a threshold NR (3) (S130); and a step for controlling an engine connected with a carrier, a first MG connected with a sun gear and a second MG connected with the ring gear so that a drive force transmitted from automatic transmission to a rear wheel which is a driving wheel may become a target drive force (S140). When the target drive force is a negative value, a direction of the force working on the ring gear becomes the direction in which the ring gear rotation rate NR decreases. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To solve the problem that when a rotary electrical machine is used as a power source, whose load is increased according to the increase of requested acceleration, the output of the rotary electrical machine is limited for preventing heat generation or deterioration of the rotary electrical machine, so that the acceleration desired by the driver cannot be satisfied. SOLUTION: An ECU executes a program including the steps of: detecting the output torque of a second MG of a hybrid system (S100), detecting the temperature of the second MG (S110), calculating the SOC of a battery (S120), detecting the temperature of the battery (S130), and controlling an automatic transmission connected to the hybrid system (S150) to shift down if at least any one of the conditions that the second MG output torque is higher than a threshold A(1), the second MG temperature is higher than a threshold B(1), the battery SOC is lower than a threshold C(1) and the battery temperature is lower than a threshold D(1) is satisfied (YES in S140). COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To keep the number of revolutions of an input shaft of a transmission from changing abruptly when shifting a stepped transmission, thereby keeping a power storage device such as a secondary battery from being charged or discharged with excessive electric power. SOLUTION: When a transmission is shifted, a temporary number of revolutions Nm2tm, which is obtained by applying hysteresis to an expected number of revolutions of a motor Nm2est, i.e., the number of revolutions of a motor MG2 including computation delay or communication delay, is limited by means of a pre-shift number of revolutions Npre and a post-shift number of revolutions Naft, which are calculated using gear change ratios Gpre, Gaft before and after the gear shift, respectively, to set a control number of revolutions Nm2* (S300 to S360). Using the control number of revolutions Nm2*, an engine, the motors MG1, MG2, and the transmission are controlled. In this way, it is possible to keep the control number of revolutions Nm2* from changing abruptly when the gear change starts or ends. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve energy efficiency of a device by suppressing heat generation of a generator or a motor without complicating the structure of the device. SOLUTION: When request torque Td* requested for a driving shaft is below a threshold Tref, and the absolute value of the target number of revolutions Nm1* of a motor MG1 is below a threshold Nm1ref, and a difference between the target number of revolutions Ne* of an engine and the input number of revolutions Ne of the engine is below a threshold Neref (S150), the motor MG1 is put in a lock state, and the engine is controlled so that target torque Te* obtained by dividing the value which is obtained by multiplying the request torque Td* to be output to a driving shaft 36 by the number of revolutions Nd of the driving shaft by the number of revolutions Ne of the engine 22 can be output from the engine (S230 to 260). Consequently, it is possible to improve the fuel costs of a vehicle by suppressing the heat generation of the motor MG1 without providing any brake for locking the motor MG1. COPYRIGHT: (C)2008,JPO&INPIT