Abstract:
PROBLEM TO BE SOLVED: To prevent the further deterioration of a transmission or a motor state attached to the transmission because a power output system is started while an abnormal condition generates in the transmission. SOLUTION: When starting of the power output system is instructed by operation of a power switch 92 and a brake switch 94, in case that an abnormal condition generated when the power output system started last time, the transmission 60 is temporary operated before starting the system to check operation, and the system is started after confirming a normal condition. When the abnormal condition of the transmission 60 is detected, the system is started by setting a fail safe mode that can travel a vehicle regardless of the abnormal condition. For example, when engagement of either one of brakes B1, B2 becomes impossible, the transmission 60 is drive controlled by using only the normal brake. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To surely prevent overspeed of a motor connected to a drive axis via a transmission even if switch to a requested speed change stage of a transmission is not normally performed. SOLUTION: In an automobile having an engine, a first motor and the drive axis connected to a carrier, a sun gear and a ring gear of a planetary gear mechanism respectively, having a second motor connected to the drive axis via a two stage transmission and provided with a battery exchanging electric power between the first and the second motor, speed change is started (S220) when speed change is requested, control is performed not to output torque from the second motor while continuing speed change to wait until completion of speed change (S290) if power generation power of the first motor is input control Win of the battery is input limit Win or less when the revolution number Nm2 of the second motor exceeds a predetermined revolution number N2ref during changing speed (S250), and switch to an original speed change stage irrespective of speed change request if the power generation power is larger then the input limit Win. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To restrain a shock when shifting a transmission while avoiding short-time stopping and restarting of an engine. SOLUTION: This automobile is provided with a battery for exchanging electric power with two motors, by connecting a second motor to a driving shaft via the transmission having two shifting stages, by connecting the engine, a first motor and the driving shaft to a carrier, a sun gear and a ring gear of a planetary gear mechanism. The automobile adjusts a target charge-discharge quantity Pch* of the battery so as to reduce torque to be shared by the second motor while securing request torque Tr* to the driving shaft when requesting shifting (S150), and controls the engine and the two motors in a state of prohibiting stopping of the engine even when engine request power Pe* set from the adjusted target charge-discharge quantity Pch* becomes a threshold value Pere or less, and releases prohibition of stopping of the engine when completing the shifting by performing the shifting thereafter. 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 compute a cruisable length more accurately.SOLUTION: In calculation of a cruisable length Lcd on the basis of a driving electricity cost Ed, an air-conditioning electricity cost Eac, and a state of charge SOC of a battery, the air-conditioning electricity cost Eac is calculated if time tac is equal to or longer than predetermined time tacref (S240 to S260); and the driving electricity cost Ed is calculated if time td is equal to or longer than predetermined time tdref shorter than the predetermined time tacref, a driving length Ld is equal to or larger than a predetermined length Ldref or a state-of-charge change amount ΔSOC is equal to or larger than a predetermined change amount ΔSOCref (S290 to S330).
Abstract:
PROBLEM TO BE SOLVED: To appropriately control a state of charge of a power storage device by reflecting the performance variation of an onboard power storage device so as not to damage operability of an electric vehicle and startability of an engine.SOLUTION: An SOC of a power storage device that is mounted on an electric vehicle which is selectively provided an EV mode to travel to positively use accumulated electric power of a power storage device and an HV mode to travel to maintain accumulated electric power of the power storage device is controlled so as not to come off from SOC control ranges 151 and 152. When the SOC estimated value reaches a control lower limit SOCl in the vehicle travel, charging of the power storage device by an onboard electric power generation mechanism is started. At low temperature and deterioration of the power storage device, when the performance degradation of the power storage device is concerned, the control lower limit SOCl in the HV mode rises more than normal time.
Abstract:
PROBLEM TO BE SOLVED: To provide an electric vehicle that notifies a driver in advance of decrease in outputtable driving force resulting from restriction of outputtable power from an energy storage device.SOLUTION: An electric vehicle 100 includes an energy storage device B, an electric motor 50, a restriction control section 104, a notifying section 80, and a changing section 108. The electric motor 50 generates cruise driving force using power outputted from the energy storage device B. The restriction control section 104 restricts outputtable power indicating power that can be outputted from the energy storage device B based on a load condition of the energy storage device B. The notifying section 80 gives notification of a warning when outputtable power is less than a threshold for notifying a driver of decrease in the cruise driving force. When the load condition of the energy storage device B is high, the changing section 108 increases the threshold to be greater than the threshold when the load condition of the energy storage device B is low.
Abstract:
PROBLEM TO BE SOLVED: To provide an electric vehicle that can notify a user of the limitation of regenerative braking force in appropriate timing in accordance with a degree of deceleration of the vehicle.SOLUTION: In an electric vehicle 100, an HV-ECU 50 feedback-controls a power balance between an electricity storage device B and an electric motor MG so that regenerative power generated by the electric motor MG when the vehicle decelerates may not exceed the upper limit value for charged electricity of the electricity storage device B, and a state value of the electricity storage device B may not exceed a predetermined allowable value. A notification unit 90 notifies a user of the vehicle of the limitation of regenerative braking force when the generation of the regenerative braking force by the electric motor MG is limited by the feedback control. The HV-ECU 50 determines whether or not the notification unit 90 should notify the user of the limitation of the regenerative braking force based on the result of comparison between the upper limit value for charged electricity and a determination value. When an amount of feedback control is equal to or above a threshold value, the HV-ECU 50 compares a value obtained by reflecting the amount of feedback control to the charged electric power upper limit value with the determination value.
Abstract:
PROBLEM TO BE SOLVED: To provide a vehicle estimating high-precision electrical driving range without giving sense of incongruity to a user.SOLUTION: In a hybrid vehicle capable of traveling by an EV mode and an HV mode, a remaining capacity of a battery 64 supplying electric power to a second motor generator MG2 is estimated, and an integrated value of the travel distances and an integrated value of consumption amounts of the remaining capacity when a vehicle performs electric traveling using only the second motor generator MG2 as a drive source are calculated. Only when the integrated value of the consumption amount of the remaining capacity is equal to or more than a threshold consumption amount, the vehicle, during external charging, calculates an electric cost and an electric cost learning value on the basis of "the integrated value of the travel distance and the integrated value of the consumption amount of the remaining capacity" calculated at that time point, and estimates an EV driving range using the electric cost or the electric cost learning value.
Abstract:
PROBLEM TO BE SOLVED: To suppress an engine from being started and stopped frequently.SOLUTION: An engine and two motors are controlled so that a vehicle is driven by driving power within the range of an output limit Wout while operating the engine until the driving power reaches or falls below a stopping threshold Pstop which is smaller than a starting threshold Pstart when the driving power reaches or exceeds the starting threshold Pstart which is equal to or less than the output limit Wout of a high voltage battery during the operation stop of the engine. The starting threshold Pstart and the stopping threshold Pstop are increased by slow change processing when the output limit Wout of the high voltage battery is increased during the operation of the engine (time t11-t12).