Abstract: A system identification method executed by a system identification device that estimates a response of a system having a current flowing in a battery as input and an overvoltage of the battery as output, comprises: a first step of identifying the system by applying a model of the battery including a FIR model and an ARX model to the system, based on time series data of each of the current flowing in the battery and the overvoltage of the battery in a predetermined period; and a second step of estimating, based on the model of the battery, the overvoltage of the battery output from the system at an estimation target time after an input start time in the case where no current is input before the input start time and the current is input to the system from the input start time onwards.

Abstract: A control device for an electric compressor, capable of successfully controlling a drive motor of the compressor in response to the load fluctuation having complicated frequency components even when the motor is controlled in a sensorless manner, is provided.

Abstract: A driving force controller for an electric vehicle includes a feed-forward compensator for computing a second target driving force so as to suppress overshooting of an actual driving force that is actually outputted, with respect to a first target driving force requested by a driver, the feed-forward compensator includes a first transfer function expressing a characteristic that the actual driving force becomes a predetermined response with respect to the first target driving force; and an inverse of a second transfer function approximately expressing a transmission characteristic between a input target driving force and the actual driving force in a control system except the feed-forward compensator.

Abstract: An electric vehicle driving force control device capable of decreasing discrepancy generated between a driver's acceleration pedal operation and output torque actually generated by a drive motor is provided. The electric vehicle driving force control device includes target torque setting unit 5, 7, 8, 9, and 10 for setting target torque by limiting an upper limit of a target torque basic value from the target torque basic value and the maximum discharge power equivalent motor torque. The target torque setting unit corrects the target torque basic value such that, on a graph indicating a relationship between an acceleration opening and the target torque, an acceleration opening generating a limited target torque shifts to an acceleration opening side greater than the acceleration opening, and target torque smaller than the target torque basic value is generated in an accelerator opening region which is smaller than the limited accelerator opening.

Abstract: A driving force controller for an electric vehicle includes a feed-forward compensator for computing a second target driving force so as to suppress overshooting of an actual driving force that is actually outputted, with respect to a first target driving force requested by a driver, the feed-forward compensator includes a first transfer function expressing a characteristic that the actual driving force becomes a predetermined response with respect to the first target driving force; and an inverse of a second transfer function approximately expressing a transmission characteristic between a input target driving force and the actual driving force in a control system except the feed-forward compensator.

Abstract: The driving force controller for an electric vehicle that controls driving force of a motor in the drive system of an electric vehicle includes: a target driving force setting unit for setting the target driving force based on a request from a driver; a dividing unit for computing a first motor torque command value by dividing the target driving force by a reduction ratio; a target acceleration computing unit for computing target acceleration by dividing the target driving force by inertia of the drive system; an actual acceleration computing unit for computing actual acceleration by differentiating actual rotational speed of the motor; a correction amount computing unit for computing a correction amount for reducing deviation between the target acceleration and the actual acceleration; and a command value computing unit for computing a second motor torque command value by adding the correction amount to the first motor torque command value.

Abstract: The driving force controller for an electric vehicle that controls driving force of a motor in the drive system of an electric vehicle includes: a target driving force setting unit for setting the target driving force based on a request from a driver; a dividing unit for computing a first motor torque command value by dividing the target driving force by a reduction ratio; a target acceleration computing unit for computing target acceleration by dividing the target driving force by inertia of the drive system; an actual acceleration computing unit for computing actual acceleration by differentiating actual rotational speed of the motor; a correction amount computing unit for computing a correction amount for reducing deviation between the target acceleration and the actual acceleration; and a command value computing unit for computing a second motor torque command value by adding the correction amount to the first motor torque command value.

Abstract: An electric motor control device is capable of reducing vibration in a speed fluctuation range at a high frequency. The electric motor control device includes a target rotation speed setting unit that sets the target rotation speed of an electric motor, a rotation speed estimation unit that calculates an estimated rotation speed of the electric motor, and a drive command signal generation unit that generates a drive command signal for the electric motor so as to eliminate a rotation speed difference between the target rotation speed and the estimated rotation speed. The rotation speed estimation unit includes an error calculation unit that calculates an error related to rotation of the electric motor and an estimated corrected rotation speed calculation unit that calculates an estimated corrected rotation speed by taking the error as input and correcting the estimated rotation speed.

Abstract: An electric vehicle driving force control device capable of decreasing discrepancy generated between a driver's acceleration pedal operation and output torque actually generated by a drive motor is provided. The electric vehicle driving force control device includes target torque setting unit 5, 7, 8, 9, and 10 for setting target torque by limiting an upper limit of a target torque basic value from the target torque basic value and the maximum discharge power equivalent motor torque. The target torque setting unit corrects the target torque basic value such that, on a graph indicating a relationship between an acceleration opening and the target torque, an acceleration opening generating a limited target torque shifts to an acceleration opening side greater than the acceleration opening, and target torque smaller than the target torque basic value is generated in an accelerator opening region which is smaller than the limited accelerator opening.

Abstract: A parameter estimation device includes an input signal detecting means 3 that detects an input signal inputted to an object system 1 expressed by an equivalent circuit model 5A containing at least an integrator element COCV, an output signal detecting means 2 that detects an output signal outputted from the object system, an output differentiating means 4 that differentiates the output signal to obtain and output an output differential signal, a modified equivalent circuit model 5B where respective elements of the equivalent circuit model 5A are changed to non-integrator elements in such a way that the output when the input signal is inputted becomes an output differential signal, and an element parameter estimating means 5 that estimates the parameters corresponding to the respective elements based on the modified equivalent circuit model by using the signals.

Abstract: A control device for an electric compressor, capable of successfully controlling a drive motor of the compressor in response to the load fluctuation having complicated frequency components even when the motor is controlled in a sensorless manner, is provided.

Abstract: An electric motor control device is capable of reducing vibration in a speed fluctuation range at a high frequency. The electric motor control device includes a target rotation speed setting unit that sets the target rotation speed of an electric motor, a rotation speed estimation unit that calculates an estimated rotation speed of the electric motor, and a drive command signal generation unit that generates a drive command signal for the electric motor so as to eliminate a rotation speed difference between the target rotation speed and the estimated rotation speed. The rotation speed estimation unit includes an error calculation unit that calculates an error related to rotation of the electric motor and an estimated corrected rotation speed calculation unit that calculates an estimated corrected rotation speed by taking the error as input and correcting the estimated rotation speed.

Abstract: A parameter estimation device includes an input signal detecting means 3 that detects an input signal inputted to an object system 1 expressed by an equivalent circuit model 5A containing at least an integrator element COCV, an output signal detecting means 2 that detects an output signal outputted from the object system, an output differentiating means 4 that differentiates the output signal to obtain and output an output differential signal, a modified equivalent circuit model 5B where respective elements of the equivalent circuit model 5A are changed to non-integrator elements in such a way that the output when the input signal is inputted becomes an output differential signal, and an element parameter estimating means 5 that estimates the parameters corresponding to the respective elements based on the modified equivalent circuit model by using the signals.

Abstract: A control unit 3 of a select assist device includes a start halt judging part 31 for judging a start halt by comparing a relative displacement amount and a start threshold value, a target relative displacement amount part 32 for setting a target relative displacement amount so that it is set to be a predetermined value when an assist actuator starts and then it is gradually decreased toward zero, and a drive command value computing part 33 for computing a drive command value so that approximate the relative displacement amount to the target relative displacement amount.

Abstract: An operating position select device has a select lever unit, a mode shift unit to shift operation modes of the automatic transmission, and an assist actuator controlled by a control unit. A first connecting member of the select lever and a second connecting member of the mode shift unit are relatively movable to a limit amount to each other and integrally movable beyond the limit amount with each other. The positions of the members are detected by an operating position sensor and an assist position sensor, respectively. The actuator is driven so that a difference between an operating position and an assist position may be reduced, but prohibited from driving when the difference is kept out of a permissible range for a predetermined period during rest of the actuator.

Abstract: An operating position select device has a select lever unit, a mode shift unit to shift operation modes of the automatic transmission, a mechanically connecting means connecting them, and an assist actuator to apply assist force to a select lever of the select lever unit. A control unit for controlling the actuator is electrically connected to an operating state sensor detecting an operating state of the select lever. The control unit executes assist control to control the assist actuator based on the operating state signal of the operating state sensor, and maintains the assist control for a predetermined period after the ignition switch is turned to OFF.

Abstract: An operating position select device has a first connecting member connected with a select lever, a mode shift unit for shifting operation modes of an automatic transmission, a second connecting member connected with the mode shift unit, the second connecting member having a relative movable mechanism for allowing a limited movement relative to the first connecting member and an assist actuator, a position sensing means sensing at least two of an operating position, an actuation position and their relative position, and a control unit for controlling the actuator based on the relative position. The control unit has an assist force suppressing means for suppressing the assist force when an assist control where the assist actuator is started based on a relative position variation due to a variation of the actuation position.

Abstract: An intake-air control system for an engine enabling an intake-air quantity and a compression ratio to be variably controlled, includes sensors detecting engine operating conditions and the compression ratio, and a control unit electronically connected to the sensors for feedback-controlling the intake-air quantity based on the compression ratio as well as the engine operating conditions, while feedback-controlling the compression ratio based on the engine operating conditions. The control unit executes phase-matching between an intake-air quantity change occurring based on intake-air quantity control and a compression ratio change occurring based on compression ratio control, considering a relatively slower response in the compression ratio change than a response in the intake-air quantity change.

Abstract: An operating position select device has a select lever unit, a mode shift unit to shift operation modes of the automatic transmission, and an assist actuator controlled by a control unit. A first connecting member of a select lever and a second connecting member of the mode shift unit are relatively movable to a limit amount to each other and integrally movable beyond the limit amount with each other. The actuator is controlled to decrease a relative displacement of the members. When the turn-on of an ignition key is detected, a start-up threshold value is used for judging the assist control and set larger than a normal value for a predetermined period to prevent miss-assist control when a driver touches the lever.

Abstract: An operating position select device has a select lever unit, a mode shift unit to shift operation modes of the automatic transmission, and an assist actuator controlled by a control unit. A first connecting member of the select lever and a second connecting member of the mode shift unit are relatively movable to a limit amount to each other and integrally movable beyond the limit amount with each other. The positions of the members are detected by an operating position sensor and an assist position sensor, respectively. The actuator is driven so that a difference between an operating position and an assist position may be reduced, but prohibited from driving when the difference is kept out of a permissible range for a predetermined period during rest of the actuator.