Motor control system and control system for electric motor-driven vehicle

Patent metadata

Field	Value
Publication number	US-9825559-B2
Application number	US-201514870748-A
Country	US
Kind code	B2
Filing date	Sep 30, 2015
Priority date	Aug 29, 2012
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A motor control system includes a drive motor and a deck motor that are connected to a battery, an ECU, and a key switch. The key switch acquires that an operation unit has been turned on, and transmits a restart permission signal to the ECU. When SOC of the battery reaches or falls below a first threshold set in advance, the ECU performs a step of disabling all the motors, and when the restart permission signal is received, the ECU performs a step of executing a decelerated travelling mode where the disabled state of the drive motor is released and an allowed speed of the drive motor is reduced.

First claim

What is claimed is:

1. A control system for an electric motor-driven vehicle, the control system comprising:
a drive motor and an auxiliary motor that are connected to a power source unit;
a drive motor controller for controlling the drive motor;
an auxiliary motor controller for controlling the auxiliary motor; and
a main controller for outputting a control signal to each of the motor controllers,
wherein the drive motor controller determines, based on a driving state of the drive motor or an operation state of the drive motor controller itself, whether or not the drive motor is overloaded, and in a case where the drive motor is overloaded for a predetermined period of time set in advance or longer, outputs an overload determination signal to the main controller,
wherein the auxiliary motor controller determines, based on a driving state of the auxiliary motor or an operation state of the auxiliary motor controller itself, whether or not the auxiliary motor is overloaded, and in a case where the auxiliary motor is overloaded for a predetermined period of time set in advance or longer, outputs an overload determination signal to the main controller,
wherein the main controller performs an overload handling process set in advance in a case where the overload determination signal is input from at least one of the motor controllers, and
wherein the driving state of a corresponding one of the motors or the operation state of a corresponding one of the motor controllers itself is at least one of the following:
(1) a difference between a target number of revolutions and an actual number of revolutions of the corresponding motor,
(2) an integrated value of motor current input to the corresponding motor, and
(3) target torque or actual torque of the corresponding motor.

2. A control system for an electric motor-driven vehicle, the control system comprising:
a drive motor and an auxiliary motor that are connected to a power source unit;
a drive motor controller for controlling the drive motor;
an auxiliary motor controller for controlling the auxiliary motor; and
a main controller for outputting a control signal to each of the motor controllers,
wherein the drive motor controller determines, based on a driving state of the drive motor or an operation state of the drive motor controller itself, whether or not the drive motor is overloaded, and in a case where the drive motor is overloaded for a predetermined period of time set in advance or longer, outputs an overload determination signal to the main controller,
wherein the auxiliary motor controller determines, based on a driving state of the auxiliary motor or an operation state of the auxiliary motor controller itself, whether or not the auxiliary motor is overloaded, and in a case where the auxiliary motor is overloaded for a predetermined period of time set in advance or longer, outputs an overload determination signal to the main controller,
wherein the main controller performs an overload handling process set in advance in a case where the overload determination signal is input from at least one of the motor controllers,
wherein the main controller calculates or sets a target number of revolutions or target torque of at least one of the drive motor and the auxiliary motor according to a signal input from at least one operator sensor or an activation switch, and outputs a target signal that is a control signal indicating the target number of revolutions or the target torque which has been calculated or set to at least one of the drive motor controller and the auxiliary motor controller,
wherein the motor controller to which the target signal has been input controls the drive motor or the auxiliary motor according to the target number of revolutions or the target torque, and
wherein, as the overload handling process, the main controller selects the motor controller that is a processing target, and changes the target number of revolutions or the target torque which has been calculated or set, with respect to the motor controller which has been selected.

3. A control system for an electric motor-driven vehicle, the control system comprising:
a drive motor and an auxiliary motor that are connected to a power source unit;
a drive motor controller for controlling the drive motor;
an auxiliary motor controller for controlling the auxiliary motor; and
a main controller for outputting a control signal to each of the motor controllers,
wherein the drive motor controller determines, based on a driving state of the drive motor or an operation state of the drive motor controller itself, whether or not the drive motor is overloaded, and in a case where the drive motor is overloaded for a predetermined period of time set in advance or longer, outputs an overload determination signal to the main controller,
wherein the auxiliary motor controller determines, based on a driving state of the auxiliary motor or an operation state of the auxiliary motor controller itself, whether or not the auxiliary motor is overloaded, and in a case where the auxiliary motor is overloaded for a predetermined period of time set in advance or longer, outputs an overload determination signal to the main controller, and
wherein in a case where the overload determination signal is input into the main controller from at least one of the motor controllers and the auxiliary motor is overloaded, the main controller decelerates, as an overload handling process set in advance, the drive motor compared with a case of normal control.

4. A control system for an electric motor-driven vehicle, the control system comprising:
a drive motor and an auxiliary motor that are connected to a power source unit;
a drive motor controller for controlling the drive motor;
an auxiliary motor controller for controlling the auxiliary motor; and
a main controller for outputting a control signal to each of the motor controllers,
wherein the drive motor controller determines, based on a driving state of the drive motor or an operation state of the drive motor controller itself, whether or not the drive motor is overloaded, and in a case where the drive motor is overloaded for a predetermined period of time set in advance or longer, outputs an overload determination signal to the main controller,
wherein the auxiliary motor controller determines, based on a driving state of the auxiliary motor or an operation state of the auxiliary motor controller itself, whether or not the auxiliary motor is overloaded, and in a case where the auxiliary motor is overloaded for a predetermined period of time set in advance or longer, outputs an overload determination signal to the main controller, and
wherein in a case where the overload determination signal is input into the main controller from at least one of the motor controllers and the drive motor is overloaded, the main controller stops the auxiliary motor, as an overload handling process set in advance.

5. The control system for an electric motor-driven vehicle according to claim 4 ,
wherein the main controller performs
a step of decelerating the drive motor as compared with a case of normal control in a case where overloading of the drive motor continues for a predetermined period of time set in advance or longer after the auxiliary motor has been stopped, and
a step of stopping the drive motor in a case where overloading of the drive motor continues for a predetermined period of time set in advance or longer after the drive motor has been decelerated.

6. A control system for an electric motor-driven vehicle, the control system comprising:
a drive motor and an auxiliary motor that are connected to a power source unit;
a drive motor controller for controlling the drive motor;
an auxiliary motor controller for controlling the auxilia

Assignees

• Kanzaki Kokyukoki Mfg Co Ltd

Inventors

• Wang Hongkun
• Koga Kazunari
• Nakagawa Shigeaki
• Ishino Fumitoshi
• Cass William J

Classifications

• B60L11/1861

  Operations & Transport · mapped topic

• Y02T10/7044

  Cross-Sectional Technologies · mapped topic

• H02P29/60

  Controlling or determining the temperature of the motor or of the drive (H02P29/02 takes precedence) · CPC title

• H02P29/028

  the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault · CPC title

• B60L2200/40

  Working vehicles · CPC title