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Control system for movable body

a control system and movable body technology, applied in mechanical equipment, clutches, transportation and packaging, etc., can solve the problems of increasing the size and weight of equipped components, increasing the disadvantage of movable bodies, and temporarily increasing motor torque, so as to increase the braking force and reduce the torque current , the effect of increasing the magnetic for

Active Publication Date: 2021-08-19
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent aims to provide a control system for a movable body that can reduce discomfort for passengers when using the motor. This is done by increasing the magnetic force of the motor's magnet. The technical effect is to improve the comfort of passengers on the movable body.

Problems solved by technology

However, in either case, the size and weight of equipped components increase, thereby being disadvantageous for the movable body.
However, when the magnetic force of the magnet is increased, the motor torque temporarily increases.
This increase in the motor torque may be transmitted to a person aboard the movable body, which gives him / her uncomfortableness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0036]FIG. 1 illustrates a four-wheel automobile 1 (one example of the movable body) controlled by a control system according to Embodiment 1. The automobile 1 is provided with an engine 2 and a drive motor 3 as drive sources. These drive sources of the automobile 1 cooperatively drive two wheels (here, rear wheels 4R) disposed symmetrically in the left-and-right direction, among four wheels 4F and 4R. Accordingly, the automobile 1 moves (travels).

[0037]The engine 2 of the automobile 1 is disposed on the front side of a vehicle body, and driving wheels are the rear wheels 4R on the rear side of the vehicle body. That is, the automobile 1 is what is called an “FR (front engine, rear-wheel drive) vehicle.” Moreover, the main drive source of the automobile 1 is the engine 2 rather than the motor 3, and the motor 3 is used to assist the driving of the engine 2 (what is called a “mild hybrid”). The motor 3 is used not only as the drive source, but also as a generator during regeneration....

embodiment 2

[0117]Below, Embodiment 2 is described in detail with reference to the drawings. Note that in the description below, detailed description of parts common with Embodiment 1 is omitted by giving the same reference characters.

[0118]Embodiment 2 is different from Embodiment 1 in that, during the magnetization control for increasing the magnetic force of the magnet 35 by the magnetization controlling module 21b, the change in the motor torque is absorbed by braking force of the brakes 14 but not the second clutch 7. In detail, the BCU 23 increases the braking force of the brakes 14 according to the increase in the motor torque.

[0119]FIG. 8 is a flowchart illustrating processing of the controller 100 during the magnetization control in Embodiment 2. Below, the control executed by the controller 100 is described with reference to FIG. 8.

[0120]First, at Step S201, the MCU 21 calculates the power-supplying period td of the magnetizing current. This power-supplying period td corresponds to th...

embodiment 3

[0137]Below, Embodiment 3 is described in detail with reference to the drawings. Note that in the following, detailed description of parts common with Embodiments 1 and 2 are omitted by giving the same reference characters.

[0138]Embodiment 3 is different from Embodiments 1 and 2 in that, during the magnetization control for increasing the magnetic force of the magnet 35 by the magnetization controlling module 21b, the change in the motor torque is absorbed by controlling the engine torque. In detail, the ECU 20 controls the alternator 15 so that the engine torque decreases according to the increase in the motor torque.

[0139]FIG. 10 is a flowchart illustrating processing of the controller 100 during the magnetization control. Below, the control executed by the controller 100 is described with reference to FIG. 10. Note that the “engine torque” as used herein refers to an amount of engine torque used for moving the automobile 1.

[0140]First, at Step S301, the MCU 21 calculates the powe...

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PUM

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Abstract

A control system for a movable body configured to move by utilizing a motor torque generated by a drive motor, is provided. The system includes the drive motor including a rotor configured to output a rotational force and provided with a variable-magnetic-force magnet, and a stator opposing the rotor with a gap therebetween and provided with a plurality of coils. The device includes a powertrain component provided so as to be associated with the drive motor, and a controller having a magnetization controlling module configured to control magnetizing current flowing through the coils so as to change a magnetic force of the magnet. During a magnetization control in which the magnetic force of the magnet is increased by the magnetization controlling module, the controller operates the powertrain component to suppress an increase in a moving force applied to the movable body due to an increase in the motor torque.

Description

TECHNICAL FIELD[0001]The technology disclosed herein relates to a control system for a movable body.BACKGROUND OF THE DISCLOSURE[0002]In recent years, movable bodies which move by utilizing motor torque generated by a motor, such as electric vehicles and hybrid vehicles, have become popular. For example, JP2014-231290A discloses a hybrid vehicle on which a motor (also used as a generator) and an engine are mounted. This hybrid vehicle is provided with a high-power battery as a power source of the motor, having a rated voltage at several hundreds of volts. The high-power battery is rechargeable by being coupled to a charging stand or a household power source.[0003]Moreover, JP2011-200545A discloses a motor applied to a laundry machine, including a magnet capable of increasing and decreasing its magnetic force. This motor increases the magnetic force of the magnet of a rotor as a demanded load increases.[0004]Meanwhile, the motor used for the movable body is demanded for a wide range ...

Claims

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Application Information

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IPC IPC(8): F16D48/06B60W20/40B60W20/20B60W10/02
CPCF16D48/064B60W20/40F16D2500/1022B60W10/024B60W2510/0275B60W20/20H02P21/0089Y02T10/72
Inventor ITASAKA, NAOKIEBISUMOTO, HIROFUMI
Owner MAZDA MOTOR CORP