US 10,377,241 B2Granted

Speed control device of electromotive vehicle

AssigneePanasonic Intellectual Property Management Co., Ltd.

InventorsShuji Inoue, Shinji Masuda, Ryouji Oonishi, Hajime Homma

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Abstract

Includes electric motor (330) driving driving wheel (610) , speed control unit (300) controlling driving of electric motor (330) based on instructed speed ωr*, brake control unit (400) controlling hydraulic brake (500) applying mechanical braking to an electromotive vehicle, speed sensor (340) detecting traveling speed ωr of the electromotive vehicle, and determination unit (200) determining whether the mechanical braking needs to be applied in response to the difference between instructed speed ωr* and traveling speed ωr, and controlling operation of brake control unit (400) based on the determination result. Determination unit (200) determines that mechanical braking needs to be applied when instructed speed ωr* indicates deceleration and traveling speed ωr is higher than instructed speed ωr* , and performs control so that brake control unit (400) works hydraulic brake (500).

Claims9

Dependent claims

A speed control device for an electromotive vehicle, the electromotive vehicle including an electric motor that drives a driving wheel, a hydraulic brake that applies mechanical braking to the electromotive vehicle, and a regenerative brake that applies regenerative braking to the electromotive vehicle due to the electric motor, the speed control device comprising:

a speed sensor that detects a traveling speed of the electromotive vehicle;
and
at least one controller that:
receives an instructed speed based upon which the electric motor drives the driving wheel;
calculates a speed difference between the traveling speed detected by the speed sensor and the instructed speed;
determines whether only a braking force of the regenerative braking, due to the electric motor, is sufficient to make the speed difference zero;
and
controls at least one of the mechanical braking, due to the hydraulic brake, and the regenerative braking, due to the electric motor, based on a result of the determining,
wherein both the regenerative braking and the mechanical braking are applied so that the mechanical braking compensates for a deficit of the regenerative braking, when the braking force of the regenerative braking is not sufficient to make the speed difference zero.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/688,046Filed 28 Aug 2017 · continuation
Priority: JP 2015-24816121 Dec 2015
Published: US 2017/0355266 A114 Dec 2017
Granted: 13 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

B60L 7/14
Dynamic electric regenerative braking: for vehicles propelled by AC motors
B60L 7/26
With additional mechanical or electromagnetic braking: controlling the braking effect
B60L 15/2009
For control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed: for braking
B60L 15/2018
For braking: for braking on a slope