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EP0280478A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Regenerative braking systems

Assignee: FKI CABLEFORM Ltd
•
Filing: 1988-02-19
•
Granted: —
•
Expires: 2008-02-19
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Abstract

Abstract An electric drive system of a battery electric vehicle comprises a d.c. series motor 4 which is supplied by a battery 1, and is connected to a vehicle drive wheel 8 via a gear box 7. An electronic switch 6 controls the supply of current to the motor 4, and is itself controlled by a control unit 3, which receives a brake demand signal from a pedal 2, and a current measurement signal from a current measurement device 5. A switch 9 controls motor and braking modes. Normally, the switch 9 is closed, but when it is opened, regenerative braking takes place. The control unit 3 regulates the retardation rate of the vehicle, by altering the mark/space ratio of the electronic switch 6, in order to maintain a constant retardation rate of the vehicle.

Inventors

  • 👤 John Morton
  • 👤 Alistair Morley Fox

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 22:16
CPC Classifications
B; B60; B60L; B60L15/00; B60L15/20; B60L15/2009; B60L7/00; B60L7/10; B60L7/12; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/72

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 106 words
A regenerative braking system comprising: a d.c. machine; an energy source for the d.c. machine, which source is capable of both supplying and absorbing energy; control means for controlling energisation of the d.c. machine in either a motoring or a regenerative braking mode; and monitoring means for monitoring a retardation rate actually achieved by the d.c. machine during regenerative braking: wherein the control means is operative, in regenerative braking mode, to respond to the output of the monitoring means and control energisation of the d.c. machine so as to maintain said retardation rate at a predetermined level or in accordance with a predetermined variation with time.
Claim 2
Dependent Claim 106 words
A regenerative braking system comprising: a d.c. machine; an energy source for the d.c. machine, which source is capable of both supplying and absorbing energy; control means for controlling energisation of the d.c. machine in either a motoring or a regenerative braking mode; and monitoring means for monitoring a retardation rate actually achieved by the d.c. machine during regenerative braking: wherein the control means is operative, in regenerative braking mode, to respond to the output of the monitoring means and control energisation of the d.c. machine so as to maintain said retardation rate at a predetermined level or in accordance with a predetermined variation with time.
Claim 3
Dependent Claim 55 words
A regenerative braking system according to Claim 1, wherein said control means comprises: an electronic switch for connecting the energy source to the d.c. machine; and a controller for the electronic switch, which controller is operative so to control the switch as to energise the machine in either a motoring or a regenerative braking mode.
Claim 4
Dependent Claim 85 words
A regenerative braking system according to Claim 2, wherein said monitoring means comprises a current measurement device connected to measure the current supplied to the d.c. machine and to supply to the controller a corresponding current measurement signal; and the controller is operative, in regenerative braking mode, to output to the electronic switch a series of control pulses, the mark/space ratio of which is so varied as to maintain the motor current at a predetermined level, or in accordance with a predetermined variation with time.
Claim 5
Dependent Claim 14 words
A regenerative braking system substantially as hereinbefore described with reference to the accompanying drawing.
Claim 6
Dependent Claim 14 words
A regenerative braking system substantially as hereinbefore described with reference to the accompanying drawing.
Claim 7
Dependent Claim 38 words
A battery electric vehicle having a regenerative braking system according to any of Claims 1 to 4, wherein said d.c. machine is a traction motor of the vehicle and said energy source is a battery of the vehicle.

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