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Method and apparatus for braking and stopping vehicles having an electric drive

a technology of electric drive and braking system, which is applied in the direction of braking system, instruments, analogue processes for specific applications, etc., can solve the problems of inadequacies, inability to adapt to electric drive configurations, and inability to optimize the dual braking strategy described above, so as to reduce the need for conventional friction brakes and avoid conventional friction brakes.

Inactive Publication Date: 2006-03-02
FORD MOTOR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a system for stopping and decelerating a vehicle without using friction brakes. The system uses an electric drive system and a speed control loop to achieve this. The system can provide a complete stop on grade inclines and can also be used as a back-up braking system for vehicles equipped with friction brakes. The system can reduce the need for conventional friction brakes and can be controlled using a torque command signal. The system can also include a closed loop speed control loop that uses a torque limit signal-pair for stopping the vehicle. Overall, the system provides a more efficient and effective braking system for electric vehicles.

Problems solved by technology

The dual braking strategy described above may not be optimum for certain types of electric drive configurations, and may not be appropriate for configurations where it is desirable to completely avoid friction braking components.

Method used

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  • Method and apparatus for braking and stopping vehicles having an electric drive
  • Method and apparatus for braking and stopping vehicles having an electric drive
  • Method and apparatus for braking and stopping vehicles having an electric drive

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Embodiment Construction

[0019] The invention relates to a method and apparatus for decelerating, braking and stopping a vehicle equipped with an electric drive system which includes an electric motor. A typical electric drive system 10 is shown in FIG. 1. An electric motor 12 mounted on the vehicle's chassis has an output drive shaft 14 which is connected through a differential gear-set 16 to a drive axle 18 carrying one or more traction wheels 20. Energy for powering the motor 12 is derived from an on-board storage battery 22 which provides DC power that is converted by an inverter 24 into AC power used to drive the motor 12. Although an AC motor 12 has been disclosed here, it should be noted that the present invention is suitable for use with a variety of DC and poly-phased AC motors. A vehicle control system 26 coordinates and controls the operation of the energy storage and drive components, and manages system functions such as charging, engine starting and stopping and regenerative braking. The vehicl...

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PUM

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Abstract

A method and apparatus are provided for braking and stopping a vehicle whose powertrain includes an electric drive. The electric drive is used to generate braking torque which is used to decelerate the vehicle down to a full stop. The braking torque is achieved using any of several closed loop speed control systems. The system can be used as a substitute for or as a supplement to conventional friction bakes.

Description

FIELD OF THE INVENTION [0001] This invention generally relates to vehicles with electric drive systems, and deals more particularly with a method and apparatus for braking and stopping the vehicle using the electric drive. BACKGROUND OF THE INVENTION [0002] Many recent designs of electric powered and hybrid electric powered vehicles employ a regenerative braking system in order to increase operating efficiency. During a braking event, the electric motor which normally drives one or more traction wheels is switched to operate as an electrical generator. Using the momentum and kinetic energy of the vehicle, the electric drive motor generates electricity that may be used to recharge on-board energy storage systems, such as batteries and ultra capacitors, power accessories, or power auxiliary on-board systems. [0003] Regenerative braking systems are particularly effective in recovering energy during city driving, where driving patterns of repeated acceleration and decelerations are comm...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06G7/76B60K6/20B60L7/18B60T13/58B60W10/08B60W30/18
CPCB60L7/18B60T13/586B60W10/08Y10S903/947B60W2540/10B60W2540/12B60W30/18127B60L7/14B60L15/2009Y02T10/64Y02T10/72
Inventor PRAKASH, RAJCROMBEZ, DALEWORREL, PETERGARG, VIJAY
Owner FORD MOTOR CO
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