Method and system for controlling the regenerative braking of an electric or hybrid motor vehicle

Patent metadata

Field	Value
Publication number	US-2016264144-A1
Application number	US-201415034315-A
Country	US
Kind code	A1
Filing date	Nov 5, 2014
Priority date	Nov 5, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

A method controls regenerative braking of a motor vehicle provided with an electric or hybrid powertrain. The method includes determining that a driver is pressing neither a throttle pedal nor a brake pedal of the vehicle. The method also includes determining a correction coefficient as a function of a torque supplied by a motor of the powertrain, of a speed and an angular velocity at a wheel of the vehicle, of a gradient, of a mass of the vehicle, and of friction. Next, the method includes determining a setpoint for regenerative braking without pressure on the brake pedal as a function of the correction coefficient and of two maps of torque as a function of a rotational speed of the powertrain, for a substantially zero gradient and a vehicle mass substantially equal to a reference mass of the vehicle.

First claim

1 - 6 . (canceled)

7 . A method for controlling regenerative braking of a motor vehicle provided with an electric or hybrid powertrain, comprising:
determining that a driver is pressing neither a throttle pedal nor a brake pedal of the vehicle; determining a correction coefficient as a function of a torque supplied by a motor of the powertrain, of a speed and an angular velocity at a wheel of the vehicle, of a gradient, of a mass of the vehicle, and of friction; and then determining a setpoint for regenerative braking without pressure on the brake pedal as a function of the correction coefficient and of two maps of torque as a function of a rotational speed of the powertrain, for a substantially zero gradient and a vehicle mass substantially equal to a reference mass of the vehicle.

8 . The method as claimed in claim 7 , further comprising:
modulating between the determining the correction coefficient and the determining the braking setpoint, during which the correction coefficient is modulated as a function of at least one value derived from running conditions and from characteristics of the vehicle, including the gradient, the mass of the vehicle, or the friction applied to the vehicle.

9 . The method as claimed in claim 7 , further comprising:
filtering the correlation coefficient.

10 . A system for controlling the regenerative braking of a motor vehicle equipped with an electric or hybrid powertrain, comprising:
means for determining a correction coefficient connected at an input to a set of sensors or means for estimating running conditions and characteristics of the vehicle and to means for determining that a throttle pedal and a brake pedal of the vehicle are not depressed; and means for determining a braking setpoint connected at ah input to the means for determining the correction coefficient and to memories comprising two maps of regenerative braking setpoints as a function of a rotational speed of the powertrain, for a substantially zero gradient and a vehicle mass substantially equal to a reference mass of the vehicle.

11 . The system as claimed in claim 10 , further comprising:
a modulator connected between the means for determining the correction coefficient and the means for determining the braking setpoint, so as to modulate the correction coefficient as a function of at least one value derived from the running conditions and from the characteristics of the vehicle, including a gradient, the mass of the vehicle, or friction applied to the vehicle.

12 . The system as claimed in claim 10 , further comprising:
a filter positioned at ab output of the means for determining the correction coefficient, so as to limit an amplitude of variations in the correction coefficient.

Assignees

• Renault Sa

Inventors

• Fontvieille Laurent
• Buis Emmanuel
• Verbeke Benoit

Classifications

• B60W2552/40

  Coefficient of friction · CPC title

• B60W2552/15

  Road slope, i.e. the inclination of a road segment in the longitudinal direction · CPC title

• B60W20/00

  Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} · CPC title

• B60W2530/10

  Weight · CPC title

• B60W30/18072

  Coasting · CPC title