Method for controlling at least one means for recuperating the energy generated under braking of a motor vehicle

• US 9,156,444 B2
• Filed: 07/19/2012
• Issued: 10/13/2015
• Est. Priority Date: 07/25/2011
• Status: Expired due to Fees

• Current Assignee: Renault Sas (Renault)
• Original Assignee: Renault Sas (Renault)
• Inventors: Pita-Gil, Guillermo
• Primary Examiner(s): Cheung, Calvin
• Assistant Examiner(s): SHUDY, ANGELINA M
• Application Number:
  US14/234,900
• Publication Number:
  US 20140214298A1
• Time in Patent Office: 1,181 Days
• Field of Search: 701/22, 701/70, 188/156, 303/3, 303/152, 903/903, 903/930
• US Class Current: 1/1
• CPC Class Codes: B60L 15/2018 for braking on a slope
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2260/50 by future state prediction
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 7/18 Controlling the braking effect B60L7/12, B60L7/14, B60L7/16 take precedence
• CPC Class Codes: B60L 7/26 Controlling the braking effect
• CPC Class Codes: B60T 1/10 by utilising wheel movement for accumulating energy, e.g. driving air compressors
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A method for controlling a motor vehicle equipped with wheels, brakes, a recovery device for recovering energy generated in braking, and a torque transmission chain from the wheels to the recovery device, includes acquiring a braking instruction, measuring a measured value of a dynamic characteristic of the recovery device, calculating a first intermediate setpoint with a preventive filter which filters the braking instruction so as to attenuate an amplitude of the braking instruction around a resonance frequency of the torque transmission chain, calculating a second intermediate setpoint to damp oscillations of the torque transmission chain, controlling the recovery device according to an electric motor control setpoint calculated as a function of the first and second intermediate setpoints, and controlling the brakes according to a braking setpoint calculated as a function of the braking instruction.

Claims

1. A method for controlling a motor vehicle equipped with wheels, brakes, a recovery device for recovering energy generated in braking, and a torque transmission chain from the wheels to the recovery device, said method comprising:

a) acquiring a braking instruction,

b) measuring a dynamic characteristic of the recovery device to determine a measured value,

c) calculating a first intermediate setpoint with a preventive filter which filters said braking instruction so as to attenuate an amplitude of the braking instruction around a resonance frequency of the torque transmission chain,

d) calculating a second intermediate setpoint to damp oscillations of the torque transmission chain, the calculating including estimating a forecast value of said dynamic characteristic, calculating a difference between the measured value and the forecast value of said dynamic characteristic, filtering the difference to reduce high-frequency noise to produce a filtered difference, calculating a sum of the filtered difference and the forecast value, and filtering the sum with a curative filter,

e) controlling said recovery device according to an electric motor control setpoint calculated as a function of said first and second intermediate setpoints, and

f) controlling the brakes according to a braking setpoint calculated as a function of the braking instruction acquired in step a).

2. The control method as claimed in claim 1, wherein said electric motor control setpoint, said first intermediate setpoint and said second intermediate setpoint are torque setpoints.

3. The control method as claimed in claim 1, wherein the recovery device includes an electric motor, and said dynamic characteristic includes a speed of the electric motor.

4. The control method as claimed in claim 1, wherein said forecast value is calculated as a function of an expected value of the dynamic characteristic calculated as a function of the electric motor control setpoint and of the braking setpoint, the forecast value taking into account a delay between the measuring performed in step b) and the controlling said recovery device performed in step e).

5. The control method as claimed in claim 1, wherein, in step e), the electric motor control setpoint is calculated as a function of a saturated value of the first intermediate setpoint.

6. The control method as claimed in claim 5, wherein, in step e), the electric motor control setpoint is calculated to be equal to a saturated value of a sum of the second intermediate setpoint, and the saturated value of the first intermediate setpoint.

7. A motor vehicle, comprising:

wheels,

brakes,

a recovery device for recovering energy generated in braking of the motor vehicle, and

a torque transmission chain from the wheels to the recovery device, and

a control unit for the recovery device and for the brakes, the control unit being configured to;

acquire a braking instruction,

measure a dynamic characteristic of the recovery device to determine a measured value,

calculate a first intermediate setpoint with a preventive filter which filters said braking instruction so as to attenuate an amplitude of the braking instruction around a resonance frequency of the torque transmission chain,

calculate a second intermediate setpoint to damp oscillations of the torque transmission chain, the calculating including estimating a forecast value of said dynamic characteristic, calculating a difference between the measured value and the forecast value of said dynamic characteristic, filtering the difference to reduce high-frequency noise to produce a filtered difference, calculating a sum of the filtered difference and the forecast value, and filtering the sum with a curative filter,

control said recovery device according to an electric motor control setpoint calculated as a function of said first and second intermediate setpoints, and

controlling the brakes according to a braking setpoint calculated as a function of the braking instruction.

8. A method for controlling a motor vehicle equipped with wheels, brakes, an electric motor to recover energy generated in braking, and a torque transmission chain from the wheels to the recovery device, said method comprising:

a) acquiring a braking instruction,

b) measuring a measured value of a dynamic characteristic of the electric motor,

c) calculating a first intermediate setpoint with a preventive filter which filters said braking instruction so as to attenuate an amplitude of the braking instruction around a resonance frequency of the torque transmission chain,

d) calculating a second intermediate setpoint to damp oscillations of the torque transmission chain, the calculating including estimating a forecast value of said dynamic characteristic, calculating a difference between the measured value and the forecast value of said dynamic characteristic, filtering the difference to reduce high-frequency noise to produce a filtered difference, calculating a sum of the filtered difference and the forecast value, and filtering the sum with a curative filter,

e) controlling said electric motor according to an electric motor control setpoint calculated as a function of said first and second intermediate setpoints, and

f) controlling the brakes according to a braking setpoint calculated as a function of the braking instruction acquired in step a).

9. The control method as claimed in claim 8, wherein said dynamic characteristic includes a speed of the electric motor.