METHOD FOR CONTROLLING AT LEAST ONE MEANS FOR RECUPERATING THE ENERGY GENERATED UNDER BRAKING OF A MOTOR VEHICLE

• US 20140214298A1
• Filed: 07/19/2012
• Published: 07/31/2014
• Est. Priority Date: 07/25/2011
• Status: Active Grant

• Current Assignee: Renault Sas (Renault)
• Original Assignee: Renault Sas (Renault)
• Inventors: Pita-Gil, Guillermo
• Granted Patent: US 9,156,444 B2
• Time in Patent Office: Days
• US Class Current: 701/70
• 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

The invention relates to a method for controlling a vehicle (1) equipped with a means (10) for recuperating the energy generated under braking, comprising steps of acquiring a braking instruction, calculating a first intermediate setpoint using a preventive filter which filters said braking instruction at the resonant frequency of the drive train (20) of the vehicle (1), calculating a second intermediate setpoint, formulated so as to damp out the oscillations in the drive train (20) using a curative filter, controlling said regenerative means (10) on the basis of said first and second intermediate setpoints, and controlling the brakes (60, 70). According to the invention, the second intermediate setpoint is calculated as a function of a forecast value of a dynamic characteristic of the recuperative means, estimated using a predictive mathematical model.

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 measured value of a dynamic characteristic of the recovery device,

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

d) calculating a second intermediate setpoint, created to damp oscillations of the torque transmission chain with a curative filter which filters the measured value of said dynamic characteristic,

e) controlling said recovery device according to a 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),

wherein, in the step d) a forecast value of said dynamic characteristic is estimated using a forecast mathematical model, and the second intermediate setpoint is calculated as a function also of said forecast value.

2. The control method as claimed in claim 1, wherein said 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, in step d), the second intermediate setpoint is calculated as a function of the difference between the measured value and the forecast value of said dynamic characteristic.

5. The control method as claimed in claim 4, in which said difference is filtered to reduce its high-frequency noise, before being filtered by the curative filter.

6. The control method as claimed in claim 5, wherein, in step c), the second intermediate setpoint is calculated to be equal to a sum of said filtered difference, and an expected value of the dynamic characteristic.

7. The control method as claimed in claim 6, in which wherein the expected value of the dynamic characteristic is calculated as a function of the control setpoint and of the braking setpoint.

8. The control method as claimed in claim 7, wherein said forecast value is calculated as a function of said expected value of the dynamic characteristic, taking into account a delay between the measurement performed in step b) and the control of said recovery device performed in step e).

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

10. The control method as claimed in claim 1, wherein, in step e), the control setpoint is calculated to be equal to the saturated value of the sum of the second intermediate setpoint, and the saturated value of the first intermediate setpoint.

11. 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, programmed to implement a control method as claimed in claim 1.