METHOD FOR RECOVERING ELECTRICAL ENERGY IN A VEHICLE WITH REGENERATIVE BRAKING

• US 20100234170A1
• Filed: 06/04/2007
• Published: 09/16/2010
• Est. Priority Date: 06/27/2006
• Status: Active Grant

• Current Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Original Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Inventors: Masfaraud, Julien, Doffin, Hugues
• Granted Patent: US 8,092,338 B2
• Time in Patent Office: Days
• US Class Current: 477/4
• CPC Class Codes: B60L 7/16 for vehicles comprising converters between the power source and the motor
• CPC Class Codes: H02J 7/1446 in response to parameters of a vehicle
• CPC Class Codes: H02J 7/1492 by means of controlling devices between the generator output and the battery
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

Method for recovering electrical energy in a vehicle with regenerative braking is used in a vehicle equipped for this purpose with an electrical capacitance device to store electrical energy supplied by a rotary electrical machine of the vehicle during regenerative braking operation. A choice is made, on the basis of the initial rotational speed of the rotary electrical machine to apply an energy recovery stratagem from at least the following two: —a first energy recovery strategy that favors high power supplied by the rotary electrical machine; and—a second energy recovery strategy that favors high efficiency of the rotary electrical machine.

Claims

1. Process for the regeneration of electrical energy in a motor vehicle having a regenerative braking system, the said vehicle being equipped for this purpose with an electrical capacitance device (5), for the storage of electrical energy supplied by a rotary electrical machine (4) of the vehicle during a regenerative braking operation, wherein, on the basis of the initial speed of rotation of the said electrical machine (4), an energy regeneration strategy is chosen from at least one of the following:

a first energy regeneration strategy favoring the use of a high level of power supplied by said rotary electrical machine (4), and

a second energy regeneration strategy favoring the use of a high level of performance of said rotary electrical machine (4).

2. Process in accordance with claim 1, wherein said first energy regeneration strategy is chosen if the initial speed of rotation of said rotary electrical machine exceeds an initial threshold, fixed at a level of at least 10,000 rpm.

3. Process in accordance with claim 2, wherein said initial threshold is fixed at a speed at least equal to 12,000 rpm.

4. Process in accordance with claim 1, wherein the second energy regeneration strategy is chosen if the initial speed of rotation of said rotary electrical machine is less than a second threshold value, fixed, at the most, at 8000 rpm.

5. Process in accordance with claim 4, wherein the second threshold is fixed at a level greater than 6,000 rpm.

6. Process in accordance with claim 1, wherein the regenerative braking process is activated at the start of the braking process when the braking process is short and at a high initial speed.

7. Process in accordance with claim 1, wherein the regenerative braking process is activated at the end of the braking process when the braking process is long.

8. Process in accordance with claim 1, wherein the transitory regenerative braking process is activated while the vehicle is being driven by a heat engine in the vehicle in such a way as to displace the torque/engine speed of said heat engine by one step.

9. Installation of an energy recovery system in a vehicle comprising automatic means of control of the regenerative braking system by using a process in accordance with claim 1.