Method of controlling electronic differential

• US 20070179699A1
• Filed: 02/02/2006
• Published: 08/02/2007
• Est. Priority Date: 02/02/2006
• Status: Abandoned Application

• Current Assignee: Dana Automotive Systems Group, LLC (Dana, Inc.)
• Original Assignee: Dana Automotive Systems Group, LLC (Dana, Inc.)
• Inventors: Kinsey, Gerald
• Application Number:
  US11/345,395
• Publication Number:
  US 20070179699A1
• Time in Patent Office: Days
• US Class Current: 701/82
• CPC Class Codes: B60K 17/20 in which the differential movement is limited
• CPC Class Codes: B60K 17/344 having a transfer gear
• CPC Class Codes: B60K 28/165 acting on elements of the vehicle drive train other than the propulsion unit and brakes, e.g. transmission, clutch, differential acting on brakes B60T8/17
• CPC Class Codes: B60T 2201/14 Electronic locking-differential
• CPC Class Codes: B60T 2201/16 Curve braking control, e.g. turn control within ABS control algorithm
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02
• CPC Class Codes: B60W 2520/125 Lateral acceleration

Abstract

The present invention is directed to a method of controlling an electronic differential to prevent wheel slip. A predetermined amount of lateral acceleration is determined for a given driving condition and/or particular vehicle; an amount indicative of imminent wheel slip. Lateral acceleration is detected and the electronic differential is selectively engaged when the sensed lateral acceleration approaches or reaches a predetermined amount of lateral accelerations to engage the electronic differential prior to wheel slip.

Claims

1. A method of controlling an electronic differential to prevent wheel slip in a vehicle, said method comprising the steps of:

determining a predetermined amount of lateral acceleration required to cause wheel slip for said vehicle;

detecting a detected amount of lateral acceleration of said particular vehicle;

comparing said detected amount with said predetermined amount;

selectively engaging said electronic differential based on said step of comparing to engage said electronic differential prior to an occurrence of wheel slip.

2. The method according to claim 1, wherein said step of said determining a predetermined amount of lateral acceleration includes determining a predetermined amount of lateral acceleration required to cause wheel slip on an inside wheel during a turning maneuver in a particularly vehicle, said step of selectively engaging said electronic differential occurring when said detected amount of lateral acceleration approaches but does not exceed said predetermined amount of lateral acceleration thereby reducing a response time for said electronic differential to engage and limits slip of said inside wheel when said lateral acceleration reaches or exceeds said predetermined amount of lateral acceleration and said inside wheel begins to slip.

3. The method according to claim 1, wherein said step of selectively engaging said electronic differential is solely dependent on said step of comparing said detected amount with said predetermined amount of lateral acceleration.

4. The method according to claim 2, wherein said step of selectively engaging said electronic differential is solely dependent on said step of comparing said detected amount with said predetermined amount of lateral acceleration.

5. The method according to claim 2, wherein said step of determining said predetermined lateral acceleration required to cause wheel slip of said inside wheel is dependent upon the physical characteristics of said particular vehicle.

6. The method of claim 1, where said electronic said predetermined amount of lateral acceleration equals 1.1 G-force, and said step of selectively engaging said electronic differential engages said electronic differential when said detected amount of lateral acceleration equals said predetermined amount of lateral acceleration regardless of any other vehicle condition.

7. The method according to claim 1, wherein said step of selectively engaging said electronic differential based on said step of comparing to engage said electronic differential prior to an occurrence of wheel slip occurs when said vehicle is engaged in a turn while traveling at or above a predetermined speed, and when said vehicle is traveling below said vehicle speed said electronic differential is controlled by a separate algorithm.

8. The method according to claim 1, wherein said predetermined amount of lateral acceleration equals 1.1 G-force and said step of selectively engaging said electronic differential based on said step of comparing said detected amount with said predetermined amount to engage said electronic differential prior to an occurrence of wheel slip occurs when said vehicle is engaged in a turn while traveling at or above a predetermined speed and said detected amount of lateral acceleration equals or exceeds said predetermined amount of lateral acceleration regardless of any other vehicle condition, and when said vehicle is traveling below said vehicle speed said electronic differential is controlled by a separate algorithm dependent on a plurality of sensed vehicle conditions.