Line lock braking system and method for a vehicle

Patent metadata

Field	Value
Publication number	US-9731721-B1
Application number	US-201615041374-A
Country	US
Kind code	B1
Filing date	Feb 11, 2016
Priority date	Feb 11, 2016
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A line lock braking system includes a brake module configured to selectively apply hydraulic braking pressure against first wheels and second wheels of the vehicle, and a controller in signal communication with the brake module. The controller initiates, upon receipt of a request, a vehicle line lock mode and performs line lock braking of the vehicle where the brake module is controlled to selectively apply braking pressure against the first wheels and not the second wheels such that the second wheels are free to rotate based on a throttle applied by a driver; completes the line lock mode upon release of a button being depressed to enter and maintain activation of the line lock mode such that the braking pressure against the first wheels is released; and cancels the line lock mode upon determining a number of rotations of the second wheels exceeds a predetermined number of wheel rotations.

First claim

What is claimed is:

1. A line lock braking system for a vehicle, the system comprising:
brake module integrated control unit (ICU) configured to selectively apply hydraulic braking pressure against front wheels and rear wheels of the vehicle; and
a controller in signal communication with the brake module, the controller configured to:
upon receipt of a request, initiate a vehicle line lock mode and perform a line lock braking of the vehicle where the brake module ICU is controlled to selectively apply hydraulic braking pressure against the front wheels and not the rear wheels such that the rear wheels are free to rotate based on a throttle applied by a driver of the vehicle;
monitor, during the vehicle line lock mode, a number of rotations of the rear wheels while the front wheels are maintained in a substantially stationary state by the brake module ICU;
upon release of a button being depressed to enter and maintain activation of the vehicle line lock mode, complete the vehicle line lock mode such that the hydraulic braking pressure against the front wheels is released; and
deactivate the vehicle line lock mode upon determining the number of rotations of the rear wheels exceeds a predetermined number of wheel rotations during the vehicle line lock mode.

2. The system of claim 1 , wherein upon canceling the vehicle line lock mode when the predetermined number of wheel rotations is exceeded, the controller is configured to:
control the brake module ICU to apply hydraulic braking pressure against the rear wheels.

3. The system of claim 1 , further comprising a user interface in signal communication with the controller, the controller configured to receive the request from the user interface indicating the driver has selected the vehicle line lock mode.

4. The system of claim 3 , wherein the controller is configured to prompt the driver to utilize the user interface to enter information for use in determining the predetermined number of wheel rotations, the information including at least one of a tire type and a track or road surface temperature.

5. The system of claim 4 , wherein during the vehicle line lock mode, the controller is configured to cause the user interface to display a real-time running count of the monitored number of rotations of the rear wheels and, upon the monitored number of wheel rotations of the rear wheels approaching the predetermined number of rotations, the controller is configured to cause the user interface to display a message indicating the vehicle line lock mode will be canceled upon the monitored number of rotations of the rear wheels exceeding the predetermined number of rotations.

6. The system of claim 3 , further comprising the controller causing the user interface to display a message indicating the vehicle line lock mode has been canceled due to the predetermined number of wheel rotations being exceeded.

7. The system of claim 3 , wherein the predetermined number of wheel rotations is between 300 rotations and 500 rotations.

8. The system of claim 3 , wherein the controller is configured to determine whether an initial vehicle precondition is satisfied before enabling the vehicle to enter the vehicle line lock mode, the initial precondition including at least one of:
(a) a speed of the vehicle is less than or equal to 10 MPH;
(b) an engine RPM is greater than 500 RPM;
(c) a temperature of a transmission of the vehicle is not over a predetermined temperature;
(d) the engine is running;
(e) no current active electronic stability control (ESC) faults are present;
(f) a radiator coolant temperature is less than approximately 250° F.;
(g) an odometer is greater than a predetermined number;
(h) a valet mode is not active;
(i) vehicle doors are closed; and
(j) a cruise control is not enabled or active.

9. The system of claim 3 , wherein the controller is configured to determine whether a secondary vehicle precondition is satisfied before enabling the vehicle to enter the line lock braking mode, the secondary vehicle precondition including at least one of:
(i) a speed of the vehicle is zero MPH;
(ii) a brake pedal pressure is greater than a predetermined pressure;
(iii) a vehicle transmission is in a forward gear; and
(iv) a vehicle traction control is off.

10. The system of claim 1 , wherein the controller is configured to deactivate the vehicle line lock mode if at least one of the following occurs during the vehicle line lock mode:
(1) wheel speed sensors indicate the rear wheels have rotated more than the predetermined number of wheel rotations;
(2) an initial precondition occurs;
(3) a secondary precondition occurs;
(4) a vehicle brake pedal is depressed;
(5) a vehicle accelerator pedal is released;
(6) the vehicle rotates beyond a predetermined angle; and
(7) a pressure of one of the rear wheels is less than or equal to a predetermined minimum pressure.

11. A method of performing vehicle line lock braking, the method comprising:
receiving, at a controller, a request for a vehicle line lock mode;
initiating the vehicle line lock mode when the request is received by applying hydraulic braking pressure against front wheels and not rear wheels of the vehicle such that the rear wheels are free to rotate based on a throttle applied by a driver of the vehicle;
monitoring, during the vehicle line lock mode, a number of rotations of the rear wheels while the front wheels are maintained in a substantially stationary state by a brake module integrated control unit (ICU) of the vehicle;
completing the vehicle line lock mode, upon release of a button being depressed to enter and maintain activation of the vehicle line lock mode, such that the hydraulic braking pressure against the front wheels is released; and
deactivating the vehicle line lock mode upon determining the number of rotations of the rear wheels exceeds a predetermined number of wheel rotations during the vehicle line lock mode.

12. The method of claim 11 , wherein upon canceling the vehicle line lock mode when the number of rotations of the rear wheels exceeds the predetermined number of wheel rotations, the controller is further configured to:
control the brake module ICU to apply hydraulic braking pressure against the rear wheels.

13. The method of claim 11 , further comprising the controller causing a user interface of the vehicle to display a message to prompt the driver to utilize the user interface to enter information for use in determining the predetermined number of wheel rotations, the information including at least one of a tire type and a track or road surface temperature.

14. The method of claim 11 , further comprising the controller causing a user interface of the vehicle to display a message indicating the vehicle line lock mode has been canceled due to the predetermined number of wheel rotations being exceeded.

15. The method of claim 11 , further comprising, during the vehicle line lock mode, the controller causing a user interface of the vehicle to display a real-time running count of the monitored number of rotations of the rear wheels and, upon the monitored number of rotations of the rear wheels approaching the predetermined number of wheel rotations, the controller causing the user interface to display a message indicating the vehicle line lock mode will be canceled upon the monitored number of rotations of the rear wheels exceeding the predetermined number of wheel rotations.

16. The method of claim 11 , further comprising the controller determining whether an initial vehicle precondition is satisfied before enabling the vehicle to enter the vehi

Assignees

• Wilder James M
• Anker Jeremy J
• Uehlein Jeffrey
• Rodriguez Paul
• Ehsan Farhan
• Fca Us Llc

Inventors

• Wilder James M
• Anker Jeremy J
• Uehlein Jeffrey
• Rodriguez Paul
• Ehsan Farhan

Classifications

• B60W2530/20

  Tyre data · CPC title

• B60W2510/30

  Auxiliary equipments · CPC title

• B60Y2300/18025

  Drive off, accelerating from standstill · CPC title

• B60W30/18109

  Braking · CPC title

• B60W2510/18

  Braking system · CPC title