Mark D Lubbers, 612575 Antietam Dr, Ann Arbor, MI 48105

8152245, Apr 10, 2012

Sep 9, 2005

11/662482

Mark D. Lubbers - Ann Arbor MI, US

Kelsey-Hayes Company - Livonia MI

B60T 8/64

303151, 303152

A method is provided for controlling the braking of a vehicle that has a first set of friction brakes for applying a first apply brake force to a first set of wheels and a second set of friction brakes for applying a second brake apply force to a second set of wheels. A powertrain assembly is coupled to the second set of wheels. The powertrain assembly includes a regenerative braking unit capable of recapturing kinetic energy from the second set of wheels. The vehicle is braked in a first phase of control using regenerative braking to brake the second set of wheels to achieve up to a first value of braking. The vehicle is braked in a second phase of control using the regenerative braking to maintain braking of the second set of wheels at the first value of braking force while selectively applying the first friction brakes to the first set of wheels up to a second value of braking.

8457854, Jun 4, 2013

Nov 29, 2007

12/516821

Mark D. Lubbers - Ann Arbor MI, US

Kelsey-Hayes Company - Livonia MI

B60T 8/17
F16D 55/224
G06F 19/00

701 70, 701 78, 303191

An algorithm for limiting the output of a master cylinder pressure sensor in an electronic brake control system to a value that is a function of the master cylinder pressure and the travel of the brake pedal.

2008024, Oct 9, 2008

Aug 26, 2005

11/661539

Arnie Spieker - Commerce Township MI, US
Mark D. Lubbers - Ann Arbor MI, US
Michael O'Connor - Royal Oak MI, US

Kelsey-Hayes Company - Livonia MI

B60T 8/88

30312208

A method is provided for detecting a fault condition in a hydraulic brake system of a vehicle having a first hydraulic brake circuit and a second hydraulic brake circuit. A correlation ratio is determined between a measured pressure and the actual vehicle acceleration. A first wheel velocity differential is determined and a second wheel velocity differential is determined. A weighting value is selected in response to determining whether the correlation ratio is within the predetermined range and whether the first wheel velocity differential and the second wheel velocity differential are opposite signs. The selected weighting value is added to a fault counter. A determination is made whether the fault counter is equal to or greater than a predetermined threshold. A fault condition is detected in response to the fault counter greater than or equal to the first predetermined threshold.

6216457, Apr 17, 2001

Nov 13, 1998

9/191965

Mark D. Lubbers - Ann Arbor MI
Richard J. Barron - Ann Arbor MI
Harry A. Hunnicutt - Ann Arbor MI
Louis S. Tang - Novi MI
Gregory J. Krawczyk - Livonia MI

Kelsey-Hayes Company - Livonia MI

B60T 1300

605472

A vehicle hydraulic system is disclosed comprising a hydraulic fluid reservoir; a pressure force supplying pressurized hydraulic fluid to a discharge header; a fluid conduit between the discharge header and the reservoir; a back pressure valve operative in the fluid conduit to maintain a desired pressure in the discharge header; and a vehicle braking system having a hydraulically operated boost piston assembly for supplementing a force exerted by a vehicle operator to operate brakes of the vehicle braking system. The system further includes a boost pressure control valve responsive to an input from the vehicle operator for selectively directing pressured hydraulic fluid from the discharge header to the boost piston assembly and venting hydraulic fluid from the boost piston assembly to the reservoir.

6149248, Nov 21, 2000

Nov 13, 1998

9/191177

Mark D. Lubbers - Ann Arbor MI
Gerald M. Sivulka - Ann Arbor MI
Edward N. Fuller - Manchester MI
Stephen H. Youtsey - Palo Alto CA
Richard J. Barron - Ann Arbor MI

Kelsey-Hayes Company - Livonia MI

F16D 3102

3031141

A vehicle hydraulic system is disclosed comprising a pressure source supplying pressurized hydraulic fluid to a discharge header, a vehicle braking system having a hydraulically operated boost piston assembly for supplementing a force exerted by a vehicle operator to operate brakes of the vehicle braking system; a boost pressure control valve for selectively directing pressurized hydraulic fluid from the discharge header to boost piston assembly and venting hydraulic fluid from the boost piston assembly; and a sensor for receiving an input from a vehicle operator and supplying an electrical signal to the boost pressure control valve to control the operation thereof.

6007160, Dec 28, 1999

Feb 20, 1998

9/026973

Mark D. Lubbers - Ann Arbor MI
Danny R. Milot - Ann Arbor MI
Richard J. Barron - Ann Arbor MI
Gregory J. Krawczyk - Livonia MI

Kelsey-Hayes Company - Livonia MI

F16D 3102

3031141

A method of controlling the operation of an electrohydraulic brake booster to achieve a desired pedal feel. The method includes sensing brake pedal movement from a fully retracted rest position before a significant resistance to travel of the brake pedal is developed. The method further includes generating a command pulse that results in application of pressurized hydraulic fluid to the boost piston assembly sufficient to overcome preloaded spring forces and seal friction in the boost piston assembly that would otherwise tend to resist further brake pedal travel. The method further includes providing a control signal override when a brake pedal "bounce" condition is detected to avoid undesired vehicle braking. A brake pedal bounce condition may occur if the brake pedal is released suddenly so that the brake pedal returns to the fully retracted rest position rapidly enough to bounce off of a mechanical stop at that position and move in the brake apply direction.

5983637, Nov 16, 1999

Oct 28, 1997

8/958579

Mark D. Lubbers - Ann Arbor MI
Herbert L. Linkner - Dexter MI
Gregory J. Krawczyk - Livonia MI
Richard J. Barron - Ann Arbor MI

Kelsey-Hayes Company - Livonia MI

B60T 1320

60549

A brake booster for a brake system of a vehicle, wherein the brake booster is in fluid communication with a source of pressurized fluid. The brake booster includes a housing having a bore formed therein and a conduit formed therein being in fluid communication with the bore and the source of pressurized fluid. The brake booster includes first and second pistons slidably disposed within the bore of the housing. The bore, the first piston, and the second piston define a fluid chamber in fluid communication with the conduit formed in the housing, wherein the volume of the chamber is defined by the position of the first piston relative to the second piston. The brake booster further includes a valve selectively preventing fluid flow in a direction from the chamber to the source of pressurized fluid via the conduit.