Gang S Chen

US Patent:

6351956, Mar 5, 2002

Filed:

Dec 17, 1999

Appl. No.:

09/466587

Inventors:

Gang Chen - Rochester Hills MI
James R Tamm - Ann Arbor MI
Dewane C Cogswell - Commerce MI

Assignee:

DaimlerChrysler Corporation - Auburn Hills MI

International Classification:

F25B 4902

US Classification:

62133, 62 83, 62208, 623234

Abstract:

A compressor control system and method are provided for a vehicle air conditioner. The control device controls engagement of a compressor clutch member at engine start-up to discharge liquid refrigerant from the compressor. The control system provides for disengagement of the clutch member if the detected operating conditions are indicative of compressor lock-up without the use of a dedicated compressor lock-up sensor.

US Patent:

6847879, Jan 25, 2005

Filed:

Jan 30, 2004

Appl. No.:

10/769222

Inventors:

Roland T Richardson - Detroit MI, US
Yi Cheng - Ypsilanti MI, US
Pubudu Peiris - Windsor, CA
David Parenti - Waterford MI, US
Gang Chen - Rochester Hills MI, US

Assignee:

DaimlerChrysler Corporation - Auburn Hills MI

International Classification:

G06F 700

US Classification:

701 67, 701 54, 701110

Abstract:

A method for controlling slip in an EMCC equipped torque converter is provided. The method determines whether an EMCC slip rate exceeds a predetermined RPM, determines whether a crankshaft RPM acceleration exceeds a predetermined rate, reduces an output torque of an engine in response to one of said EMCC slip rate exceeding said predetermined RPM and said crankshaft RPM acceleration exceeding said predetermined rate; and disables said output torque of an engine in response to said EMCC slip rate being less than said predetermined RPM and said crankshaft RPM acceleration being less than said predetermined rate.

US Patent:

6978201, Dec 20, 2005

Filed:

Dec 22, 2004

Appl. No.:

11/020820

Inventors:

Gang Chen - Rochester Hills MI, US
David L Kwapis - Auburn Hills MI, US
Aaron Pfadt - Salt Lake City UT, US

Assignee:

DaimlerChrysler Corporation - Auburn Hills MI

International Classification:

G06F017/00

US Classification:

701 51, 701 58, 192 325, 747311, 475125

Abstract:

A transmission control method improves shift feel during kickdown shifts. The release clutch is fully released at the initiation of the kickdown shift. The release clutch is then reapplied when the volume of the release clutch reaches a threshold capacity. The volume of the release clutch is slowly ramped down, thereby increasing turbine speed. When the turbine speed reaches a threshold, the apply clutch is actuated. The apply clutch is actuated by controlling the volume of the apply clutch according to a target volume.

US Patent:

7292922, Nov 6, 2007

Filed:

Sep 8, 2005

Appl. No.:

11/222066

Inventors:

Gang Chen - Rochester Hills MI, US
Aaron Pfadt - Salt Lake City UT, US

Assignee:

Chrysler LLC - Auburn Hills MI

International Classification:

G06F 7/00

US Classification:

701 51, 701 52, 701104, 477121, 477150, 477154, 475 73

Abstract:

A transmission control system includes a first gear engagement element that receives fluid and engages a first gear. An electromagnetic actuator selectively interrupts fluid flow to the first gear engagement element based on a duty cycle of a control signal. A control module adjusts the duty cycle so that a fluid flow rate continuously decreases as the first gear engagement element produces a first torque sufficient to hold the first gear. The flow rate is based on a first estimated volume of the fluid necessary for the first gear engagement element to produce the first torque. The control module computes a current volume of the fluid when the first gear engagement element produces the first torque. The control module adjusts a value of the first estimated volume for subsequent transmission control when a difference between the current volume and the first estimated volume is greater than a predetermined volume.

US Patent:

7353100, Apr 1, 2008

Filed:

Jun 8, 2005

Appl. No.:

11/147534

Inventors:

Gang Chen - Rochester Hills MI, US
Aaron Pfadt - Salt Lake City UT, US

Assignee:

Chrysler LLC - Auburn Hills MI

International Classification:

G06F 19/00

US Classification:

701 51, 477133

Abstract:

A method for effecting a kickdown shift in a transmission of an automotive vehicle controls turbine speed change based on a continuous desired acceleration calculation. The method determines an initial speed of a turbine that transmits torque between an engine and a plurality of gears through a plurality of releasing and engaging elements. A target speed of one of the plurality of gears is determined. A desired time required to increase the turbine speed to the target speed is determined. A desired acceleration of the turbine is calculated according to the initial speed, the target speed, and the desired time. Turbine speed change rate is controlled through controlling the clutch torque of one or more of the releasing and engaging elements based on the desired acceleration.

US Patent:

7440833, Oct 21, 2008

Filed:

Jan 24, 2006

Appl. No.:

11/338230

Inventors:

Gang Chen - Rochester Hills MI, US

Assignee:

Chrysler LLC - Auburn Hills MI

International Classification:

G06F 17/00

US Classification:

701 51, 477 70, 701 59

Abstract:

A transmission control system for a transmission including a first gear engagement element that receives a fluid and engages a first gear. The system includes an electromagnetic actuator that receives a control signal and that selectively interrupts flow of the fluid to the first gear engagement element based on a value of the control signal. The system also includes a control module that generates the control signal and that adjusts the value of the control signal so that the first gear engagement element produces a first torque sufficient to hold the first gear. The control module detects a target volume of the fluid when the first gear engagement element produces the first torque. Also, the control module extrapolates a current fill volume (i. e. , the volume at which the first gear engagement element begins to produce torque during a shift) of the first gear engagement element from the target volume.

US Patent:

7608013, Oct 27, 2009

Filed:

Sep 29, 2006

Appl. No.:

11/536734

Inventors:

Gang Chen - Rochester Hills MI, US

Assignee:

Chrysler Group LLC - Auburn Hills MI

International Classification:

F16H 61/06

US Classification:

477132, 477161

Abstract:

A method of controlling a downshift in a transmission having a main box and a compounder that has at least one gearset and at least one friction element separate from the main box includes initiating an upshift in the compounder including application of at least one friction element (e. g. a clutch) in the compounder, and releasing a friction element (e. g. a clutch) in the main box providing a swap shift. The speed phase in the compounder may trigger the speed phase in the main box, and vice versa. Target fluid volumes in one or both of a clutch being released in the main box and a clutch being applied in the compounder may be controlled and adjusted, if necessary, as a function of specific event timing in prior shifts.

US Patent:

7789797, Sep 7, 2010

Filed:

Apr 27, 2007

Appl. No.:

11/741230

Inventors:

Gang Chen - Rochester Hills MI, US
Hussein A. Dourra - Bloomfield MI, US
Maged Choucair - Dearborn Heights MI, US

Assignee:

Chrysler Group LLC - Auburn Hills MI

International Classification:

F16H 61/04

US Classification:

477116, 477 94

Abstract:

The present disclosure improves both the D-N and N-D garage shift by reducing torque applied to the powertrain mount system and vehicle suspension systems during garage shifts. Since less energy in stored in the mount system and suspension system, the reaction bump during garage shifts will be reduced without compromising vehicle performance. For the N-D garage shift, such as after key-on when a shift lever is positioned in drive, a vehicle shifts to second gear (or some other higher gear) which provides reduced torque applied to the powertrain mount system and vehicle suspension system. For the D-N garage shift, as a vehicle slows down to a zero speed with the brake on, the vehicle is shifted into a higher gear. As the vehicle starts to launch, the vehicle is immediately shifted back to first gear, launching the vehicle with its first gear ratio.