Zhijian J Wu, Age 68814 Mayfair Ct, Rochester Hills, MI 48309

6902319, Jun 7, 2005

Jan 8, 2004

10/754062

Zhijian James Wu - Rochester Hills MI, US
Dean Marshall - Clarkston MI, US
Brad Schoeff - Sterling Hts. MI, US
Michel Trumbo - Troy MI, US
John G Hatfield - Leonard MI, US
James Karlet - Toledo OH, US
Yijun Tu - Tecumseh, CA

DaimlerChrysler Corporation - Auburn Hills MI

H02J007/14
G01K003/02

374141, 374152, 320150, 324431

A method of estimating an internal temperature of a vehicle battery is based on heat transfer between a heat source and the battery. In addition to the heat source, airflow generated by vehicle movement and radiator fans affects the internal temperature of the battery. The method estimates an initial internal temperature of the battery at engine startup based on how long the engine was off. The temperature of the heat source is determined. A transfer function is determined to represent the effect of the airflow. The method updates a current internal temperature of the battery based on the initial internal temperature and an integration of the transfer function and the heat source temperature.

6978666, Dec 27, 2005

Sep 8, 2004

10/935871

Zhijian James Wu - Rochester Hills MI, US
Min Han - Troy MI, US
Anson Lee - St. Clair MI, US

DaimlerChrysler Corporation - Auburn Hills MI

G01M015/00

731173

The present invention provides a method and system for systematically calibrating an engine misfire detection system for an internal combustion engine. The present invention provides a method of collecting a plurality of groups of sample data points. Each of the groups of sample data points represents a cylinder firing event. Optionally, misfire events can be induced during the collection of the groups of sample data points. Using the collected data points, a plurality of compensation parameters is then generated and applied iteratively to the sample data points to generally optimize the detection of misfire occurrences. Compensation parameters that produce a high accuracy misfire detection are selected and can be exported from the calibration system to transport to an engine controller in an internal combustion engine. Compensation of edge-to-edge error in engine speed data, engine noise, misfire signal magnitude, and filtering zone boundary coefficients enhance signal quality and further enhance misfire detection.

7032439, Apr 25, 2006

Sep 11, 2003

10/660036

Anson Lee - St. Clair MI, US
Zhijian James Wu - Rochester Hills MI, US

DaimlerChrysler Corporation - Auburn HIlls MI

G01M 15/00

731173

A method of detecting misfire events in an engine uses system identification technology. A linear model is determined for estimating engine firing events based on engine speed fluctuations. The linear model is represented as a difference equation. A Kalman filter is applied to the difference equation to determine unknown parameters of the linear model. Misfire events in the engine are detected based on the linear model.

7660694, Feb 9, 2010

Sep 12, 2006

11/531069

Zhijian J. Wu - Rochester Hills MI, US
Michel Trumbo - Troy MI, US
Yijun Tu - Tecumseh, CA
Min Han - Troy MI, US

Chrysler Group LLC - Auburn Hills MI

G06G 7/70

702130, 324431, 320150, 320155

A method and arrangement is provided for estimating an initial value for an internal battery temperature of a vehicle using a four zone process that determines which of a predetermined set of time zones correlates with a measured period of time for an engine of the vehicle being in an engine-off condition. Once the time zone is determined, an initial estimated value of the internal temperature of the battery is determined as a function of a set of parameters correlated with the determined time zone. The set of time zones include a holding time zone, a model based estimation time zone which is greater in time than the holding time zone, a first self-adjustment zone which is greater in time than the model based estimation time zone, and a second self-adjustment time zone which is greater in time than the first self-adjustment time zone.

2007009, Apr 26, 2007

Jul 11, 2006

11/456789

Zhijian Wu - Rochester Hills MI, US
Michel Trumbo - Troy MI, US
Yijun Tu - Tecumseh, CA
Min Han - Troy MI, US

G06G 7/70
G06F 19/00

701099000

A method and arrangement is provided for estimating an initial value for an internal battery temperature of a vehicle using a four zone process that determines which of a predetermined set of time zones correlates with a measured period of time for an engine of the vehicle being in an engine-off condition. Once the time zone is determined, an initial estimated value of the internal temperature of the battery is determined as a function of a set of parameters correlated with the determined time zone. The set of time zones include a holding time zone, a model based estimation time zone which is greater in time than the holding time zone, a first self-adjustment zone which is greater in time than the model based estimation time zone, and a second self-adjustment time zone which is greater in time than the first self-adjustment time zone.

2013026, Oct 10, 2013

Apr 5, 2012

13/440126

Zhijian James Wu - Rochester Hills MI, US
Richard A. Kulas - Dexter MI, US
Jay C. McCombie - Rochester Hills MI, US
Gregory L. Ohl - Ann Arbor MI, US

CHRYSLER GROUP LLC - Auburn Hills MI

G01M 15/04
F02D 41/00

701103, 7311472

A method of estimating the individual fuel air ratio richness of an individual cylinder in an engine by utilizing a single oxygen sensor at the confluence of a plurality of exhaust runners. The method provides for the use of a wide range or switching oxygen sensor at the confluence of a plurality of exhaust runners.

6286366, Sep 11, 2001

Nov 11, 1998

9/189719

Gang Chen - Rochester Hills MI
Zhijian James Wu - Rochester Hills MI
Anson Lee - St. Clair MI
Kerry D. Franks - Chelsea MI
Timothy L. McDonald - Novi MI
James R. Tamm - Ann Arbor MI

Chrysler Corporation

G01L 326
G01L 213
G01M 1500

731173

A technique for determining the charge air temperature within an intake manifold of an internal combustion engine of a vehicle without using a dedicated temperature sensor. The technique includes identifying a non-linear dynamic model based on the physical concepts of thermal transfer and system identification technique. The charge air temperature model uses several available physical measurements from the vehicle, including inlet air temperature, engine coolant temperature, vehicle speed, manifold pressure, engine speed, exhaust gas recirculation condition, and the engine fan on/off state. The model parameters are determined based on specific vehicle characteristics, and collected data from the vehicle. The charge air temperature is predicted by the model at regular predetermined intervals from the physical measurements, the vehicle parameters and the charge air temperature from the previous time. An estimation of an initial charge air temperature when the vehicle is turned on can be obtained based on the available temperature sensor readings when vehicle is turned on and stored data of the charge temperature, and all the measured temperature readings just before the engine was turned off.

6006155, Dec 21, 1999

Aug 12, 1998

9/132872

Zhijian James Wu - Rochester Hills MI
Anson Lee - St. Clair MI

Chrysler Corporation - Auburn Hills MI

F02D 4100

701111

A method and system for detecting engine misfire in an internal combustion engine. A data signal containing a plurality of groups of data points generated from sampling crankshaft rotational displacement over three pre-determined angular sampling windows; is generated. Each of the plurality of groups of sampled data points represents a cylinder firing event. The data signal is conditioned, and the plurality of groups of sampled data points are, mapped into single misfire data points. The mapped single misfire detection points are then compared to a misfire detection dynamic threshold, and a misfire detection signal is output if the misfire detection points fall outside the dynamic threshold. The misfire detection system achieves high degree of accuracy through a multi-stage signal conditioning, multi-rate signal processing and statistical decision technology and a mixed size of window sampling strategy, and is capable of being installed on a large scale in motor vehicles through use of existing on board automotive microcontroller technology.