Hua Z Zeng, 45Bloomfield, MI

2012024, Oct 4, 2012

Mar 30, 2011

13/075238

Masayoshi Takahashi - West Bloomfield MI, US
Hua Zeng - Novi MI, US

Hitachi, Ltd. - Tokyo

H04B 3/28
H03H 7/00

333 12, 333172

In a vehicle network for controlling electronic devices of the type having a network driver with at least one output line connected to the network through a common mode choke. A circuit for improving the immunity of the network includes a resistor and a capacitor connected in series between the signal output line and ground. The series resistor and capacitor protect the network from communication errors.

2013008, Apr 4, 2013

Oct 4, 2011

13/252306

Hua Zeng - Novi MI, US
Masayoshi Takahashi - West Bloomfield MI, US

Hitachi, Ltd - Tokyo

B60L 1/00
H05K 7/00

307 101, 36167901

A system for reducing electromagnetic noise generated by common mode currents in electrical connections of a power inverter and battery in an electric or hybrid electric vehicle. A pair of spaced apart electrical conductors extends along the vehicle chassis and electrically connects the power inverter to the battery. An electrically conductive metal plate is positioned in between the spaced apart electrical conductors. This metal plate is electrically connected to the chassis adjacent at least both of the power inverter and the battery/motor. Besides this, more connecting points are required to keep the distance between two points less than half wavelength of the maximum frequency of EMI requirements, and most preferably this metal plate is electrically connected to the chassis all the way with infinite connecting points. The metal plate is positioned so that the metal plate is closer to the electrical conductors than the space in between the electrical conductors and the vehicle chassis.

2014006, Mar 6, 2014

Aug 29, 2012

13/597602

Masayoshi Takahashi - West Bloomfield MI, US
Hua Zeng - Novi MI, US

Hitachi, Ltd - Tokyo

G01R 29/26

324613

A method for identifying EMI sources in a system having a plurality of electrical components connected together by cables wherein each set of two electrical components connected by a cable forms a potential EMI source. A plurality of antennas are positioned around the vehicle and the EMI from each antenna is measured over a plurality of frequencies and the frequencies having an EMI greater than a predetermined threshold and a measurement profile of the received EMI versus the antennas for each of the identified frequencies is created. EMI reception is then simulated for each potential EMI source and a simulation profile of the received EMI versus the antennas is plotted for each potential EMI source. The actual source of the EMI is then identified by comparing the measurement profile with the simulation profile for the potential EMI sources at each frequency to determine a match of the profiles.

2018004, Feb 8, 2018

Oct 19, 2017

15/788350

- Dearborn MI, US
Tye Arthur Winkel - Canton MI, US
Mark Wisnewski - Stockbridge MI, US
Lawrence Banasky - Livonia MI, US
John Frederick Locke - Waterford MI, US
Hua Zeng - Novi MI, US

G07C 9/00

Various embodiments of the present disclosure provide a system and method for characterizing the radio frequency (RF) functionality of a vehicle remote keyless system (RKS) by separating and precisely characterizing the individual bits of the overall RKS system in an enclosed controlled environment. More specifically, this RKS characterization system includes an enclosed testing chamber for isolating the key fob from the vehicle, and a simulation control system that manipulates RF signals between the key fob and the vehicle for controlled RF signal analysis between the components. In certain embodiments, the RKS characterization system includes an automated process for actuating the key fob. Through this process, the RKS characterization system is able to separately identify the Key Fob Factor, the Vehicle Factor, and the Person Factor, of the vehicle RKS system.

2017029, Oct 12, 2017

Apr 12, 2016

15/096984

- Dearborn MI, US
Tye Arthur Winkel - Canton MI, US
Mark Wisnewski - Stockbridge MI, US
Lawrence Banasky - Livonia MI, US
John Frederick Locke - Waterford MI, US
Hua Zeng - Novi MI, US

H04B 17/15
G07C 9/00

Various embodiments of the present disclosure provide a system and method for characterizing the radio frequency (RF) functionality of a vehicle remote keyless system (RKS) by separating and precisely characterizing the individual bits of the overall RKS system in an enclosed controlled environment. More specifically, this RKS characterization system includes an enclosed testing chamber for isolating the key fob from the vehicle, and a simulation control system that manipulates RF signals between the key fob and the vehicle for controlled RF signal analysis between the components. In certain embodiments, the RKS characterization system includes an automated process for actuating the key fob. Through this process, the RKS characterization system is able to separately identify the Key Fob Factor, the Vehicle Factor, and the Person Factor, of the vehicle RKS system.

2017006, Mar 9, 2017

Sep 8, 2015

14/847751

- Tokyo, JP
Hua Zeng - Novi MI, US
Masayoshi Takahashi - Yokohama, JP
Hiroki Funato - Chigasaki, JP

G01N 27/82
B23K 31/12

An apparatus and method for inspecting the quality of a weld under test in a structure having a plurality of spaced apart welds. Two probes are placed on opposite sides of the structure so that a current path is formed through the weld under test. The probes are energized with alternating current at a known frequency. The magnetic flux generated from the current flow through the probes and at least one of the spaced apart welds is then measured and subsequently compared with magnetic flux data previously determined and representing weld quality.

2015002, Jan 29, 2015

Jul 25, 2013

13/950403

- Tokyo, JP
Hua Zeng - Novi MI, US
Masayoshi Takahashi - West Bloomfield MI, US
Hiroki Funato - Yokohama, JP

Hitachi, Ltd. - Tokyo

G01R 29/26

324613

A system and method for identifying an electrical noise propagation path through an object, such as an automotive vehicle, from a source of periodic electrical noise. An electrical noise sensor is positioned at a selected area on the object which generates an output signal representative of the magnitude of the electrical noise. A trigger generator generates a trigger signal in synchronism with a source of periodic electrical noise and that trigger signal is connected as an input signal to measurement equipment connected to the sensor to initiate electrical noise reading by the sensor. A recorder then records the output from the sensor. The electrical noise sensor is moved to different areas on the object to determine the electrical noise propagation path.