Arnold G Wyatt

6341497, Jan 29, 2002

Jun 18, 2001

09/883562

Kent B. Herrick - Saline MI
Arnold G. Wyatt - Jackson MI

Tecumseh Products Company - Tecumseh MI

F25B 4900

622283, 62226

The present invention involves a reversible, dual capacity compressor system. The compressor systems includes a reversible compressor, a pressure sensor, and a control assembly. The reversible compressor operates at a first capacity when the compressor rotates in a first direction and at a second and lesser capacity when the compressor rotates in a second direction. The pressure sensor is coupled to the compressor and generates a high pressure signal and a low pressure signal. The control assembly is coupled to the compressor and the pressure sensor and controls the compressor to rotate in the first direction when receiving a high pressure signal from the pressure sensor and to rotate in the second direction when receiving a low pressure signal from the pressure sensor.

6499961, Dec 31, 2002

Oct 26, 2000

09/696905

Arnold G. Wyatt - Jackson MI
Robert L. Terry - Tecumseh MI

Tecumseh Products Company - Tecumseh MI

F04B 4900

417 36, 417 40, 417 441, 417 32

A liquid level controller for a device having a liquid reservoir includes a control board and a reservoir assembly. The reservoir assembly is disposed within the reservoir and includes a liquid level sensor, which is electrically connected to the control circuit. The control board includes a control circuit and a pump. The control circuit has a control circuit and a resistive power supply to power the control circuit. The control circuit controls the pump in response to signals from the level sensor and includes a CMOS logic gate and a MOSFET transistor to switch the pump. The control circuit further includes a second resistive power supply connected to a relay which controls an alarm. The second power supply is activated by a transistor responsive to an alarm signal from the level sensor, and powers the relay only when the alarm signal is present.

6760207, Jul 6, 2004

Dec 11, 2001

10/014692

Arnold G. Wyatt - Jackson MI
Alex Alvey - Tecumseh MI

Tecumseh Products Company - Tecumseh MI

H02H 308

361 931, 361 22

A compressor terminal fault interruption method and interrupter for disconnecting power to a compressor terminal when terminal venting failure is imminent including a current sensing circuit for sensing current provided to the terminal by a power source and outputting a sensed signal representing the current provided to the terminal and a control circuit. The control circuit includes a first circuit for outputting a reference signal representing input current much higher than locked rotor current, a second circuit connected to the current sensing circuit and the first circuit for comparing the sensed signal to the reference signal, and a third circuit connected to the second circuit for disconnecting power to the terminal when the sensed signal exceeds the reference signal, thereby preventing excessive current from reaching the compressor terminal.

7042180, May 9, 2006

Jan 23, 2004

10/763452

Robert L. Terry - Tecumseh MI, US
Arnold G. Wyatt - Jackson MI, US

Tecumseh Products Company - Tecumseh MI

H02H 5/04

318434, 318254, 318459, 318473, 388909, 361 24

A motor control system for a brushless and sensorless DC motor for driving a compressor, pump or other application, includes a protection and fault detection circuit for detecting a locked rotor and a rotor which has stopped because of lost rotor phase lock. The motor control system also includes an off-the-shelf motor control integrated circuit having an input for disabling power outputs to the motor phase coils. The protection and fault detection circuit uses a back EMF sampling circuit coupled to the motor phase coils and momentarily disables power to the motor phase coils, via the motor control integrated circuit input, to determine if the motor rotor is rotating. The system also monitors supply voltage, supply current, temperature, and motor speed limits to detect faults and protect system components.

7089088, Aug 8, 2006

Jan 23, 2004

10/763990

Robert L. Terry - Tecumseh MI, US
John A. Pasko - Ypsilanti MI, US
Arnold G. Wyatt - Jackson MI, US
Kent B. Herrick - Saline MI, US
Lee W. Marriott - Ypsilanti MI, US
Alex Alvey - Ann Arbor MI, US
Rachel Weingrad - Ann Arbor MI, US

Tecumseh Products Company - Tecumseh MI

G05D 23/00

700276

An integrated HVACR control and protection system includes a modular and reprogrammable design providing a plurality of possible combinations of power detection, voltage detection, run current detection, transient current detection, temperature detection, universal thermostat interface, peripheral or remote control, and local display and control. The control and protection system is capable of evaluating the relationship between real power used by an HVACR system compressor and other system operating parameters to detect problems early in the failure cycle, i. e. , before a failure has progressed to requiring a system shutdown or causing damage to other components. Additionally, a control system and method provide sensorless detection of various HVACR system faults, such as, for example, loss of refrigerant or a refrigerant flow restriction, that impact the relationship between real power and current, voltage, temperature, or other operating parameters. Peripheral or remote control includes wired or wireless system monitoring and parameter programming using a personal digital assistant (PDA), for example utilizing IR communication between the PDA and the control and protection system.

7352545, Apr 1, 2008

Mar 5, 2004

10/794117

Arnold G Wyatt - Jackson MI, US
Alex Alvey - Ann Arbor MI, US

Tecumseh Products Company - Tecumseh MI

H02H 5/04

361 31, 318432, 318433, 318434

A compressor terminal fault interruption method and interrupter for disconnecting power to a compressor terminal when terminal venting failure is imminent including a current sensing circuit for sensing current provided to the terminal by a power source and outputting a sensed signal representing the current provided to the terminal and a control circuit. The control circuit includes a first circuit for outputting a reference signal representing input current much higher than locked rotor current, a second circuit connected to the current sensing circuit and the first circuit for comparing the sensed signal to the reference signal, and a third circuit connected to the second circuit for disconnecting power to the terminal when the sensed signal exceeds the reference signal, thereby preventing excessive current from reaching the compressor terminal.

62728725, Aug 14, 2001

Dec 21, 1999

9/468468

Kent B. Herrick - Saline MI
Arnold G. Wyatt - Jackson MI

F25B 4900

622283

The present invention involves a reversible, dual capacity compressor system. The compressor systems includes a reversible compressor, a pressure sensor, and a control assembly. The reversible compressor operates at a first capacity when the compressor rotates in a first direction and at a second and lesser capacity when the compressor rotates in a second direction. The pressure sensor is coupled to the compressor and generates a high pressure signal and a low pressure signal. The control assembly is coupled to the compressor and the pressure sensor and controls the compressor to rotate in the first direction when receiving a high pressure signal from the pressure sensor and to rotate in the second direction when receiving a low pressure signal from the pressure sensor.