Michael B Carlson

US Patent:

7908877, Mar 22, 2011

Filed:

Jul 18, 2008

Appl. No.:

12/175513

Inventors:

Michael H. Carlson - Madison Heights MI, US
Lawrence P. Ziehr - Clarkston MI, US
Todd M. Tumas - Taylor MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

F25B 49/00
B60W 20/00

US Classification:

62157, 62231, 180 6527

Abstract:

A method of controlling a HVAC system for a hybrid vehicle having a refrigerant compressor driven by an engine is disclosed. The method may comprise: determining a requested air conditioning operating point for a passenger compartment; estimating a time to reach the requested operating point; based on the previous steps, estimating a maximum allowed compressor off time; determining if the allowed compressor off time is greater than a minimum engine off time; if the allowed compressor off time is greater than the engine off time, determining if the vehicle is entering an allowable engine off mode; if so, commencing engine shut-off mode; if engine shut-off is anticipated, prior to commencing the shut-off mode, adjusting the HVAC system to maximize cooling of the passenger compartment with minimum energy usage; and if the engine shut-off is commenced, monitoring the HVAC system to determine when engine restart is needed to maintain comfort.

US Patent:

8430071, Apr 30, 2013

Filed:

Jul 10, 2009

Appl. No.:

12/500737

Inventors:

Michael H. Carlson - Madison Heights MI, US
George T Washburn - Royal Oak MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

F01P 7/14

US Classification:

123 4144, 123 411, 123 4147, 236 345

Abstract:

An engine cooling system for a vehicle, and method of operation, includes both an engine driven main coolant pump that may be disengaged by a clutch and an electrically driven auxiliary coolant pump, where each can be used separately or they can be used together to control the amount of coolant flow through the engine cooling system.

US Patent:

20160347150, Dec 1, 2016

Filed:

May 26, 2015

Appl. No.:

14/721411

Inventors:

- Detroit MI, US
Prashant Mer - Khatriwad, IN
Vish S. Iyer - Rochester Hills MI, US
Michael H. Carlson - Madison Heights MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

International Classification:

B60H 1/00
F01P 7/16
F01P 11/16
B60H 1/03

Abstract:

A thermal management system includes a coolant pump, high-voltage electric heater (HEH) for heating the coolant, a heater core, a blower directing air to the heater core, a cabin heater valve (CHV), sensors, and a controller. The CHV has an Engine Bypass position blocking coolant flow from the HEH into the engine, and an Engine Link position directing coolant from the HEH into the engine. In a method, the sensors measure engine outlet coolant temperature (ECT), inlet coolant temperature (ICT) to the HEH, inlet air temperature into the heater core, and outlet air temperature from the heater core. The controller calculates a target coolant temperature (TCT) value as a function of the air temperatures and mass flow rates, and controls the CHV via position control signals such that the CHV is switched between the Engine Link position and the Engine Bypass position when ICT equals the calculated TCT value.