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Title: Control system and method for a power delivery system having a continuously variable ratio transmission

A control system and method for a power delivery system, such as in an automotive vehicle, having an engine coupled to a continuously variable ratio transmission (CVT). Totally independent control of engine and transmission enable the engine to precisely follow a desired operating characteristic, such as the ideal operating line for minimum fuel consumption. CVT ratio is controlled as a function of commanded power or torque and measured load, while engine fuel requirements (e.g., throttle position) are strictly a function of measured engine speed. Fuel requirements are therefore precisely adjusted in accordance with the ideal characteristic for any load placed on the engine.
  1. (1034 Hillside Ave., Madison, WI 53705)
Issue Date:
OSTI Identifier:
Frank, Andrew A. (1034 Hillside Ave., Madison, WI 53705) LLNL
Patent Number(s):
US 4458561
Contract Number:
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
control; method; power; delivery; continuously; variable; ratio; transmission; automotive; vehicle; engine; coupled; cvt; totally; independent; enable; precisely; follow; desired; operating; characteristic; ideal; line; minimum; fuel; consumption; controlled; function; commanded; torque; measured; load; requirements; throttle; position; strictly; speed; adjusted; accordance; placed; ratio transmission; automotive vehicle; variable ratio; continuously variable; commanded power; engine speed; fuel consumption; independent control; engine coupled; operating characteristic; power delivery; /477/