Shift strategies for mock continuously variable transmission

An electromechanical transmission down-shift strategy for optimizing engine power demand performance of a motor vehicle, wherein an optimal power transmission gear ratio has been established for each ground speed of said vehicle for given actual engine speed and torque values, said strategy including the steps of:

• a) selecting a next lowest gear ratio, based upon a target down-shift engine speed, whenever said actual engine speed approaches a value below said target engine speed;
• b) continuing selections of successive next lowest gear ratios based upon a series of target down-shift engine speeds in a manner that permits engagement of said next lowest gear ratio whenever said actual engine speed approaches said lower value below said next successive target engine speed;
• and
• c) wherein said next optimal power transmission gear ratio is calculated prior to each successive down-shift.

An electromechanical transmission up-shift strategy for optimizing engine power demand performance of a motor vehicle, wherein an optimal power transmission gear ratio has been established for each ground speed of said vehicle for given actual engine speed and torque values, said strategy including the steps of:

• a) selecting a next highest gear ratio, based upon a target up-shift engine speed, whenever said actual engine speed approaches a value above said target engine speed;
• b) continuing selections of successive next highest gear ratios based upon a series of target up-shift engine speeds in a manner that permits engagement of said next highest gear ratio whenever said actual engine speed approaches said higher value above said next successive target engine speed;
• and
• c) wherein said next power transmission gear ratio is calculated prior to each successive up-shift.

An electromechanical transmission strategy for selectively choosing a shift strategy for a) optimizing engine fuel economy of a motor vehicle, or b) optimizing the engine power demand performance of a motor vehicle;

• wherein a) an optimal fuel economy transmission gear ratio has been established for each ground speed of said vehicle for given actual engine speed and torque values, or b) an optimal power transmission gear ratio has been established for each ground speed of said vehicle for given actual throttle position, engine speed, and torque values;
• said strategy including the steps of:
• a) selecting a next appropriate gear ratio, based upon a target shift engine speed, whenever said actual engine speed approaches a value near said target engine speed;
• b) continuing selections of successive next gear ratios based upon a series of target shift engine speeds in a manner that permits engagement of said next gear ratio whenever said actual engine speed approaches said next value near said next successive target engine speed;
• and
• c) wherein said strategy is a) responsive to selecting the optimal fuel economy mode, and calculates best fuel economy ratio prior to each next successive shift if driving conditions do not indicate power performance requirements, and is b) responsive to selecting the power mode, and calculates best power ratio prior to each next successive shift if driving conditions do not indicate economy performance is warranted.