Transmission monitor/control microprocessor for continuously variable power train
This patent describes efficiency control for an engine-transmission power train of a fuel-powered vehicle of the type including a fixed range transmission having fixed, specific reduction ratios providing corresponding speed ranges and a variable range transmission providing a continuously variable range of speed reduction ratios, the variable range transmission being equipped with transmission pump and motor hydraulic units with variable displacement to vary their speed ratio, and electrically controlled hydraulic means to vary such displacement and correspondingly vary the variable transmission output speed and torque. The variable transmission includes manual means the varying the variable transmission output speed and torque consisting of: a command signal generator for connection to the electrical hydraulic means to provide thereto a main command signal for setting desired output speed of the transmission by varying the pump-and-motor speed-ratio of same as it is driven under engine power; means for storing in a memory a predetermined consecutive series of desired engine speed values which result in substantially minimum brake specific fuel consumption for a range of engine power setting; first means connected to the memory for generating a reference command indicative of that particular engine speed value which is desired corresponding to the actual engine power setting; and second means for generating a second signal indicative of the actual engine speed; third means for generating a third signal indicative of the setting of the manual means for varying the variable transmission output speed and torque; the first and second and third means having means connected to the signal generator for modifying the main command signal automatically, in response to a deficiency of one of the reference command and second signal compared to the other.
- Assignee:
- J.I. Case Co., Racine, WI
- Patent Number(s):
- US 4594666
- OSTI ID:
- 5702390
- Resource Relation:
- Patent File Date: Filed date 11 Jul 1983
- Country of Publication:
- United States
- Language:
- English
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Automatic power control for variable power train
Hydraulic control apparatus for a continuously variable transmission
Related Subjects
ENGINES
COMPUTERIZED CONTROL SYSTEMS
MECHANICAL TRANSMISSIONS
VEHICLES
EFFICIENCY
FUEL CONSUMPTION
HYDRAULIC EQUIPMENT
MEMORY DEVICES
MONITORING
PUMPS
TORQUE
VELOCITY
CONTROL SYSTEMS
ENERGY CONSUMPTION
EQUIPMENT
MACHINE PARTS
330602* - Vehicle Design Factors- Engine-Transmission Matching