Indicated mean-effective pressure instrument

Details Indicated mean-effective pressure instrument Indicated mean-effective pressure instrument

1977-09-29

1978-09-05

Ciarlante, Anthony V.

Measuring and testing

Vehicle drive train

Rear end

G01M 1500

Patent

active

041110412

ABSTRACT:
There is disclosed an apparatus for measuring indicated mean effective pressure (IMEP) of an internal combustion piston or rotary engine or of an external combustion engine such as a stirling engine. An optical shaft encoder measures crankshaft angle of the engine. Changes in volume with respect to changes in crankangle of one or more cylinders (dV/d.theta.) is determined either empirically or algebraically from engine geometry and stored in a memory. As the crank angle changes, dV/d.theta. is read from the memory and multiplied by chamber or cylinder pressure. The product (P dV/d.theta.) is then added to the total previously accumulated in the cycle. Each time .theta. changes by an amount equal to delta .theta., the process is repeated. At the end of each engine cycle, the total is equal to the IMEP value for that cycle.

REFERENCES:
patent: 2800014 (1957-07-01), Welch et al.
patent: 2817966 (1957-12-01), Wright et al.
patent: 3283569 (1966-11-01), King et al.
patent: 3815410 (1974-06-01), Brown et al.

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