초록 ▼

The fuel supply control pulses of an internal combustion engine may be shortened or lengthened to provide operation of the engine at a definite fuel-air ratio. When operation takes place in a leaned-out region, the engine suffers dynamic instability, resulting in rapid fluctuations of the rotational

The fuel supply control pulses of an internal combustion engine may be shortened or lengthened to provide operation of the engine at a definite fuel-air ratio. When operation takes place in a leaned-out region, the engine suffers dynamic instability, resulting in rapid fluctuations of the rotational crankshaft velocity, superimposed on regular, periodic changes due to compression changes. The maximum and minimum crankshaft speeds are measured at two different locations of the angular path by passing markers in front of an inductive transducer. The output signals from this transducer are fed to a gating circuit which controls the counting modes of a digital counter which is also supplied with a clocking pulse train at a constant, high frequency. The gating circuit causes alternate upward and downward counting in the counter so that a net difference of counted pulses is formed after each two successive counting periods. This difference is stored until a particular piston of the engine has returned to the functional position it occupied during the first measurement. The measurement is repeated and the difference between the two measurements is compared. The result of this comparison forms a measure of engine roughness and is used for fuel control.

대표청구항 ▼

A process for obtaining a signal for controlling an internal combustion engine, said engine including a rotating crankshaft, and cyclically moving piston means, comprising the steps of: obtaining a first datum related to the speed of rotation of said crankshaft at a first angular position and obtain

A process for obtaining a signal for controlling an internal combustion engine, said engine including a rotating crankshaft, and cyclically moving piston means, comprising the steps of: obtaining a first datum related to the speed of rotation of said crankshaft at a first angular position and obtaining a second datum related to the speed of rotation of said crankshaft at a second angular position; forming and storing a first arithmetic difference between said first and second datum; repeating the step of obtaining a first and a second datum related to the speed of rotation of said crankshaft, during a subsequent revolution thereof, and at the same position of said piston means; forming a second arithmetic difference between the first and second datum obtained during said subsequent revolution of the crankshaft; comparing said first difference with said second difference and obtaining a result; comparing said result with a predetermined set-point value and obtaining a second result from which said signal for controlling the engine may be derived.