Apparatus for damping bounce oscillations in an internal combust

Details Apparatus for damping bounce oscillations in an internal combust Apparatus for damping bounce oscillations in an internal combust

1980-02-15

1982-08-24

Lall, P. S.

Internal-combustion engines

Charge forming device

Including cylinder pressure or temperature responsive means

123436, 73 35, F02B 4700

Patent

active

043455590

ABSTRACT:
An apparatus for damping bounce-induced oscillations in an internal combustion engine having a fuel metering control for supplying fuel to the engine in accordance with various operational signals, which includes an engine speed sensor for generating an rpm signal proportional to the engine rpm, a signal differentiation circuit for producing an rpm differential signal from the rpm signal, and a phase-shifting circuit, connected to receive the rpm differential signal, for supplying to the fuel metering control a bounce damping signal which is proportional to the rpm differential signal and which is phase-displaced with respect to the rpm differential signal so that the fuel metering control supplies fuel to the engine to countercontrol the bounce-induced oscillations of the engine. In a preferred embodiment, the phase-shifting circuit includes a controllable dead time element for varying the phase displacement in accordance with the bounce frequency so as to compensate for the total system transit time of the apparatus, to thus effect countercontrolling of the bounce oscillations which is correctly phased and correct in frequency.

REFERENCES:
patent: 3757570 (1973-09-01), Cowley et al.
patent: 3789816 (1974-02-01), Taplin et al.
patent: 4044234 (1977-08-01), Frobenius et al.
patent: 4169371 (1979-10-01), Witschi et al.
patent: 4197767 (1980-04-01), Leung

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