Title: Vacuum signal integrator

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Abstract: A Vacuum Signal Integrator (10) is typically employed for processing and combining multiple vacuum input signals into a single output signal within the environment of a truck or automobile. The integrator, in a typical application, would input vacuum signals representative of throttle position, RPM, altitude and coolant temperature and output a vacuum signal equivalent to the algebraic sum thereof to modulate a diesel EGR valve. Structurally, the integrator includes a housing (11) carrying several conventional vacuum motors (32, 34 and 36). Each vacuum motor applies a force to an idler bar (68) within the housing through reaction inserts (62, 94 and 96), which is representative of a monitored input signal. The individual forces collectively applied to the idler bar generate a resultant or moment force thereon which is linked to a conventional vacuum modulator valve (38) through a vent insert (118).

The housing is formed in an upper and lower section which are hinged about pin 24 and latched by snap-locks 18, 20 to close. The idler bar and modulator bar are mounted in the lower shell and certain of the vacuum motors are mounted on the upper shell.