Showing papers by "J. N. Reddy published in 1978"
TL;DR: In this paper, two variational models of the primitive equations governing two-dimensional, viscous incompressible Stokes flows are studied and the existence and uniqueness of solutions to the associated variational problems are proved using the generalized Lax-Milgram theorem of Babuska.
29 citations
TL;DR: Finite element solutions of a number of one-dimensional linear and nonlinear integral equations arising in radiative heat transfer and boundarylayer theory are presented in this paper, where the authors also consider the non-nonsingular integral equation.
Abstract: Finite-element solutions of a number of one-dimensional linear and nonlinear (nonsingular) integral equations arising in radiative heat transfer and boundarylayer theory are presented.
21 citations
17 citations
Patent•
01 May 1978TL;DR: A pulse width computer for a fuel-injected internal combustion engine generates injector actuation control pulses, the widths of which increase with decreasing engine temperature as discussed by the authors, which are normally applied to control an injector drive circuit that, in turn, controls the duration of activation of one or more electromagnetically-actuated injectors in synchronization with the engine cycle.
Abstract: A pulse width computer for a fuel-injected internal combustion engine generates injector actuation control pulses, the widths of which increase with decreasing engine temperature. These actuation control pulses are normally applied to control an injector drive circuit that, in turn, controls the duration of activation of one or more electromagnetically-actuated injectors in synchronization with the engine cycle. During engine cranking operations, the widths of the injector actuation control pulses are also integrated on a capacitor to generate a voltage that is compared with a temperature dependent reference voltage selected to represent an incipient flood condition. When the capacitor voltage is detected as having increased to this reference voltage, the comparator causes an attenuation of the injector actuation control pulse. In one embodiment, the injector actuation control pulse is attenuated by being inhibited for the remainder of the cranking period after which the capacitor is suitably discharged. In another embodiment, the injector actuation control signal is inhibited until the capacitor is discharged at a predetermined rate to a level below the incipient flood level. And, in a third embodiment, the width of the injector actuation control signal is decreased by a one shot pulse the width of which varies with one or more engine parameters.
16 citations
Patent•
02 Jun 1978
TL;DR: In this article, the authors propose a multi-capteur de pression fonctions multiples, where the first capteur compensates the second capteur with a cote du second organe sensible.
Abstract: Capteur de pression a fonctions multiples. Capteur de pression comprenant un premier capteur engendrant un premier signal de pression et possedant un premier organe sensible et un moyen appliquant une premiere pression a un cote du premier organe sensible, un second capteur engendrant un second signal de pression et possedant un second organe sensible et un moyen appliquant une seconde pression a un cote du second organe sensible; un boitier ayant une chambre et supportant le premier et le second capteur avec les cotes opposes du premier et du second organe sensible exposes a la chambre, et cette derniere appliquant une troisieme pression aux cotes opposes du premier et du second organe sensible, et un circuit combinant le premier et le second signal de pression afin d'engendrer un troisieme signal de pression fonction du premier et du second signal de pression. Capteur applicable aux systemes electroniques de commande d'injection de combustible pour moteurs a explosion.
1 citations
TL;DR: In this paper, the application of automotive sensors to electronic control of the internal-combustion engine, with emphasis on sensor-signal characteristics and utilization, is described, and a number of control concepts realized with these sensors.
Abstract: This paper describes the application of automotive sensors to electronic control of the internal-combustion engine, with emphasis on sensor-signal characteristics and utilization. Manifold absolute pressure, crankshaft position, throttle position, temperature, and exhaust-gas recirculation are among parameters monitored to electronically regulate engine inputs. Also presented are a number of control concepts realized with these sensors.
1 citations