In this paper we analyze the nonlinear dynamic be havior of an internal exhaust gas recirculation system based on the mean value model of an experimental en gine equipped with a camshaft phaser We develop a dynamic camshaft timing schedule that regulates the in ternal exhaust gas recirculation system while maintain ing transient engine torque response similar to an engine with zero exhaust gas ...

In this paper we analyze the nonlinear dynamic behavior of an internal exhaust gas recirculation system based on a mean-value model of an experimental automotive engine equipped with a camshaft phaser. We develop a control scheme that adjusts camshaft timing to reduce feedgas emissions while maintaining transient engine torque response similar to that of a conventional engine with zero exhaust ...

VarioCam technology allows adjustment of the camshaft angle and is set to provide optimum performance for each Porsche engine. For example, in the Boxster, the camshaft angle can be adjusted by as much as 40 degrees compared to the crankshaft, reducing charge cycle losses, improving power, fuel consumption and keeping exhaust emissions to a minimum. In the Cayenne, an adjustment of up to 25 deg...

Traditionally, cam-follower systems are designed by assuming a constant camshaft speed. Nevertheless, all cam-follower systems, especially high-speed systems, exhibit some camshaft speed fluctuation (despite the presence of a flywheel) which causes distorted follower motions and subsequent dynamical problems. The authors previously proposed two methods to overcome these problems: (i) the synthe...

During the first design stages in the production of a new after-market camshaft for racing applications, custom auto parts companies rely on experienced technicians to predict the best shape of the camshaft’s lobes. With nothing other than their eye to guide them, numerous iterations of the shape of the lobes were required before the proper combination was achieved. Using the engine rpm as the ...

This paper presents an investigation report of different components failure which affect the performance of an automobile engine. The premature breakage of a four cylinder diesel engine block, crankshaft, camshaft, crankshaft bearing, camshaft bush, engine oil pump was reported. It is found that the failure of each component having the same reason for its failure as reported from different plac...

Because the traditional camshaft measurement methods cannot be applied to injection pump cam, in order improve automation of camshaft, an accurate extraction method characteristic parameters cam profile is proposed this paper. In method, phase error optimization realized by angle precise rotation matching actual lift data. The Lagrangian polynomial interpolation algorithm based on moving window...

To increase the efficiency of a natural gas engine, use Miller camshaft was analysed. avoid decline in low-end torque and also transient response, pressure wave supercharger (Comprex™) compared to conventional single-stage turbocharger. The analyses for this conceptual comparison were performed experimentally, data then used run simulations driving cycles light commercial vehicles. A 49% result...