CAMPRO

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CAMPROCam Profile (Proton engine)
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Advances to the BF200, BF225, and BF250 include the Honda VTEC (valve timing and lift electronic control) system, which uses mild cam profile to operate intake valves at low rpm, then engages a high-output cam profile for higher-rpm operation.
Specific valves and springs combined with a new cam profile give this engine a more aggressive, racing character.
For example, a closed-form modified trapezoidal function with adjustable positive and negative acceleration is proposed in order to design cam motion function (Flockers, 2012); the cam profile designed is adequate for applications in which there are various dwells or for high speed cams in which the follower acceleration has to be controlled.
The X15 Performance and Efficiency Series bring an innovative approach to duty-cycle optimization, they add, underscoring how the new platform "carries forward the best-in-class attributes of the ISX15 with the implementation of an optimized compression ratio, air handling system and cam profile to increase both fuel efficiency and performance capability."
Table 1: Development of cam profile Description Inlet cam Angle Existing cam data Inlet valve opening 44.63[degrees] Dwell 14.63[degrees] Inlet valve closing 45.36[degrees] Modified cam data Inlet valve opening 44.63[degrees] Dwell 14.63[degrees] Inlet valve closing 45.36[degrees] Description Exhaust Cam Angle Existing cam data Exhaust valve opening 43.9[degrees] Dwell 20.48[degrees] Exhaust valve closing 42.43[degrees] Modified cam data Exhaust valve opening 43.9[degrees] Dwell 20.48[degrees] Exhaust valve closing 21.21[degrees] 4.1 Design of Exhaust Cam:
Basically, the second and third cylinders of this four-pot unit are shifted to a cam profile which doesn't activate the valves under low and intermediate loads and when coasting.
On this installation, the "fuel mixture cam profile was erroneous." Fuel flow rate increased normally from idle cutoff to approx 80 percent of mixture-lever range of motion where fuel flow is at maximum.