Unlike current cylinder deactivation strategies that shut off a fixed number of cylinders, DSF makes dynamic firing decisions every 90 degrees of crank angle on a V8 (180 degrees on a 4 cylinder engine) based on how much torque is requested.
The result: the engine dynamically fires the optimal number of cylinders to maximize fuel economy while maintaining a smooth ride with commercial levels of noise and vibration.
What is DSF?
Creating an Engine to Order
DSF delivers a highly responsive approach to variable engine displacement. When more torque is required, the firing density (the ratio of cylinders actually fired to the maximum possible) increases. With less demand for torque, the firing density decreases. The DSF algorithm effectively creates an engine with optimal displacement for the torque required.
Non-DSF engines waste energy by closing the throttle to limit air intake, increasing pumping losses. DSF engines limit cylinder firings instead, reducing pumping losses and increasing efficiency.
Fuel Efficiency Without Compromise:
Passenger Comfort Guaranteed
DSF algorithms are developed to maintain a smooth ride for any amount of requested torque. Tula’s proprietary firing decision and control algorithms avoid generating noise and vibration (N&V) to give drivers the expected levels of refinement under all driving conditions.
How Dynamic Skip Fire (DSF) works
Tula’s proprietary and patented DSF technology modulates power output by dynamically deploying each engine cylinder event in real time.
DSF software and engine control algorithms create optimal fuel efficiency by individually firing cylinders to precisely match the driver’s request for torque. Because each combustion event is selected to allow optimal efficiency, DSF reduces fuel and CO2, and for diesel applications, NOx emissions. Tula’s proprietary firing decision and control algorithms avoid noise and vibration generation to give drivers expected levels of refinement under all driving conditions.
Applicable to Advanced Engine and Control Systems
DSF works synergistically with advanced engine designs, including Miller-cycle engines.
DSF will be able to anticipate acceleration and braking requirements algorithmically, adjusting engine torque to optimize fuel efficiency for Autonomous vehicles.
Forward-thinking car makers constantly seek greater fuel economy
Tula and DSF offer a cost-to-benefit ratio half of other new technologies.
Coupled with conventional and advanced technologies, Tula’s Dynamic Skip Fire (DSF) provides a clear path forward in optimizing the fuel consumption of the automotive fleet.