Control of variable geometry turbochargers
AssigneeCaterpillar Inc.
InventorsDerek A. Tanis, Kevin Weiss
Life of this patent
Estimating the term…
Abstract
Systems, methods, and computer-program products can pertain to a variable geometry turbocharger (VGT) control and can comprise: determining using a processor, whether a coast flag is set indicating that a work machine is coasting; holding the VGT at a current vane configuration as long as the coast flag is set; and returning the VGT to normal operation thereof upon a determination that the coast flag is reset.
Claims17
A work machine comprising:
- an internal combustion engine;
- a variable geometry turbocharger (VGT) having displaceable vanes;
- and
- control circuitry constructed to:
- determine the work machine is coasting without use of look-ahead data,
- assert a coasting flag upon a determination that a gear threshold, a throttle threshold, a grade threshold, and a speed threshold have been met, and
- output control signaling to maintain a current VGT vane configuration as long as the coasting flag is asserted.
An internal combustion engine of a work machine comprising:
- a variable geometry turbocharger (VGT) constructed to modulate intake air density of the internal combustion engine;
- electronic machine control circuitry constructed to assert a coasting flag upon a determination that the work machine is coasting;
- and
- VGT control circuitry constructed to maintain a current VGT vane configuration while the coasting flag is asserted and through a debounce period subsequent to the coasting flag being reset.
An internal combustion engine of a work machine comprising:
- a variable geometry turbocharger (VGT) constructed to modulate intake air density of the internal combustion engine;
- electronic machine control circuitry constructed to assert a coasting flag upon a determination that the work machine is coasting,
- the coasting flag being asserted upon a determination that a gear threshold, a throttle threshold, a grade threshold, and a speed threshold have been met;
- and
- VGT control circuitry constructed to maintain a current VGT vane configuration as long as the coasting flag is asserted.
A method of variable geometry turbocharger (VGT) control comprising:
- determining, in real time, using a processor, whether a coast flag is set indicating that a work machine is coasting;
- holding the VGT at a current vane configuration as long as the coast flag is set;
- and
- returning the VGT to normal operation thereof upon a determination that the coast flag is reset, wherein returning the VGT to normal operation includes:
- holding the current vane configuration through a debounce period;
- and
- returning the VGT to normal operation subsequent to the debounce period.
Dependencies are inferred from the claim text.