PACCAR has filed a patent for a variable geometry turbine (VGT) that includes an adjustable nozzle and a controller. The nozzle is calibrated during normal operation by adjusting it towards a closed position and monitoring the pre-turbine pressure. The patent aims to adjust the working range of the VGT based on varying operating conditions. GlobalData’s report on PACCAR gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on PACCAR, driving behavior monitoring was a key innovation area identified from patents. PACCAR's grant share as of September 2023 was 74%. Grant share is based on the ratio of number of grants to total number of patents.
Variable geometry turbine with adjustable nozzle for exhaust gas control
A recently filed patent (Publication Number: US20230313808A1) describes a variable geometry turbine (VGT) for use in internal combustion engines. The VGT includes an intake channel that receives exhaust gas from the engine, a rotor that extracts energy from the exhaust gas, and an adjustable nozzle that controls the flow of exhaust gas to the rotor. The nozzle can be adjusted between an open position, with a maximum cross-sectional area, and a closed position, with a minimum cross-sectional area. A nozzle actuator is used to control the position of the adjustable nozzle based on a demand from a controller.
In one claim, the controller is described as comparing the detected deflection point position to a stored deflection point position of a pre-calibrated VGT. This allows the controller to determine a deflection point position offset, which is then applied to the nozzle position demand. The deflection point position is detected by monitoring the second derivative of a filtered pre-turbine pressure sensor signal.
The controller is also responsible for controlling the nozzle actuator based on the measured pre-turbine pressure. The intake channel is designed to provide the exhaust gas to the rotor in a direction perpendicular to the rotor's axis of rotation. Additionally, the intake channel is formed as a volute that is coaxially aligned with the rotor.
The adjustable nozzle in the VGT can be made up of vanes that are rotatable to adjust the cross-sectional area of the nozzle orifice. The nozzle actuator is responsible for actuating these vanes. Alternatively, the adjustable nozzle can include a slidable cylinder that adjusts the cross-sectional area of the nozzle orifice by sliding towards an opposing wall of the intake channel. The nozzle actuator is then used to actuate the slidable cylinder.
The patent also claims the use of this variable geometry turbine in a commercial vehicle. Finally, a method for calibrating the VGT is described, which involves adjusting the cross-sectional area of the nozzle throat by moving the adjustable nozzle between its open and closed positions.
Overall, this patent describes a variable geometry turbine that allows for precise control of the flow of exhaust gas to a rotor, providing improved energy extraction from internal combustion engines. The use of a controller and various actuators ensures accurate adjustment of the nozzle position based on demand and measured parameters.
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