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5 results about "Variable-geometry turbocharger" patented technology
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Variable-geometry turbochargers (VGTs), (also known as variable nozzle turbines/VNTs), are a family of turbochargers, usually designed to allow the effective aspect ratio (A:R) of the turbo to be altered as conditions change. This is done because optimum aspect ratio at low engine speeds is very different from that at high engine speeds. If the aspect ratio is too large, the turbo will fail to create boost at low speeds; if the aspect ratio is too small, the turbo will choke the engine at high speeds, leading to high exhaust manifold pressures, high pumping losses, and ultimately lower power output. By altering the geometry of the turbine housing as the engine accelerates, the turbo's aspect ratio can be maintained at its optimum. Because of this, VGTs have a minimal amount of lag, have a low boost threshold, and are very efficient at higher engine speeds. VGTs do not require a wastegate.
Exhaust temperature control
PendingCN122014441AElectrical controlInternal combustion piston enginesTemperature controlPtru catalyst
A vehicle engine adapted to control an exhaust gas temperature (EGT) at a catalyst inlet includes an EGT sensor in communication with a system controller and adapted to measure the exhaust gas temperature at the catalyst inlet, the system controller being adapted to compare the measured EGT to a target EGT and, when the measured EGT is greater than the target EGT, to determine that the catalyst inlet is an exhaust gas temperature at the catalyst inlet. Gas exchange within cylinders within the engine is limited during an intake stroke, and turbine efficiency of a variable geometry turbocharger of the engine is increased by increasing boost from the variable geometry turbocharger.
Owner:GM GLOBAL TECHNOLOGY OPERATIONS LLC
EXHAUST GAS TEMPERATURE CONTROL
PendingDE102024139855A1Electrical controlInternal combustion piston enginesTemperature controlExhaust fumes
A vehicle engine designed to control the exhaust gas temperature (EGT) at a catalyst inlet includes an EGT sensor that communicates with a system controller and is designed to measure the exhaust gas temperature at the catalyst inlet, the system controller being designed to compare the measured EGT with a target EGT and then, if the measured EGT is greater than the target EGT, to limit the gas exchange in a cylinder in the engine during an intake stroke and to increase the turbine efficiency of a variable geometry turbocharger of the engine by increasing the pressure boost from the variable geometry turbocharger.
Owner:GM GLOBAL TECHNOLOGY OPERATIONS LLC
COMBUSTION ENGINE DIAGNOSTIC DEVICE
ActiveDE112019004847B4Electrical controlInternal combustion piston enginesControl engineeringControl cell
Diagnostic device for an internal combustion engine, wherein the internal combustion engine includes a variable geometry turbocharger and wherein the turbocharger includes a variable vane, a linkage mechanism configured to operate the variable vane, and an actuator configured to drive the linkage mechanism, the diagnostic device includes the following: a control unit configured to control the opening degree of the variable blade by controlling the actuator, wherein the control unit determines that an abnormality has occurred in the connection mechanism of the turbocharger if an operating time of the internal combustion engine in a predetermined operating range exceeds a predetermined upper limit and a differential pressure between a target boost pressure, which is determined according to an operating condition of the internal combustion engine, and an actual boost pressure exceeds a predetermined upper limit.
Owner:ISUZU MOTORS LTD
Variable geometry turbocharger (VGT) durability by avoiding excessive force on one or more components of the VGT
ActiveUS12540571B2Electrical controlInternal combustion piston enginesControl theoryMechanical engineering
In some implementations, a controller of a machine may identify an expansion ratio associated with a variable geometry turbocharger (VGT) of the machine. The controller may determine, based on the expansion ratio, wear-reduction information that indicates a force-reduction threshold position of the VGT. The controller may select, based on the wear-reduction information and performance information indicating a desired position of the VGT, an optimized position of the VGT. The controller may cause the VGT to be adjusted to the optimized position. In this way, the controller causes the VGT to operate within a force-related wear-reduction operating range (e.g., that causes the VGT to avoid excessive force being exerted on one or more components of the VGT 214), which improves a durability of the VGT.
Owner:CATERPILLAR INC
Method for improving performance of heavy diesel H2 dual-fuel engine through engine system optimization
A hydrogen-diesel dual fuel engine (100) includes an engine block (102) having a cylinder (104) equipped with at least two hydrogen fuel injectors (118) and a piston. An air treatment system of an engine (100) includes an intake manifold (114), an intake pipe (107), an exhaust pipe (122), a variable geometry turbocharger (108), and an exhaust gas recirculation system (126) configured to recirculate exhaust gas from the exhaust pipe (122) to the intake manifold (114). A two-stage camshaft of an engine (100) is configured with an air handling system for exhaust gas reintake and delayed intake valve closing, and a port fuel injector system (116) provides hydrogen to at least two hydrogen fuel injectors (118). The engine (100) further includes a diesel injector (305), a common rail fuel injection system (120), a plurality of sensors (150), and a controller (170) for controlling operation of the hydrogen-diesel dual fuel engine (100).
Owner:SAUDI ARABIAN OIL CO