Abstract:
Methods and systems are provided for increasing EGR delivered to an engine. In one example, a method may include determining an EVO timing set point and an external EGR setpoint in parallel, based on an inverse model. The EVO timing may be adjusted based on a combination of the EVO timing setpoint and an EGR cylinder balancing feedback loop, thereby varying internal EGR to the engine to supplement external EGR.
Abstract:
Methods and systems are provided for a vehicle wirelessly communicating with a central server. In one example, a method may include monitoring faults and sending engine conditions along with driver inputs to the central server for processing.
Abstract:
Methods and systems are provided for a vehicle engine including a turbocharger coupled to a hydraulic pump and hydraulic accumulator. In one example, a method may include, in response to the vehicle coming to a stop, supplying pressure to a hydraulic braking system of the vehicle from the accumulator coupled to a hydraulic pump coupled to a shaft of a turbocharger of an engine installed in the vehicle, and automatically shutting down the engine while the vehicle is stopped.
Abstract:
Methods and systems are provided for pressure control in a boosted engine system. A variable geometry turbine (VGT) geometry, and/or wastegate (WG), and/or an exhaust gas recirculation (EGR) valve opening is adjusted at least based on a difference between the exhaust pressure and an intake pressure in order to reduce the difference between exhaust and intake manifold pressures, thereby reducing pumping work losses.
Abstract:
Methods for controlling a glow plug temperature in a diesel engine are herein described. In one example, a controller may adjust a first phase voltage coupled to the glow plug in relation to a parameter associated with engine start time, and couple a lower second phase voltage to the glow plug in order to control the cylinder temperature and thereby the engine start time. In one particular example, the reduced second phase voltage allows the operating cycle push phase to be extended, which increases glow plug durability and further allows for the useful life of the glow plug to be extended.
Abstract:
Embodiments for controlling condensate in an engine heat exchanger are disclosed. In one example, a method for an engine comprises increasing exhaust gas recirculation (EGR) flow responsive to condensation in an EGR cooler. In this way, condensate in the EGR cooler may be controlled via modulation of EGR flow.
Abstract:
A method for an engine may comprise, in response to an EGR valve closing, determining an EGR oxygen content, and purging an EGR system when the EGR oxygen content is less than a threshold oxygen content.
Abstract:
A method for operating a turbocharged engine is disclosed. In one example, during a first condition an engine operation is adjusted in response to a turbocharger expansion ratio exceeding a first limit and during a second condition an engine operation is adjusted in response to the turbocharger expansion ratio exceeding a second limit that differs from the first limit. Degradation of the engine may be reduced under some engine operating conditions by adjusting engine operation in response to the turbocharger expansion ratio.
Abstract:
Methods for controlling a glow plug temperature in a diesel engine are herein described. In one example, a controller may adjust a first phase voltage coupled to the glow plug in relation to a parameter associated with engine start time, and couple a lower second phase voltage to the glow plug in order to control the cylinder temperature and thereby the engine start time. In one particular example, the reduced second phase voltage allows the operating cycle push phase to be extended, which increases glow plug durability and further allows for the useful life of the glow plug to be extended.
Abstract:
The disclosure relates to a method and an observer for determining the exhaust manifold temperature in a turbocharged engine upstream of the turbine. In one example, a method for determining an exhaust manifold temperature in a turbocharged engine, said engine including a turbocharger and a turbine and said exhaust manifold temperature including a temperature upstream of the turbine, said method comprises estimating a value of the exhaust manifold temperature based on a model, measuring a temperature downstream of the turbine, and correcting the value of the exhaust manifold temperature based on said measurement.