A method of exercising a generator includes detecting a temperature of the generator by a temperature sensor, if the temperature of the generator is above a predetermined temperature, activating, by a controller, a starter motor of the generator, and performing, by the controller, an exercise test, and if the temperature of the generator is below the predetermined temperature, not activating, by the controller, the starter motor.

Methods and systems for operating an engine with an electrically heated catalyst and an electrically driven compressor are described. In one example, the electrically driven compressor and the electrically heated catalyst are activated before an engine start so that vehicle emissions may be reduced more efficiently at engine starting and thereafter.

Methods and systems are provided for providing compression release during a stop/start event in an engine. In one example, a method includes: responsive to a request for a stop/start event in an engine with a continuously variable valve lift (CVVL) system including a compression release hydraulic valve actuator coupled to a valve of a first cylinder, determining a desired stop position of the engine; and prior to restarting the engine during the stop/start event, adjusting the compression release hydraulic valve actuator to open the valve during a compression stroke of the first cylinder. In this way, an amount of torque used to restart the engine may be reduced.

Systems and methods for operating a driveline of a hybrid vehicle are disclosed. In one example, output of an electric machine is adjusted after commanding reactivation of all engine cylinder valves that have been deactivated. The electric machine torque may counteract the engine producing torque that is greater than a requested torque due to high intake manifold pressure.

A method for operating an internal combustion engine with a system for supercharging that includes an exhaust turbocharger and an electrically driven charging device for dynamic assistance during build-up of boost pressure, with: determining a drive criterion of the charging device, establishing an initial quantity of the drive criterion; continuously determining a reduction factor for the drive criterion within a balance period; applying the reduction factor to the initial quantity of the drive criterion; and operating the charging device with the drive criterion reduced by the reduction factor.

A vehicle predictive control system based on big data includes: a vehicle terminal, which is installed in each of a plurality of vehicles, collecting status information related with an in-vehicle device in a corresponding vehicle to transmit the collected status information in real time, and transmitting problem occurrence information upon problem occurrence of the in-vehicle device; and a big data service provider classifying and storing the status information received from the vehicle terminal as big data, and obtaining a problem occurrence condition based on the status information to transmit information corresponding to the problem occurrence condition to the vehicle terminal when receiving the problem occurrence information of the in-vehicle device from the vehicle terminal of at least some vehicles among the plurality of vehicles.

Various methods and systems are provided for a method for a hybrid engine system. In one example, the method includes operating an electrical turbocharger to modify engine operating efficiency and to extend battery charge over a duration of a travel route based on a real-time status of the battery charge. The method allows fuel consumption to be decreased while meeting power demands of vehicle navigation.

A supplemental fuel system for a machine having a compression-ignition engine includes an air intake tube. The air intake tube has a first end configured to interface with an air cleaner of an air supply system that provides air to the compression-ignition engine, a second end configured to interface with a compressor of a turbocharger of the air supply system, and a sidewall extending between the first end and the second end. The sidewall includes a fuel interface configured to facilitate providing a supplemental fuel into the air intake tube to mix with the air upstream of the compressor of the turbocharger.

A method and system are provided for adjusting a speed of a turbocharger compressor using an electric motor in response to a relative substitution rate of first and second fuels in a multi-fuel engine.

A supplemental fuel system includes a fuel mixer having a nozzle and a stem. The nozzle is configured to be positioned within a conduit of an air supply system for an engine. The nozzle has a body defining a first inlet, an outlet, a passage extending from the first inlet to the outlet, and a second inlet positioned between the first inlet and the outlet. The body has a first cross-sectional dimension that is configured to be less than a second cross-sectional dimension of the conduit such that (i) a first portion of air flowing through the conduit flows through the passage and (ii) a second portion of the air flowing through the conduit flows around the nozzle. The stem has a first end that interfaces with the second inlet. The stem is configured to extend through a wall of the conduit.