Methods and systems are provided for reducing bleed emissions and exhaust emissions from a vehicle that may be operated autonomously as well as part of a car-sharing model. A parking location of the vehicle is selected at the end of a vehicle event requested by an operator as a function of fuel system and evaporative emissions system variables such that the solar loading of the parking location enables reduced emissions. The parking location selection is further coordinated with the pick-up time and location of a subsequent vehicle event requested by another vehicle operator.

A method of operating a fuel injection system for a motor vehicle includes one or more of the following: operating a fuel injector to perform a fuel injection, the fuel injector being in fluid communication with a fuel rail; sampling a rail pressure in the fuel rail during the fuel injection; regulating the rail pressure at a desired injection pressure, P.sub.inj, to the fuel injector; measuring an overall leakage on variations of the rail pressure across an engine cycle for the motor vehicle and between two engine positions of an internal combustion engine for the motor vehicle; and restarting a new measurement cycle for a new pressure measurement target.

Methods and systems are provided for reducing release of undesired evaporative emissions to atmosphere for a hybrid vehicle. In one example, a method comprises locking a transmission of the vehicle in park until a request to override the locking is received at a controller of the vehicle, and conducting one or more routines related to reducing release of undesired evaporative emissions to atmosphere, where the one or more diagnostic routines rely on a vacuum derived from an engine of the vehicle combusting air and fuel while the transmission is locked in park. In this way, completion rates for conducting the one or more routines may be improved, and issues related to the release of undesired evaporative emissions to atmosphere may be reduced or avoided.

Systems, methods, and a computer readable medium are provided for monitoring and detecting a gas emission. Sensor data including gas concentration and wind data associated with a gas emission from an emission source is received from Near-Field and Far-Field sensors configured within a gas production and distribution environment. The sensor data can be provided as inputs to a Near-Field dispersion model to determine an emission rate associated with the gas emission and one or more source locations associated with the gas emission. The emission rate can be included in emission data and provided for output. Related apparatus, systems, techniques, and articles are also described.

A method that includes coupling an external, removable fuel pressurization system to a fuel system of a vehicle while the vehicle remains in a confined space. The fuel system of the vehicle is pressurized with the fuel pressurization system while the vehicle remains in the confined space and without activating an engine of the vehicle. Decay of pressure of the fuel system is monitored following pressurization of the fuel system, and one or more of a leak, or a replaceable component, of the fuel system of the vehicle is detected based on at least in part on the decay of pressure that are monitored.

A pressurized fuel injection system for an engine includes a pressure sensor in a low pressure rail, an electronic pressure regulator valve in flow communication with and downstream from the low pressure rail and in flow communication with and upstream from a fuel supply, and a controller configured to receive a pressure signal from the pressure sensor and to control the electronic pressure regulator valve in response to the pressure signal to maintain a target pressure in the low pressure rail.

The invention provides a system for ventilation of a crankcase (217) of an internal combustion engine, the system comprisingan air inlet guide (203, 212) adapted to guide air to at least one cylinder (220) of the engine,a closed circuit conduit (209) for guiding crankcase gas from the crankcase (217) to the air inlet guide (203, 212),wherein the system comprises gas detection means (2181, 2182, 2183) positioned in the air inlet guide (203, 212), for detecting crankcase gas in the air inlet guide.

This exhaust purification system includes: a pump disposed in an exhaust-side purge passage to supply air or purge gas purged from a canister to a catalyst; a three-way valve disposed upstream of the pump in the exhaust-side purge passage and configured to switch the exhaust-side purge passage between a communicating state allowing the pump to communicate with the canister and an atmosphere open state allowing the pump to communicate with the atmosphere; a flow control valve disposed downstream of the pump and configured to control a flow rate of air to be supplied to the catalyst; and a controller configured to, when a request to regenerate the catalyst occurs, control a purge valve, the pump, the three-way valve, and the flow control valve to supply, to the catalyst, purge gas purged from the canister and air by a necessary amount to burn particulates trapped in the catalyst.

A method for detecting continuous injection during the operation of an internal combustion engine with an injection system having a high-pressure accumulator for a fuel, whereina high pressure in the injection system is monitored as a function of time, whereinin order to detect continuous injection it is checked whether the high pressure has dropped by a predetermined continuous injection differential pressure value within a predetermined continuous injection time interval, whereinit is checked whether a reduction valve which connects the high-pressure accumulator to a fuel reservoir has been triggered, and whereincontinuous injection is detected ifa reduction valve has not been triggered in a predetermined checking time interval before the dropping of the high pressure, and ifthe high pressure has dropped by the predetermined continuous injection differential value amount within the predetermined continuous injection time interval.

The disclosed embodiments relate to a device for operating a tank ventilation system of an internal combustion engine. This device has a fuel tank, an activated carbon filter for collecting and buffering fuel vapors escaping from the fuel tank, a purge air pump and a control unit. The outlet of the purge air pump is connected to the intake tract of the internal combustion engine via a first tank venting valve and connected to the exhaust tract of the internal combustion engine via a second tank venting valve.