Method for operating an arrangement for using waste heat of an internal combustion engine, wherein the internal combustion engine has an exhaust gas duct and the arrangement for using waste heat has a circuit conveying a working medium. In the circuit are arranged, in the flow direction of the working medium, a pump, at least one evaporator, an expansion machine and a condenser. The at least one evaporator is also arranged in the exhaust gas duct, wherein in the at least one evaporator an exhaust gas expelled from the internal combustion engine is used as a heat source, and thus the working medium is evaporated in the evaporator. The method according to the invention detects, inside the at least one evaporator, a leakage of the working medium into the exhaust gas duct.

Systems and methods utilize a controller configured to perform a diagnostic routine for a combustion seal provided between a gasoline direct injection (GDI) fuel injector and a combustion chamber of a cylinder of a GDI engine. The diagnostic routine comprises determining one of (i) a period for the injector coil current to reach a peak current and (ii) a resistance of the injector coil while the injector coil current is saturated, determining whether the determined period or the determined injector coil resistance is greater than a respective threshold indicative of a predetermined temperature of the injector coil, and when the determined period or the determined injector coil resistance is greater than its respective threshold, detecting a combustion seal leak fault. Based on the combustion seal leak fault, the controller may modify operation of the engine to prevent potential heat damage to the engine.

Methods and systems are provided for drying engine cylinders in situ responsive to engine flooding. In one example, a laser ignition device is operated in each engine cylinder, sequentially, while the cylinder is parked with an intake valve closed and an exhaust valve open. The heat generated by the laser operation vaporizes liquid fuel in the cylinder, which flows out of the cylinder via the open exhaust valve, expediting cylinder drying.

Methods and systems for evaluating whether or not a fuel amount that is greater than a threshold has been release to an engine via fuel injectors when the fuel injectors are commanded off are presented. In one example, an oxygen sensor is activated and engine cranking is prevented until a pumping current of the oxygen sensor is proportionate to a concentration of oxygen sensed via the oxygen sensor so that released fuel may be observed during engine starting.

A fuel vapor purge system includes: a fuel tank; a canister; a passage component that defines an intake passage of an internal-combustion engine; a purge pump pumping vapor fuel; and a valve device having a valve object, a main part having an internal passage, an inflow port through which the vapor fuel pumped from the canister flows into the main part, an outflow port connected with the inflow port through the internal passage and being opened to the intake passage, and a leak port connected with the inflow port through the internal passage and being opened to outside of the main part. The leak port has a leak preventive structure which prevents the vapor fuel from leaking to outside when the valve device is attached to the passage component such that the vapor fuel is able to flow into the intake passage.

Methods and systems are provided for drying engine cylinders in situ responsive to engine flooding. In one example, a laser ignition device is operated in each engine cylinder, sequentially, while the cylinder is parked with an intake valve closed and an exhaust valve open. The heat generated by the laser operation vaporizes liquid fuel in the cylinder, which flows out of the cylinder via the open exhaust valve, expediting cylinder drying.

A transport refrigeration system having: a first engine (26) configured to power a refrigeration unit (22); a first fuel tank (330) fluidly connected to the first engine through a first fuel line (332); a first shut off valve (450) located within the first fuel line proximate the first fuel tank; a second shut off valve (72) located within the first fuel line proximate the first engine; a sensor system (80) configured to detect at least one of a crash of the transport refrigeration system, a fuel leak in the first fuel line, and an engine stall in the first engine; and a controller (30) configured to close the first shutoff valve and the second shutoff valve when the sensor system detects at least one of a crash of the transport refrigeration system, a fuel leak in the first fuel line, and an engine stall in the first engine.

A fugitive gas detection system is provided. The system includes a cloud service, a plurality of reach-based components, a plurality of wireless gas sensors. The reach-based components comprise backhauls and gateways. The wireless gas sensors are acted as nodes to acquire sensor data in a local mesh network and the nodes are connected to the cloud service through the reach-based components, one node can transmit the sensor data to other sensor nodes of the local mesh network. The system measures flammable gas levels with speed, economy and accuracy.

Methods and systems for evaluating whether or not a fuel amount that is greater than a threshold has been release to an engine via fuel injectors when the fuel injectors are commanded off are presented. In one example, an oxygen sensor is activated and engine cranking is prevented until a pumping current of the oxygen sensor is proportionate to a concentration of oxygen sensed via the oxygen sensor so that released fuel may be observed during engine starting.

Methods and systems are provided for diagnosing a vehicle fuel system for a presence or absence of undesired evaporative emissions. In one example, a method comprises conducting a test for undesired evaporative emissions stemming from a fuel system of a vehicle via in a first operating mode, evacuating the fuel system to a variable vacuum level through an entirety of a fuel vapor canister configured to capture and store fuel vapors, and in a second operating mode, evacuating the fuel system to the variable vacuum level through a portion of the fuel vapor canister. In this way, the diagnostic may be conducted in an environmentally friendly fashion, where analysis of a bleed-up portion of the test is not impacted by fuel volatility at the time of the diagnostic.