In an engine test apparatus of a type to stop a carriage carrying an engine, by pressing a wheel of the carriage to a rail, the wheel and rail may be damaged if the wheel is pressed strongly. An engine test apparatus 1 is arranged to perform an engine performance test by moving a carriage 2 carrying an engine, along a rail 3, to the position of a dynamometer. Carriage 2 comprises a base 11 supporting the engine, casters 12˜45 attached to base 11, and a fixing portion 17 to position and fix base 11 on the rail. Casters 12˜15 include a spring 19 to be compressed when the base is fixed by the fixing portion.

In an engine test apparatus of a type to stop a carriage carrying an engine, by pressing a wheel of the carriage to a rail, the wheel and rail may be damaged if the wheel is pressed strongly. An engine test apparatus 1 is arranged to perform an engine performance test by moving a carriage 2 carrying an engine, along a rail 3, to the position of a dynamometer. Carriage 2 comprises a base 11 supporting the engine, casters 12˜45 attached to base 11, and a fixing portion 17 to position and fix base 11 on the rail. Casters 12˜15 include a spring 19 to be compressed when the base is fixed by the fixing portion.

A device for measuring surface temperature of a turbine blade based on a rotatable prism includes a probe, a prism rotating apparatus and an optical focusing apparatus. The prism rotating apparatus and the optical focusing apparatus are located inside the probe. The probe includes a probe outer casing, a probe inner casing, a water-cooled casing pipe, a sapphire window piece, a quartz prism, a light pipe, a collimating lens, a focusing lens and an infrared array detector. The prism rotating apparatus includes a rotary motor, a worm, a gear and a prism rotary table, the rotary motor rotates to drive the prism rotary table to rotate. The optical focusing apparatus includes a telescopic motor, a coupler, a lead screw and a drive rod, the telescopic motor rotates to drive the lead screw, so as to further drive the drive rod to move along the slot.

A device for measuring surface temperature of a turbine blade based on a rotatable prism includes a probe, a prism rotating apparatus and an optical focusing apparatus. The prism rotating apparatus and the optical focusing apparatus are located inside the probe. The probe includes a probe outer casing, a probe inner casing, a water-cooled casing pipe, a sapphire window piece, a quartz prism, a light pipe, a collimating lens, a focusing lens and an infrared array detector. The prism rotating apparatus includes a rotary motor, a worm, a gear and a prism rotary table, the rotary motor rotates to drive the prism rotary table to rotate. The optical focusing apparatus includes a telescopic motor, a coupler, a lead screw and a drive rod, the telescopic motor rotates to drive the lead screw, so as to further drive the drive rod to move along the slot.

A system for determining a performance status of an exhaust aftertreatment system may include determining an ammonia-to-nitrogen ratio using a sample ammonia input value and a sample NO.sub.x input value. An actual NO.sub.x input value and an actual ammonia input value can be received. An emission value from may be received from a first sensor. A NO.sub.x emission estimate, an ammonia slip estimate, and an optimal ammonia storage value for a selective catalytic reduction may be determined using an iterative inefficiency calculation based, at least in part, on the actual NO.sub.x input value, the actual ammonia input value, and the ammonia-to-nitrogen ratio; and the NO.sub.x emission estimate, the ammonia slip estimate, and the optimal ammonia storage value may be outputted to a diagnostic system.

A method and system to arrange combustion air for a combustion engine or cooling air for an electric motor that are situated in warm indoor space. A started combustion engine or a combustion engine to be started or the air intake equipment of an electric motor has in immediate closeness at least one air intake box where there is connected or will be connected an air channel that reaches the outdoor space and then the outdoor air flows through the air channel to the air intake box and further to the engine air intake equipment. The aspects of the disclosed embodiments are used in the air intake of the lorries, trailer trucks and busses and also power tools and the cooling air of the electric motors.

A method and system to arrange combustion air for a combustion engine or cooling air for an electric motor that are situated in warm indoor space. A started combustion engine or a combustion engine to be started or the air intake equipment of an electric motor has in immediate closeness at least one air intake box where there is connected or will be connected an air channel that reaches the outdoor space and then the outdoor air flows through the air channel to the air intake box and further to the engine air intake equipment. The aspects of the disclosed embodiments are used in the air intake of the lorries, trailer trucks and busses and also power tools and the cooling air of the electric motors.

An exhaust gas analysis system is adapted to include an exhaust gas circulation line through which exhaust gas flows, an exhaust gas collection line adapted to collect the exhaust gas from the exhaust gas circulation line and introduce the collected exhaust gas into an exhaust gas analysis device, a continuous analysis line adapted to, separately from the diluted exhaust gas collection line, collect the exhaust gas from the exhaust gas circulation line for continuous analysis, a continuous analyzer provided in the continuous analysis line, and an information processing unit adapted to, on the basis of an analysis result by the continuous analyzer at the time of the collection into the exhaust gas analysis device, determine whether a measurement result of the exhaust gas introduced into the exhaust gas analysis device falls within a preset range, or determine a measurement range used to measure the exhaust gas introduced into the exhaust gas analysis device.

The present disclosure provides an air flow rate measuring including a casing and a sensor. The casing includes a main-bypass passage that defines an inlet and an outlet, a sub-bypass passage that branches off from the main-bypass passage at a branching area, and a guiding wall that changes, at a position upstream of the branching area, a flow direction of the passing air taken in from the inlet. The inlet and the guiding wall are arranged in an arranging direction along a flow direction of the intake air in the duct. The guiding wall includes an inlet side surface that faces the inlet and is not perpendicular to the arranging direction.

The method for testing the integrity of a seal of a cavity in an engine includes providing a sealed test tank external to the cavity, the test tank having an internal volume that is particularly selected, as described herein. A pressure differential is generated between the test tank and the cavity, by creating an initial test pressure within the test tank that is different than an ambient pressure inside the cavity. Gas flow between the test tank and the cavity is then permitted, and a change in pressure within the test tank is measured, as is a test time required for the pressure inside the test tank to reach a reference pressure. The measured test time is compared with a predetermined reference time, and the integrity of the seal may be confirmed when the test time is greater than or equal to the reference time.