To provide a dynamometer control device whereby excitation control can be performed so that a resonance phenomenon does not occur even when the moment of inertia of an engine is unknown. A dynamometer control device 6 is provided with an excitation signal generating unit 61 for generating a randomly or periodically fluctuating excitation signal, a speed controller 62 for generating an input signal to a dynamometer whereby a dynamo rotation speed matches a predetermined dynamo command rotation speed, a shaft torque compensator 64 for generating an input signal to the dynamometer whereby vibration of a shaft for connecting an engine and the dynamometer is suppressed using the detection value of a shaft torque sensor, and an adder 65 for generating a torque electric current command signal by adding the input signals generated by the speed controller 62 and the shaft torque compensator 64 to the excitation signal.

The present invention relates to A power margin indicator device constituting a first limitation indicator for a rotorcraft, for providing a pilot of said rotorcraft with information about a power margin available on at least one engine and a main power transmission gearbox of said rotorcraft as a function of flying conditions, said device comprising: input means for collecting input data corresponding various operating parameters of said at least one engine and of said MGB; calculation means connected to said input means, said calculation means serving to determine a collective pitch margin for the blades of a rotor of said rotorcraft; and display means presenting said collective pitch margin.

Techniques are described for determining an amount of fuel that is consumed by the body components of a vehicle, based at least partly on sensor data describing the operations of the body components and/or the location of the vehicle. A vehicle is equipped with a body that has any suitable number of body components that perform operations not directly associated with the translational movement of the vehicle from one location to another. Fuel is consumed to provide power (e.g., through power take off) to operate the body components. The vehicle includes sensor device(s) configured to sense the operations of the body components and generate sensor data that describes the operations of the body components. The sensor data is analyzed to determine an amount of fuel that is consumed to power the operations of the body components.

The invention concerns a test kit comprising a testing program programmed to control an internal combustion engine for testing the internal combustion engine with the engine kept at a fixed load condition, provided with a test module programmed execute a sequence of individual cylinder tests, wherein the test module comprises first computer code for measuring, in each cylinder test, a first engine performance value and further comprises second computer code for providing an amount of fuel to one cylinder under test to differ from an amount of fuel provided to the rest of the plurality of cylinders; and a further test module programmed to measure, in an idle period between subsequent individual cylinder tests of said sequence of individual cylinder tests, a second engine performance value; and said further test module comprising third computer code to discard at least some of the individual cylinder tests if the second engine performance measured by the further test module value passes a threshold.

Techniques are described for determining an amount of fuel that is consumed by the body components of a vehicle, based at least partly on sensor data describing the operations of the body components and/or the location of the vehicle. A vehicle is equipped with a body that has any suitable number of body components that perform operations not directly associated with the translational movement of the vehicle from one location to another. Fuel is consumed to provide power (e.g., through power take off) to operate the body components. The vehicle includes sensor device(s) configured to sense the operations of the body components and generate sensor data that describes the operations of the body components. The sensor data is analyzed to determine an amount of fuel that is consumed to power the operations of the body components.

In a test run, in order to easily provide a high-quality propulsion torque of a torque generator based on the partially low-quality measured variables available on the test bench, it is foreseen that an inner torque (M.sub.i) of the torque generator (D) is measured and based on the measured inner torque (M.sub.i), from an equation of motion, including the measured inner torque (M.sub.i), a dynamic torque (M.sub.dyn) and a shaft torque (M.sub.w) measured on the output shaft of the torque generator (D), a correction torque ({circumflex over (M)}.sub.cor) is estimated, and from the estimated correction torque ({circumflex over (M)}.sub.cor) and the measured inner torque (M.sub.i), the propulsion torque (M.sub.v) according to the relation M.sub.v={circumflex over (M)}.sub.cor+M.sub.i is computed.

There is a demand for enhancement of operability when a change of combination of rollers of a chassis dynamometer and the dynamometer is set depending upon a vehicle type of a test vehicle. A status indicating function block that indicates an equipment construction is disposed in a main menu display area that is provided on a console. With this arrangement, a current test status can be recognized. Further, a vehicle type selection window calling function block is disposed in a mode setting function button group in the main menu display area. A vehicle type selection window called by the vehicle type selection window calling function block includes a roller selection section to select rollers corresponding to the test vehicle, a setting display section that indicates a current setting equipment construction, and a setting display section that indicates a setting equipment construction during change of the setting.

A test method for a vehicle powertrain includes, during a first test in which dynamic engine torque from a powertrain drives a vehicle on a road, recording throttle position or accelerator pedal position to define a throttle schedule, and recording engine speed to define an engine speed schedule. The test method further includes, during a second test of a vehicle engine, controlling a dynamometer and the vehicle engine according to the engine speed schedule and throttle schedule to reproduce the dynamic engine torque.

An ion current detection circuit is for detecting an ion current flowing through a spark plug for an internal combustion engine. A detection terminal is to be electrically connected to the spark plug. A reference potential is to be supplied to a reference terminal. At least one protection diode is provided between the detection terminal and the reference terminal. A current detection unit causes a detection current to flow between the detection terminal and the at least one protection diode. A current compensation unit causes a compensation current to flow between the detection terminal and the at least one protection diode.

A system monitors the health of a helicopter, and includes a device for determining a change of state of the engine and is configured to collect data measured by engine and external conditions sensors during a stable flight phase and to process the measured data.