Abstract: In order to make it possible to also mount an original exhaust system (10) substantially leading away from the internal combustion engine (2) below the output axle (7) parallel to the extension thereof in a test rig for internal combustion engines (2), the driving engine or load generator (4) is mounted in a suspended manner at a certain vertical distance from the pedestal (1) on a support arrangement (6) mounted thereon, with the input axle (8) being substantially aligned with the output axle (7) of the internal combustion engine (2) that is to be tested, whereby the space from below the interference contour (9) of the driving engine or load generator (4) to the pedestal remains free for the passage of the exhaust system (10).

Abstract: A method and a device for performing tests on an internal combustion engine or a structure which is associated with the engine by measuring output parameter values on at least one output shaft (3LF, 3RF) which is connected to the engine, is distinguished by producing a representation of variations in said output parameter values during operation of the engine, and evaluating the representation for determining an operating parameter value for the engine or the structure. The invention also concerns a dynamometer testing rig.

Abstract: A rotational testing system for a test article includes a rotational test stand. The rotational test stand includes a rotating element having a drive end capable of being mechanically coupled with the test article. The rotational testing system also includes a non-isolating torsional damper attached to the rotating element.

Abstract: An engine measurement device includes a detector for measuring individual pieces of time series data containing at least a speed and output torque of an engine in a transient state while the engine is being run in combustion by control of an engine control unit, a torque operation unit for calculating the engine torque on the basis of the time series data of the engine speed and the output torque, and a model operation unit for modeling the engine torque as functions of the engine speed and a fuel injection time. This model is used to calculate both a fuel torque generated by the combustion run of the engine and a mechanical loss torque or the difference between the engine torque and the fuel torque.

Abstract: A system and method for setting the slip of a torque converter for a plurality of selected engine speeds and transmission gears. The method includes populating a table off-line, typically using a dynamometer, with torque converter slips for a plurality of selected engine speeds and transmission gears. A speed sensor is used to measure vibrations transmitted through the torque converter to the driveline of the vehicle. The sensor signal is sent to an analyzing system where it is converted to the frequency domain. A separate minimum slip value for each selected engine speed and transmission gear is stored in a table so that during vehicle operation, a controller will instruct the torque converter clutch to set the desired converter slip for the current engine speed and transmission gear provided for a particular throttle position and/or engine torque.

Abstract: A testing apparatus that is used for measuring a vehicle's parasitic loss and overall, loaded efficiency utilizes an external electric drive motor, as an input, connected to the engine crankshaft of the vehicle and dynamometers connected to each driving wheel hub, to measure output at the wheels. Although its wheels with tires are removed, the vehicle remains largely intact and rests upon vehicle supports, which are mounted to a track system under the vehicle. The track system permits the drive motor and dynamometers to adjust and accommodate any vehicle for efficiency analysis. A computer monitors the driving motor input and output at the dynamometers to calculate efficiency.

Abstract: In a hybrid vehicle, first, an engine is locked by an engine shaft locking mechanism. A first motor is operated by torque control and a second motor is operated by number-of-revolutions control. Torque for controlling the second motor in this state is obtained. Based on the obtained control torque, whether the first motor is normal is checked. Successively, the second motor is operated by the torque control and the first motor is operated by the number-of-revolutions control to check whether the second motor is normal in a similar manner.

Abstract: An engine test system includes a base constructed and arranged to reside at a fixed location. The system further includes an engine support member constructed and arranged to concurrently support an engine and move relative to the base. The system further includes a linear transducer having (i) a first portion supported by the base, (ii) a second portion supported by the engine support member, and (iii) a circuit adjacent the first and second portions. The circuit is constructed and arranged to provide a linear transducer signal identifying an amount of linear compression and/or tension between the engine support member and the base along a predefined direction. When the linear transducer resides at a break in station, such an embodiment provides a simple, low cost mechanism which is capable of providing a horsepower measurement for every engine passing through the break in station.