Rototest International Ab

Other

Christian Engström

Jonny Färnlund

Nils G Engström

A dynamometer test unit configured for use in a vehicle dynamometer system for dynamometer testing of a vehicle, the dynamometer test unit being configured to be connected to a wheel shaft of a vehicle, the dynamometer test unit comprising a power source having a stator and a rotor and being configured to, during testing, apply torque to a wheel shaft of the vehicle being tested, the power source being carried by a stator support, the stator being journaled in relation to the stator support, the dynamometer test unit further comprising means for measuring torque comprising an elastic strip, wherein the elastic strip connects the stator to the stator support, thereby restraining relative rotational movement between stator and stator support, and configured to transfer force between the stator and stator support, the elastic strip being firmly secured in a manner such that it is subjected to homogenous tensile prestress in a longitudinal direction of the elastic strip.

Method and apparatus for dynamometer testing of a motor vehicle

A method for use in dynamometer testing of a vehicle having a steering mechanism for changing steering angle of at a wheel hub connected to a first wheel shaft is provided. The method includes to apply a torque to the first wheel shaft using a first controllable dynamometer power source of a vehicle dynamometer test unit being rigidly connected to the wheel hub. A change of steering angle of the wheel hub rotates the rigidly connected first dynamometer test unit. An external force acting on the dynamometer test unit is applied to influence the force required by the vehicle steering mechanism to change steering angle of the wheel hub when changing steering angle of the wheel hub.

Method and system for use in dynamometer testing of a motor vehicle

A vehicle dynamometer system for dynamometer testing of a vehicle, comprises at least one dynamometer test unit having a power source, the power source comprising an output shaft arranged for, in use, rotation with a vehicle wheel shaft, the system further comprising an adapter plate, said adapter plate comprising fasteners for allowing fixed connection to a wheel hub of a wheel shaft being tested, said adapter plate further comprising fasteners for allowing fixed connection of the adapter plate to the output shaft of said dynamometer test unit to thereby connect the output shaft of the dynamometer test unit to said wheel shaft. The adapter plate is designed such that, when fixedly connected to said wheel hub but disconnected from said dynamometer test unit, said adapter plate is arranged to support the vehicle to allow relocation of said vehicle while supported by said adapter plate.

The present invention relates to a method for use in dynamometer testing of a vehicle powertrain component or a vehicle (), a dynamometer power source () of a vehicle dynamometer system being connected to an output shaft of a vehicle powertrain component or a vehicle wheel shaft, said dynamometer system being arranged to measure a reaction load and said method including, when testing: determining a first measure of a first reaction load of said first dynamometer power source, determining an influence of moment of inertia on said first measure of said first reaction load, and compensating said first measure of said first reaction load by said determined influence of moment of inertia.

The present invention relates to a method for use in dynamometer testing of a vehicle (), the vehicle () including at least a first wheel shaft and at least one first vehicle power source for providing power to said first wheel shaft, said first wheel shaft being connected to a vehicle dynamometer system, said vehicle dynamometer system comprising a first controllable dynamometer power source () for providing power to said first wheel shaft, said first dynamometer power source being an electrical machine () comprising a stator and a rotor, said stator comprising a stator winding. The method includes: determining whether a first temperature (T) is below a first temperature limit (T), and heating said electrical machine () by applying a current (I) to said stator winding when said first temperature (T) is below said first temperature limit (T).

The present invention relates to a method for measuring the content of at least one compound in an exhaust gas stream resulting from internal combustion. A first relative proportion of a first compound in the exhaust gas stream is measured by means of a first sensor, and a defined flow of a first gas is added to said exhaust gas stream downstream said first sensor. A second relative proportion of said first compound in the combined stream of said exhaust gas stream and said added gas is measured by means of a second sensor, and a mass flow of said first compound in said exhaust gas stream resulting from said combustion in said internal combustion is determined by means of said first and second relative proportions and said defined flow of said first gas. The invention also relates to a system and vehicle dynamometer.

Method and system for measuring the mass flow by means of dilution of an exhaust gas from internal combustion

A dynamometer test unit for use in dynamometer testing of a vehicle, where the vehicle includes at least a first wheel shaft and at least one first vehicle power source for providing power to the first wheel shaft. The first wheel shaft is, during testing, connected to a dynamometer test unit which includes a first individually controllable dynamometer power source for applying a first power to the first wheel shaft. The dynamometer test unit further includes a second individually controllable dynamometer power source for applying a second power to the first wheel shaft. The first and the second dynamometer power source apply a controllable power to the first wheel shaft during testing. The invention also relates to a dynamometer test system.

Method and device for dynamometer testing of a motor vehicle

Dynamometer testing of a vehicle comprising, with only a first wheel shaft connected to a dynamometer test unit, including the steps of applying a first power to the first wheel shaft, determining a representation of the first power using the dynamometer test unit, determining a second power, different from the first power, being applied to one or both of the first wheel shaft and the second wheel shaft, the second power being a virtual power represented by a virtual representation of second power, and, based on the representation of the first power determined by the dynamometer test unit and the virtual representation of the second power, determining a first speed which is a representation of the speed of the vehicle driven on a road and subjected to the first and second power.

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 () 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.

Method and device for testing of a combustion engine or an associated structure and a rig

A method and a device for dynamometer testing of a motor vehicle, having a front end and a rear end and a right side and a left side, as seen in a driving direction, and/or vehicle components, by measuring torque and rotational speed on drive shafts of the vehicle. A braking torque is applied to each one of the shafts by individual hydraulic dynamometer test units by throttling hydraulic fluid flows. The braking torque is adjustable for each individual one of the drive shafts such that a resulting individual rotational speed for that shaft corresponds to a virtual vehicle speed when driving the motor vehicle on a road, compensated with a slip value.

Growing community of inventors

Tyresö, Sweden

Christian Engström