Patents Assigned to Rototest International AB
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Patent number: 11506551Abstract: 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.Type: GrantFiled: January 31, 2019Date of Patent: November 22, 2022Assignee: ROTOTEST INTERNATIONAL ABInventors: Christian Engström, Nils G. Engström, Jonny Färnlund
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Patent number: 11169054Abstract: 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.Type: GrantFiled: May 11, 2018Date of Patent: November 9, 2021Assignee: ROTOTEST INTERNATIONAL ABInventors: Christian Engström, Nils G. Engström, Jonny Färnlund
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Publication number: 20200363277Abstract: 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.Type: ApplicationFiled: January 31, 2019Publication date: November 19, 2020Applicant: ROTOTEST INTERNATIONAL ABInventors: Christian ENGSTRÖM, Nils G. ENGSTRÖM, Jonny FÄRNLUND
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Patent number: 10739234Abstract: 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.Type: GrantFiled: May 30, 2017Date of Patent: August 11, 2020Assignee: ROTOTEST INTERNATIONAL ABInventors: Nils G. Engström, Jonny Färnlund, Christian Engström
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Publication number: 20200225120Abstract: 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, the method includes: —in use, applying a torque to said first wheel shaft using a first controllable dynamometer power source of a vehicle dynamometer test unit rigidly connected to said wheel hub, —wherein a change of steering angle of said wheel hub rotates said rigidly connected first dynamometer test unit, characterized in the method including, when changing steering angle of said wheel hub: —applying an external force acting on the dynamometer test unit to influence force required by the vehicle steering mechanism to change steering angle of said wheel hub.Type: ApplicationFiled: May 11, 2018Publication date: July 16, 2020Applicant: ROTOTEST INTERNATIONAL ABInventors: Christian ENGSTRÖM, Nils G. ENGSTRÖM, Jonny FÄRNLUND
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Publication number: 20190368972Abstract: 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 means for allowing fixed connection to a wheel hub of a wheel shaft being tested, said adapter plate further comprising means 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.Type: ApplicationFiled: May 30, 2017Publication date: December 5, 2019Applicant: ROTOTEST INTERNATIONAL ABInventors: Nils G. Engström, Jonny Färnlund, Christian Engström
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Patent number: 10444119Abstract: The present invention relates to a method for use in dynamometer testing of a vehicle powertrain component or a vehicle (100), a dynamometer power source (201) 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.Type: GrantFiled: March 30, 2015Date of Patent: October 15, 2019Assignee: Rototest International ABInventors: Christian Engström, Nils G. Engström, Jonny Färnlund
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Patent number: 9893673Abstract: The present invention relates to a method for use in dynamometer testing of a vehicle (100), the vehicle (100) 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 (201) for providing power to said first wheel shaft, said first dynamometer power source being an electrical machine (201) comprising a stator and a rotor, said stator comprising a stator winding. The method includes: determining whether a first temperature (T1) is below a first temperature limit (Tlim1), and heating said electrical machine (201) by applying a current (Iheat) to said stator winding when said first temperature (T1) is below said first temperature limit (Tlim1).Type: GrantFiled: December 9, 2014Date of Patent: February 13, 2018Assignee: Rototest International ABInventors: Nils G. Engström, Jonny Färnlund, Christian Engström
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Patent number: 9863850Abstract: 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.Type: GrantFiled: December 28, 2012Date of Patent: January 9, 2018Assignee: Rototest International ABInventor: Christian Engström
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Publication number: 20170176293Abstract: The present invention relates to a method for use in dynamometer testing of a vehicle powertrain component or a vehicle (100), a dynamometer power source (201) 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.Type: ApplicationFiled: March 30, 2015Publication date: June 22, 2017Applicant: Rototest International ABInventors: Christian Engstrom, Nils G. Engström, Jonny Färnlund
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Publication number: 20160308484Abstract: The present invention relates to a method for use in dynamometer testing of a vehicle (100), the vehicle (100) 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 (201) for providing power to said first wheel shaft, said first dynamometer power source being an electrical machine (201) comprising a stator and a rotor, said stator comprising a stator winding. The method includes: determining whether a first temperature (T1) is below a first temperature limit (Tlim1), and heating said electrical machine (201) by applying a current (Iheat) to said stator winding when said first temperature (T1) is below said first temperature limit (Tlim1).Type: ApplicationFiled: December 9, 2014Publication date: October 20, 2016Applicant: Rototest International ABInventors: Nils G. Engström, Jonny Färnlund, Christian Engström
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Patent number: 9360395Abstract: 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.Type: GrantFiled: October 17, 2011Date of Patent: June 7, 2016Assignee: Rototest International ABInventors: Nils G. Engstrom, Christian Engstrom, Jonny Farnlund
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Publication number: 20140331980Abstract: 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.Type: ApplicationFiled: December 28, 2012Publication date: November 13, 2014Applicant: Rototest International ABInventor: Christian Engström
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Patent number: 8689618Abstract: 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.Type: GrantFiled: June 14, 2011Date of Patent: April 8, 2014Assignee: Rototest International ABInventor: Christian Engström