移动液压测功机（MoHyD）的应用.pdf

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1、Mobile Hydraulic Dynamometer(MoHyD)CRC,San DiegoMarch 13,2024Axel Freund,John OCain&Elena FloreaAgenda MoHyD Background What is MoHyD?General Specifications Testing with MoHyD Equipment Tested Test Data Current&Future Plans Alternative Test Method Next Steps2MoHyD3BackgroundIn-field testing-PEMSEngi

2、ne dyno testing lab analyzersAvailable testing options for in-use emission measurement4What is MoHyD?MoHyD is a standalone instrument that connects to the hydraulic system of the off-road equipment Capable of loading and operating the engines without removing the engines from the equipment Can mimic

3、 the operation of an engine dynamometer over various cycles:Non-Road Transit Cycles(NRTC)and Ramped Modal Cycles(RMC)In-field testingMoHyDalternative to engine dyno Engine dyno testing5Typical MoHyD Set UpMoHyDElectrical ConnectionsHose ConnectionsTest EquipmentHydraulic Oil Cooler6General Specifica

4、tions Closed/open looped valve system Electric control system Additional hydraulic fluid cooler and hydraulic cooling fans Electronic computer7Overall MoHyD SpecificationsParameterValueNotesMaximum Power298 kW(400 hp)Maximum Flow1600 lpm(424 gpm)Limited by max permissible flow meterMaximum Fluid Tem

5、perature70 C(158 F)Limited by temperature rating of flow meterMaximum Pressure350 bar(5,089 psi)Maximum Ambient Temperature50 C(122 F)Limited by Compact RIO controllerSystem CleanlinessISO 4406 class 20/18/15Electrical Interface to the Test Unit Connections to test machine Pedal position control CAN

6、,PWM,Analog CAN bus(OBD port&proprietary CAN buses)PWM outputs for controlling electronic pumps Parking brake solenoid valves as needed8Safety Features Enclosed system with Plexiglass 40 gallons containment pan Pressure relief valves manifold Pressure and temperature sensors manifold Secondary conta