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| About Hybrid Electric Drives By combining AC vector-controlled, electric motor power to the conventional mechanical powertrain, hybrid electric propulsion systems are able to reduce the demand on the engine, thereby lowering emissions and improving fuel economy. By using electric motors as generators during deceleration, vehicle braking energy is recovered and stored as battery energy to be re-used during peak load periods. Brake life is extended and maintenance costs and downtime are reduced. |
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| Test Systems The state-of-the art test stands, developed to test the hybrid electric propulsion systems, utilize input and output variable-speed dyne motors, each in excess of 300-hp and capable operating in various modes of operation. Each dyne motor operates in speed, torque or road-load simulation mode. The input motor is also designed to operate in engine emulation mode. The variable-speed AC input dyne motor has power in excess of 300-hp and with the use of a gear increaser it is able to achieve up to 12,000 rpm. The variable-speed AC output dyne motor is also in excess of 300-hp and achieves speeds of up to 4,000 rpm. The variable-speed systems are powered by control systems from Rockwell Automation. The Rockwell Automation controller provides all the machine logic control, in addition to all the modes of operation for the variable-speed drive regulators. The man/machine computer interfaces link directly to the Rockwell Automation controller for machine status and operating set points. This communication is handled over digital and analog I/O, ModBus and CAN interfaces. |
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| Sub-Systems The dynamometer is equipped with the following sub-systems to provide cooling and lubrication for the system: the oil cooling system operates through a water-to-oil heat exchanger for the cooling of the input and output variable speed dyne motors; an air/oil spray mist system is used for the variable-speed motor bearing lubrication; an oil-lube pump system satisfies the gearbox lubrication requirements. |
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| Sensors The input dyne has an inline torque cell rated for a maximum of 5,000 Nm, while the output dyne has an inline torque cell rated for a maximum of 50,000 Nm. Non-contact antennas provide the electrical signal feedback to the system controller. |
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| Modes of Operation The input and output dyne motors can be operated in either tandem or individual control for a variety of test pieces. The speed mode selection allows for setting the desired operating speed, while the torque mode selection allows for applying a desired absorbing torque on the test piece. Road load simulation mode allows for simulating the vehicle driving on level and up and down hill conditions. The absorbing loads are then automatically adjusted for the desired grade. Windage, hill grade, braking torque from vehicle brakes are examples of additional variables that may be entered by the operator. |
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| For More Information For more information about the products and services offered through our Engineered Products Division or to discuss how we can help your organization accomplish your testing objectives, contact Mustang Dynamometer at 1-888-468-7826. |
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