SAE J643-2000 pdf download Hydrodynamic Drive Test Code
Scope-The range of test conditions on the dynamometer shall be suficient to determine the primaryoperating characteristics corresponding to the full range of vehicle operations.
The characteristics to be determined are:
Torque ratio versus speed ratio and output speeda.bInput speed versus speed ratio and output speedcEfficiency versus speed ratio and output speedCapacity factor versus speed ratio and output speede. lnput torque versus input speed
NOTE-For more information about these characteristics and the design of hydrodynamic drives, see “DesignPractices-Passenger Car Automatic Transmissions” SAE Advances in Engineering, Vol.5
Purpose–This code provides a means of determining operating characteristics of hydrodynamic drives usedin motor vehicle installations. t outlines a series of dynamometer tests and provides a method of presentingdata from these tests. The results obtained are complete enough to provide a basis for estimating vehicleperformance. Other special tests, such as centrifugal bursting, heat rejection, extreme temperature.cavitation, and charging pressure, may be required to evaluate the unit for particular applications oiconditions.
References
2.1 Applicable Publications–The following publications form a part of this specification to the extent specifiedherein. Unless otherwise indicated, the latest issue of SAE publications shall apply.
2.1.1SAE PUBLICATIONS-Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
SAE J651-Passenger Car and Truck Automotive Transmission Test CodeDesign Practices-Passenger Car Automatic Transmissions” SAE Advances in Engineering, Vol. 5
Equipment and Test Procedures
3Driving and absorbing dynamometers capable of torque measurements within t0.7 Nm and speedmeasurements within t5 rpm are to be used for most tests (same as required in SAE J651). When extremelyhigh torques are required, an accuracy range of +0.5% of full load reading is considered acceptable
3.2 An independently operating fluid supply system with provisions for pumping, heating, cooling, and regulatingthe flow and pressure of the fluid to the test unit should be used.
3.3 Instrumentation for measuring temperature and pressure of the fluid at the inlet and outlet of the hydrodynamic
drive is required.
Before starting tests for the characteristics, calibration curves should be obtained on the dynamometers andinstruments indicating torque, speed, pressure, and temperature.
3.5A fluid of known physical and chemical characteristics and approved by the manufacturer of the unit should beused.
3.6Fluid temperatures for all standard tests should be 90 to 100 °C at the inlet, and 130 °C maximum at the outletof the hydrodynamic drive. Higher or lower temperatures may be used if recommended by the manufacturer orif representative of the application. At or near stall, the inlet temperature may be reduced to maintain outlettemperature.
3.7Unless otherwise specified, fluid pressures for standard tests should be enough to avoid cavitation.
All readings should be taken simultaneously with loads, speeds, temperatures, and pressures stabilized whenpossible. When such stabilization is not possible, the time interval between readings and the rate of changemust be noted.
Standard Tests
Operating Modes–There are two usual performance modes for recording and collecting data.
Drive PerformanceNormal rotation with normal power flow (impeller driving)aCoast Performance-Normal rotation with reverse power flow (turbine driving) as in vehicle closedthrottle coasting operation.
Passenger Cars, Trucks, Buses, And Motorcycles
Required Data:
Input TorqueInput speedOutput torqueOutput speedOutlet temperaturePhysical and chemical characteristics of the fluid
Fluid flow rateInlet pressureOutlet pressureInlet temperature