Method and system for testing automotive power transmission and analyzing engine output characteristic using dynamometer
First Claim
1. A method for testing engine output characteristics of an engine connected with a vehicular power transmission, comprising the steps of:
- (a) measuring an engine operating parameter;
(b) measuring at least a first revolutional speed on an input or output shaft of a power transmission connected to said engine and a first output torque of the power transmission when the engine operating parameter indicates a predetermined value;
(c) measuring a second revolutional speed on the input or output shaft of the power transmission and second output torque of the power transmission when a low inertia driving unit having the same characteristic as the engine is connected and driven with the power transmission under the same operating parameter measured in the step (a);
(d) measuring a first drive torque of the low inertia driving unit in the state of step (c);
(e) measuring a third revolutional speed on the input or output shaft of the power transmission and a third output torque of the power transmission when a predetermined time has elapsed after the step (c) and the same low inertia driving unit is connected and driven in the same way as in the step (c); and
(f) measuring a second drive torque of the low inertia driving unit when a difference in the values of the second and third revolutional speeds and second and third output torques fall within a predetermined range, the second drive torque being estimated as the output characteristic of the engine connected to the power transmission.
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Abstract
A system and method for testing a specimen such as a vehicular power transmission (e.g., an automatic transmission) and analyzing an engine output characteristic of an engine connected to the power transmission in which at least a first revolutional speed on an input or output shaft of the power transmission and a first output torque of the power transmission are measured when the engine operating parameters indicate a predetermined value with the power transmission connected to the engine. A second revolutional speed on the input or output shaft of the power transmission and a second output torque of the power transmission are measured when a low inertia driving unit having the same characteristics as the engine is connected any driven with a power transmission under the same operating parameters described above. A first drive torque of the low inertia driving unit is then measured, a third revolutional speed on the input or output shaft of the power transmission and a third output torque of the power transmission are measured when a predetermined time has passed and when the same low inertia driving unit is connected and driven in the same way, and a second drive torque of the lower inertia driving unit is measured when difference values between the second and third revolutional speeds and second and third output torque fall within a predetermined range. The second drive torque is estimated as the output characteristic of the engine connected to the power transmission.
12 Citations
17 Claims
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1. A method for testing engine output characteristics of an engine connected with a vehicular power transmission, comprising the steps of:
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(a) measuring an engine operating parameter; (b) measuring at least a first revolutional speed on an input or output shaft of a power transmission connected to said engine and a first output torque of the power transmission when the engine operating parameter indicates a predetermined value; (c) measuring a second revolutional speed on the input or output shaft of the power transmission and second output torque of the power transmission when a low inertia driving unit having the same characteristic as the engine is connected and driven with the power transmission under the same operating parameter measured in the step (a); (d) measuring a first drive torque of the low inertia driving unit in the state of step (c); (e) measuring a third revolutional speed on the input or output shaft of the power transmission and a third output torque of the power transmission when a predetermined time has elapsed after the step (c) and the same low inertia driving unit is connected and driven in the same way as in the step (c); and (f) measuring a second drive torque of the low inertia driving unit when a difference in the values of the second and third revolutional speeds and second and third output torques fall within a predetermined range, the second drive torque being estimated as the output characteristic of the engine connected to the power transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for testing an engine output characteristic of an engine connected with a vehicular power transmission a low inertia driving unit, comprising:
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(a) first means for measuring an engine operating parameter; (b) second means for measuring at least a first revolutional speed on an input or output shaft of a power transmission connected to said engine and a first output torque of the power transmission when the engine operating parameter indicates a predetermined value; (c) a low inertia driving unit having the same characteristic as the engine; (d) third means for measuring a second revolutional speed on the input or output shaft of the power transmission and second output torque of the power transmission when said low inertia driving unit is connected and driven with the power transmission under the same operating parameter measured in the step (a); (e) fourth means for measuring a first drive torque of the low inertia driving unit in the state of step (d); (f) fifth means for measuring at a third revolutional speed on the input or output shaft of the power transmission and a third output torque of the power transmission when a predetermined time has elapsed after the step (d) and the same low inertia driving unit is connected and driven in the same way as the step (d); and (g) sixth means for measuring a second drive torque of the low inertia driving unit when a difference in the values of the second and third revolutional speeds and second and third output torques fall within a predetermined range, the second drive torque being estimated as the output characteristic of the engine connected to the power transmission.
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Specification