Torque splitting device using hydraulic clutches

Details Torque splitting device using hydraulic clutches Torque splitting device using hydraulic clutches

1997-10-06

1999-12-28

Lorence, Richard M.

Interrelated power delivery controls, including engine control

Transmission control

With clutch control

477 97, 475117, B60K 4102, F16H 5960

Patent

active

060074531

ABSTRACT:
An improvement is made to a torque splitting device employing hydraulic clutches so as to avoid any discontinuity in the control even when the properties of the actuating oil such as the pressure and temperature thereof deviate from standard values. For instance, when the oil temperature is low, the target value of the oil pressure for each of the clutches is modified to a lower value. Thus, it becomes possible to make less pronounced any delay in the response of the torque splitting device which may arise due to the sluggishness of the oil as it flows out of the clutch cylinder. The oil pump is typically actuated by a member rotating at a speed proportional to the vehicle speed, and the pressure output of the pump may be inadequate in a low speed range. In such a case, the target value is again reduced so as to reduce any abrupt change in the property of the torque splitting device when the vehicle is accelerated from a low speed. Because the pressure output of the pump normally drops as the oil temperature rises, it is desirable to take into account the oil temperature in this control action as well.

REFERENCES:
patent: 4727966 (1988-03-01), Hiramatsu et al.
patent: 5259476 (1993-11-01), Matsuno et al.
patent: 5611752 (1997-03-01), Kamada et al.
patent: 5692987 (1997-12-01), Shibahata et al.
patent: 5700226 (1997-12-01), Droste
patent: 5709627 (1998-01-01), Teraoka
patent: 5813939 (1998-09-01), Masumoto et al.

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