Engine brake control for automatic transmission

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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74752C, B60K 4104

Patent

active

047652020

ABSTRACT:
An engine brake control comprises a pressure reduction valve which effects pressure reduction on hydraulic fluid pressure supplied to an engine brake friction element for activation thereof by discharging hydraulic fluid from the engine brake friction element. The engine brake friction element is to be activated to effect engine brake during operation with each of various speeds. The pressure reduction valve is operative to effect the pressure reduction when a first predetermined drive range (D range) is selected, while it is rendered inoperative to prevent the pressure reduction when a second predetermined drive range (II range) is selected.

REFERENCES:
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patent: 4680992 (1987-07-01), Hayasaki et al.
General Motors Corporation, H 700-R4-195-7/83, p. 68; "Complete Hydraulic Oil Circuits".

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