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US 8,771,144 B2Granted
Manual downshift control method for automatic transmission
AssigneeHonda Motor Co., Ltd.
InventorsMike Dickinson, Aaron Dorn
Life of this patent
Estimating the term…
Abstract
A control system and a method for controlling an automatic transmission that determines the disengagement of an off-going clutch and the engagement of an on-coming clutch by monitoring the corresponding hydraulic clutch pressures, and/or the calculated gear ratios with or without the assistance of off-pressure timer controls, or both.
Claims17
A method comprising the steps of:
- (a) providing a vehicle having a vehicle frame, an engine and an automatic transmission that is mounted to the vehicle frame and operatively connected to the engine;
- (b) determining a first hydraulic fluid pressure during an off-coming clutch phase;
- (c) triggering an increase in the engine power due to the first hydraulic fluid pressure reaching a first predetermined level;
- (d) determining a second hydraulic fluid pressure;
- and,
- (e) triggering a reduction in the engine power substantially fully due to the second hydraulic fluid pressure reaching a second predetermined level.
3 more elements
A vehicle comprising:
- a vehicle frame;
- an engine;
- an automatic transmission, wherein the automatic transmission is mounted to the vehicle frame and operatively connected to the engine;
- a control system for use in controlling the engine power when a pressure switch device:
- (1) determines that an off-going clutch is substantially released within the automatic transmission;
- and, (2) determines when an on-coming clutch is substantially fully engaged within the automatic transmission;
- and
- a throttle control device that:
- (1) increases engine power triggered by the off-going clutch becoming substantially released;
- and, (2) reduces engine power triggered by the on-coming clutch becoming substantially engaged.
7 more elements
Dependencies are inferred from the claim text.