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Engine braking control system for automotive automatic transmissions
| Details |
Inventors: Iizuka, Naonori;
Assignee: Jatco Corporation (JP)
Primary Examiner: Bonck; Rodney H.
Assistant Examiner: Whitelaw; Nicholas
Attorney, Agent or Firm: Kananen; Ronald P.
An engine braking control system for automotive automatic transmissions, comprises shift solenoids activated for executing a down-shift operation by selectively engaging or releasing frictional elements of a gear train, in response to engine braking requirements, sensors for monitoring a vehicle speed, an opening angle of a throttle valve, a depression amount of a brake-pedal, and a controller for controlling the down-shift operation on the basis of the signals from the sensors. The controller activates the shift solenoids for executing the down-shift operation only when the throttle opening angle is equal to or less than a predetermined threshold throttle opening angle, the brake-pedal depression amount exceeds a predetermined threshold depression amount and the vehicle speed is less than a predetermined threshold vehicle speed. The controller deactivates the shift solenoids when the throttle opening angle is equal to or less than the predetermined threshold throttle opening angle and the brake-pedal depression speed, derived on the basis of the signal representative of the brake-pedal depression amounts, exceeds a predetermined threshold depression speed. |
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DETAILED DESCRIPTION It is therefore, in view of the above disadvantages, an object of the present invention to provide an engine braking control system for automotive automatic transmissions, applying engine braking by down-shifting, which can provide a comfortable feeling during normal braking operation.
It is another object of the invention, to provide an engine braking control system for automotive automatic transmissions which can prevent wheel-lock due to quick depression of a brake-pedal, during quick braking operation.
In order to accomplish the aforementioned and other objects, an engine braking control system for an automotive automatic transmission, comprises shift solenoids activated for executing a down-shift operation by selectively engaging or releasing frictional elements for a gear train, in response to an engine braking requirement, sensor means for monitoring a vehicle speed, an opening angle of a throttle valve, and a depression amount of a brake-pedal, the sensor means generating signals respectively representative of the vehicle speed, the throttle valve opening angle and the brake-pedal depression amount, and engine braking control means for controlling the down-shift operation on the basis of the signals from the sensor means such that the control means activates the shift solenoids only when the throttle opening angle is equal to or less than a predetermined threshold throttle opening angle essentially equivalent to a fully closed state of the throttle valve and the brake-pedal depression amount exceeds a predetermined threshold depression amount and the vehicle speed is less than a predetermined threshold vehicle speed.
The engine braking control system further comprises means for deriving a depression speed of the brake pedal on the basis of the signals representative of at least two brake-pedal depression amounts.
The control means deactivates the shift solenoids when the throttle opening angle is equal to or less than the predetermined threshold throttle opening angle and the brake-pedal depression speed exceeds a predetermined threshold depression speed
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