Chrysler Corporation

Chrysler Group LLC

Daimlerchrysler Corporation

Ali M Mourtada

Hussein A Dourra

Javed Dada

David L Kwapis

Teddy Siy

Maurice B Leising

Fadi S Kanafani

Gary Binienda

A transmission for a vehicle includes a first gear set and a second gear set. A first plurality of elements are operable in an applied state and a released state and a second plurality of elements are operable in an applied state and a released state. A controller toggles the first and second plurality of elements between the applied state and the released state to achieve a desired gear ratio. The controller times entry of at least one of the first and second plurality of elements into the released state with entry of at least another of the first and second plurality of elements into the applied state by controlling a hold pressure applied to the at least one element entering the released state. The controller determines the hold pressure by referencing current operating conditions of the transmission in a lookup table stored in a memory of the controller.

Swap shift control scheme for an automatic transmission

An automatic transmission for a vehicle includes a main box controlled using a series of clutches, and an underdrive assembly controlled using a series of clutches and at least one overrunning clutch. In achieving a double-swap downshift from a first transmission 'gear' employing a first main box clutch and a first underdrive assembly clutch, to a second transmission 'gear' employing a second main box clutch and a second underdrive assembly clutch, a controller delays release of the first main box clutch until after the second underdrive assembly clutch has been prefilled, and fully applies the second underdrive assembly clutch only after slip has been detected in both the main box and the underdrive assembly. Additionally, the controller fully applies the second main box clutch only after the second underdrive assembly clutch has itself been fully applied.

Transmission downshift swap-shift control

A system for monitoring performance of a fuel system in a vehicle includes a plurality of sensing modules that periodically sense data from a plurality of control systems in the vehicle during a predetermined evaluation period. The system includes a control module that analyzes the data after the evaluation period, generates performance ratings for the control systems based on the data, generates a set of values for the performance of the fuel system based on the performance ratings and a plurality of predetermined fuzzy logic rules, and generates a control signal based on a numerical analysis of the set of values. The system includes an indicator module that indicates in real time whether the performance of the fuel system conforms to a designed performance of the vehicle based on the control signal.

Fuel system performance monitor

An automatic transmission for a vehicle includes a multi-plate clutch having an applied state and a released state and an overrunning clutch having an engaged state and an overrunning state. In addition, the transmission includes a controller that effectuates a gear shift of the transmission by applying a volume of fluid to the multi-plate clutch to toggle the multi-plate clutch from the released state to the applied state at approximately the same time the overrunning clutch is toggled into the overrunning state. The applied volume of fluid at which the multi-plate clutch is applied is substantially given by the following equation:&#x2212;()

Up shift control with overrunning clutch

An automatic transmission for a vehicle includes an input shaft, an output shaft, a first and second plurality of gears, and a series of engagement elements. The series of engagement elements includes at least one overrunning engagement element in mechanical communication with the second plurality of gears. A controller is operable to disengage a first engagement element associated with a first one of the first plurality of gears and apply a second engagement element associated with a second one of the first plurality of gears to achieve a speed change of the first plurality of gears. The controller is adapted to disengage one of the overrunning engagement elements from engagement with one of the second plurality of gears within a range of 20 to 120 milliseconds after the speed change of the first plurality of gears to accomplish a gear shift of the transmission.

Growing community of inventors

Dearborn Heights, MI, United States of America

Ali M Mourtada