Electricity: motive power systems – Positional servo systems – Plural servomotors
Patent
1996-07-22
1998-05-05
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
Plural servomotors
318626, 74336R, 74473R, B60K 2000, G05G 900
Patent
active
057479607
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a motor vehicle power train control device which means motor, clutch and gearbox managing through several sensors, actuators and servo mechanisms while providing an intelligent substitute to automatic hydraulic gearboxes, without power consuming torque converters and additional braking devices thus allowing better motor and clutch management.
BACKGROUND OF THE INVENTION
The use of automatic gearbox based on hydraulic pump and torque converter characteristics has been well known for decades and used on all kinds of vehicles to automate the gearshift and clutch actuation, including the gas pedal movement (position) and gearbox load conditions, the only parameters gathered to decide a gearshift action. The disadvantages of this type of hydraulic automatic transmission has (a) also been well known including the lowering of transmission efficiency (increased power loss when compared to a manual gearshift) to perform vehicle departure from stop condition while transferring torque to the wheels and gearshift operations while moving on the road, (b) the number of gearshifts performed that is normally limited to 5 gears ahead and one rear gear, (c) the need to have it factory-installed due to the required more powerful motor, (d) the increased acquisition and operational costs if compared to a manual gearshift-motor couple and (e) the further need to have additional braking devices to help assure stopping of the vehicle as well.
Also known are the past use of gearshift devices, some electric, some hydraulic (British Leyland buses of the 60s and Chrysler vehicles of the 70s and more recently F-1 racing cars button actuated up-down gearshift. Additionally there are electronically controlled hydraulic clutch actuators made by Luk GmbH and Sachs GmbH, both German manufacturers. Further known are heavy vehicle electronic driven gearboxes made by Eaton--an American manufacturer, ZF--a German manufacturer and Volvo--a Swedish manufacturer, which use electronic gearshift engaging synchronizers and servo mechanism actuators to perform speedier gearshifts as compared to those made through mechanical synchronizing rings.
There are also some electronic controllers for the original hydraulic automatic transmission in order to tighten the gearshift point tolerance to permit different behavior in gearshift point to simulated heavy traffic or a clear road condition (calm or sporty response).
It is an object of this invention to provide low power, fully automated power train setup, wherein instantaneous different power transmissions behavior can be achieved while providing the feeling of an automatic transmission driver and also by permitting, through software control, a driver conducted manual gearshift when and where necessary.
SUMMARY OF THE INVENTION
The method and apparatus of a Computer Controlled Gearshift with Automatic Clutch Actuator for Vehicles with Manual Gearboxes comprises servo mechanisms, electric sensors, magnetic sensors, resistive potentiometer sensors and electric actuators connected to and controlled by a central microprocessor controller unit that performs a special set of instructions to automate all gearshift and clutch actuations in a manual gearbox equipped vehicle in such a way as to enable it to perform like an automatic transmission vehicle, without imposing any alterations to the vehicle manufacturer's motor-wheel transmission specifications.
Several types of clutch actuators and gearshifts devices are known, but none of them appear to encompass the behaviors here presented, specially the novel clutch dual servomotors concept which really senses moments of inertia related to all loads presented in a motor driven vehicle. Also the novel gearshifts electric servomotors with positioning feedback concept are best suited to assure fast gear engagement with or without synchronizing rings gears speed matching gearboxes. Furthermore, by allowing sensing of the moments of inertia, different power train behaviors can be continuously achieved in order to obt
REFERENCES:
patent: 5067362 (1991-11-01), Holdenried
patent: 5089962 (1992-02-01), Steeby
patent: 5089965 (1992-02-01), Braun
Ro Bentsu
Saulo Quaggio
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