192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1986-11-25
1989-04-04
Bonck, Rodney H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192 0033, 192 0076, 192 0084, B60K 4128, B60K 4102
Patent
active
048177768
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a starting control apparatus for an automatic transmission system of the type in which the stroke of a friction clutch interposed between an engine of a vehicle and a transmission is electronically controlled through an actuator, and the meshing position of the gears of the transmission is also electronically controlled through gear position change-over means.
This invention relates also to a duty control circuit incorporated in an automatic transmission system of a type as described above, so as to generate and apply a pulse signal to an electromagnetic valve controlling the operation of an actuator actuating a clutch of a vehicle.
2. Background Art
For the purpose of alleviating the driver's effort to maneuver a large-sized truck, bus or the like, an automatic transmission system capable of automatically selecting the gear position depending on the running condition of the vehicle has been proposed.
Conventional automatic transmission systems are exclusively designed for use in small-sized passenger cars.
This automatic transmission system has generally such a structure that a fluid coupling such as a hydraulic torque converter is interposed between an engine and a planetary gear type transmission controlled by hydraulic pressure, and the gear position of the planetary gear type transmission is changed over by hydraulic pressure, and the gear position of the planetary gear type transmission is changed over by gear position change-over means.
An important matter to be taken into consideration for the development of an automatic transmission system suitable for application to a large-sized truck or the like is that the number of production of vehicles of this kind is very small as compared to that of passenger cars. Therefore, newly designing an expensive torque converter or the like is quite disadvantageous from the aspect of cost, and it is desirable that the existing drive system including the friction clutch and transmission as well as the existing production equipment, be directly utilized without any alteration.
On the other hand, a clutch actuator used in an automatic transmission system is operated by a fluid supplied from a high-pressure fluid source, and the charge-discharge of the fluid is controlled by an electromagnetic valve. A duty control circuit is connected to such an electromagnetic valve. The electromagnetic valve is opened and closed according to a duty ratio of a pulse signal generated from the duty control circuit to increase or decrease the amount of actuation of the clutch actuator controlling the clutch, so that stepwise control of the state of engagement of the clutch can be achieved. That is, when the vehicle is to be started or when the speed ratio of the vehicle is changed, it is desirable to finely adjust the position of the clutch from the disengaged position toward the engaged position. One prior art means for realizing such fine adjustment of the clutch position, includes a plurality of oscillation circuits generating pulse signals having respectively different duty ratios which are disposed in parallel, so that one of the pulse signals having the desired duty ratio can be suitably selected.
DISCLOSURE OF INVENTION
With such knowledge in mind, it is a primary object of the present invention to provide a starting control apparatus for an automatic transmission system, which can automatically achieve a smooth speed shift under electronic control in spite of the fact that the existing drive system is directly used without any alteration.
In accordance with the present invention, there is provided a starting control apparatus for an automatic transmission system comprising engine control means for controlling an increase and a decrease of the rotation speed of an engine; a clutch coupled to an output shaft of the engine; a parallel-shaft type gear transmission coupled at an input shaft thereof to the clutch; a clutch actuator for actuating engagement and disengagement of the clutch; clutch position detecting means fo
REFERENCES:
patent: 4493228 (1985-01-01), Vukovich et al.
patent: 4505368 (1985-03-01), Ackermann et al.
patent: 4509628 (1985-04-01), Junginger et al.
patent: 4618043 (1986-10-01), Hattori et al.
patent: 4662494 (1987-05-01), Wakiya et al.
Fukushima Shigeki
Iwamoto Tomoyuki
Tateno Toshiaki
Bonck Rodney H.
Testardi David A.
LandOfFree
Starting control apparatus for automatic transmission system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Starting control apparatus for automatic transmission system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Starting control apparatus for automatic transmission system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-173572