Machine element or mechanism – Gearing – Interchangeably locked
Reexamination Certificate
1998-07-20
2001-02-20
Marmor, Charles A (Department: 3681)
Machine element or mechanism
Gearing
Interchangeably locked
Reexamination Certificate
active
06189396
ABSTRACT:
The invention pertains to a control arrangement for an automatic, electrohydraulically controlled transmission, especially for motor vehicles.
In such automatic transmissions in motor vehicles, the hydraulic control, as well as various sensors for pressure and rpm, are integrated into the transmission and are connected via corresponding lines to the electronic control unit that is located outside of the transmission. This leads to very high assembly and parts costs, as well as a certain vulnerability to malfunctions due to possible line breaks.
The object of the invention is to propose a reduced-cost, easy-to-assemble, highly reliable arrangement of the hydraulic and electronic controls of the automatic transmission.
According to the invention, it is proposed that the hydraulic control and electronic control be built right next one another, in which case plug connections are provided between the solenoid valves of the hydraulic control and the electronic control. This can considerably reduce the line costs because the plug connections can be hard-wired in the electronic control unit or integrated into circuit boards and directly connected to the solenoid valves or their plug connectors.
Moreover, sensor arms can extend downward from the electronic control that ensure contactless sensing of the shaft-mounted transducer wheels of the input and output shafts of the automatic transmission past the hydraulic control. This ensures that the rpm sensors are also directly incorporated into the electronic control unit.
As a logical enhancement, at least one pressure sensor can also be arranged right in the electronic control unit that is connected to the control duct of the hydraulic control that is to be sensed in a fluid-tight manner, e.g., via a plug connector with a sealing ring.
With the aid of an integrated temperature sensor, the temperature of the hydraulic fluid can also be monitored in order, for example at low temperatures, to trigger a warm-run program and at excessively high temperatures to trigger intervention into the switching time of the starter coupling and/or power-reducing run programs in the electronic control.
At the electronic control there is preferably a single electric central connector through which the vehicle-specific control parameters, such as engine management, demand for power, etc. can be input and transmission data can be output. When the automatic transmission is being assembled or disassembled, with respect to the electric control it is therefore necessary only to close or detach one plug connector.
To ensure better accessibility of the hydraulic and electronic controls, these controls can be surrounded by a transmission cover, in which case a penetration in the cover tightly encases the central connection and makes it accessible from the outside.
To further simplify the assembly process, on the electronic control there can be another sensor that works directly together with a position transducer of a manually operated selector shaft that is swivel-mounted in the transmission. Thus, the shifting commands can also be directly input into the electronic control in a way that facilitates assembly. To ensure ease of production, the position transducer is preferably made of plastic, in which case for each selector position a magnetic element can be tied in to ensure contactless shift position sensing using the Hall effect system.
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Barnreiter Karl
Fleischmann Hans-Peter
Flierl Werner
Genzel Michael
Gottschaller Armin
Audi AG
Lalos & Keegan
Lau Michael N.
Marmor Charles A
Pang Roger
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