Method for controlling a gear unit of a motor vehicle having synchronizing devices
AssigneeDaimlerChrysler AG
InventorsWerner Hillenbrand, Frank Schleicher
Life of this patent
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Abstract
A method for controlling a gear unit of a motor vehicle having synchronizing devices. When an actuating device of a synchronizing device is controlled in terms of force or travel, strongly differing wear behavior occurs depending on use. The inclination of the travel path or the shifting frequency is detected during operation of the motor vehicle and a characteristic diagram is used in order to adapt the shifting force to the information item obtained.
Claims13
A method for controlling a gear unit of a motor vehicle having at least one pair of gear wheels permanently engaged with one another, a synchronizing device operationally connected to one of the gear wheels and to a transmission shaft arranged rotatably with respect to said one gear wheel wherein, upon actuation a rotationally fixed connection is made or released between said one gear wheel and the transmission shaft, said motor vehicle having at least one actuating device assigned to the synchronizing device for producing shifting forces between said one gear wheel and the transmission shaft and a control device for controlling at least one of the actuating device and the synchronizing device, said method comprising the steps of:
- storing a plurality of shifting events in said control device;
- providing said control device with at least one input signal;
- generating, in said control device, a control signal determined as a function of a synchronizing phase of the synchronizing device and as a function of said at least one input signal wherein at least one operating value, or a class is determined in said control device from one of the number of shifting events over an operating period and the temporal sequence of the shifting events and wherein the control signal is determined as a function of the determined operating value or the class;
- producing a shifting force in the actuating device as determined by the control signal.
A method for controlling a gear unit of a motor vehicle having at least one pair of gear wheels permanently engaged with one another, a synchronizing device operationally connected to one of the gear wheels and to a transmission shaft arranged rotatably with respect to said one gear wheel wherein, upon actuation a rotationally fixed connection is made or released between said one gear wheel and the transmission shaft, said motor vehicle having at least one actuating device assigned to the synchronizing device for producing shifting forces between said one gear wheel and the transmission shaft and a control device for controlling at least one of the actuating device and the synchronizing device, said method comprising the steps of:
- providing said control device with at least one input signal;
- generating, in said control device, a control signal determined as a function of a synchronizing phase of the synchronizing device and as a function of said at least one input signal wherein said at least one input signal contains an information item concerning the inclination of the travel path of the motor vehicle and wherein the control signal is determined as a function of the current inclination of the travel path of the motor vehicle;
- producing a shifting force in the actuating device as determined by said at least one control signal.
Dependencies are inferred from the claim text.