DEVICE FOR DETECTING OPERATING STATES IN AN AUTOMATIC TRANSMISSION

Abstract

A device (1) for detecting operating states in a transmission has position sensors (4) for detecting the respective position of shiftable gear elements (6) and has a detector (10) for measuring the temperature in the transmission housing (2). In order to obtain sufficiently reliable and precise information about the temperature in the transmission housing (2), temperatures are measured at locations which are as different as possible in the transmission housing (2). For this purpose there is provision that at least one position sensor (4) has a sensor housing (3), in or at which a detector (10) for measuring the temperature is structurally integrated. In order to determine the temperature at different locations in the transmission housing (2), at least two such combined sensors (4) are used.

Claims

1. A device (1) for detecting operating states in a transmission, which device (1) has position sensors (4) for detecting the respective position of shiftable gear elements (6) and has at least one temperature detector (10) for measuring the temperature in the transmission housing (2), wherein at least one of the position sensors (4) has a sensor housing (3), with which one of the at least one temperature detector (10) for measuring the temperature is structurally integrated.

2. The device as claimed in claim 1, wherein the one of the at least one temperature detector is a temperature sensor element and the at least one position sensor (4) is structurally integrated with the temperature sensor element (11).

3. The device as claimed in claim 1 wherein the at least one position sensor (4) is configured for compensating the temperature.

4. The device as claimed in claim 1, wherein the sensor housing (3) is connected to a central connecting plug (14) via an assigned sensor line (12).

5. The device as claimed in claim 4, wherein the device is configured to transmit position signals and temperature signals as two separate analog signals or digital signals via the sensor line (12).

6. The device as claimed in claim 4, wherein the device is configured to transmit a digital output signal with combined information composed of position information and temperature information via the sensor line (12).

Description

BRIEF DESCRIPTION OF THE DRAWING

[0016] The single FIGURE of said drawing shows a schematic view of a device for detecting operating states in a transmission.

DETAILED DESCRIPTION OF THE DRAWING

[0017] A device 1 for detecting operating states in a transmission has position sensors with integrated temperature sensors.

[0018] The FIGURE shows a transmission housing 2 with a transmission housing flange 5 on which, in the present example, four structurally identical combined position sensors 4 are arranged, of which only one will be described below by way of example. The position sensor 4 has the function of transmitting the shift position of the shiftable gear element 6, for example, a shift fork, which is assigned to said position sensor 4, and of transmitting said shift position to an electronic transmission control unit 8.

[0019] The position sensor 4 has a housing 3 in which, in addition to a position detector 9 for measuring the position, detector 10 for measuring the temperature, for example, a conventional temperature sensor element 11, are also structurally integrated. The position information of the position sensor 4 and the temperature information of the temperature sensor element 11 are conducted via a common sensor line 12 to a central connecting plug 14, from which said information can be passed on for evaluation to the electronic gear control unit 8.

[0020] As has already been stated, the integrated position sensors 4 which are illustrated in the FIGURE are structurally and functionally identical, such that they do not have to be described individually.

[0021] As has already been described above, the detector 10 for measuring the temperature can also be configured for compensating the temperature of the position sensor 4, so that the signal which is conducted via the sensor line 12 contains position information and temperature information which is evaluated in the electronic gear control unit.

LIST OF REFERENCE NUMBERS (PART OF THE DESCRIPTION)

[0022] 1 Device for detecting operating states

[0023] 2 Transmission housing

[0024] 3 Sensor housing

[0025] 4 Position sensor

[0026] 5 Transmission housing flange

[0027] 6 Shiftable gear element, shift fork

[0028] 8 Electronic gear control unit

[0029] 9 Position detector

[0030] 10 Temperature detector

[0031] 11 Temperature sensor element

[0032] 12 Sensor line

[0033] 14 Central connecting plug