Extraction of can bus signals without feedback

• US 8,976,015 B2
• Filed: 05/16/2006
• Issued: 03/10/2015
• Est. Priority Date: 05/24/2005
• Status: Active Grant

• Current Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Original Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Inventors: Rieth, Peter, Kelling, Enno, Menzel, Marc
• Primary Examiner(s): Lieu, Julie
• Application Number:
  US11/920,955
• Publication Number:
  US 20110199229A1
• Time in Patent Office: 3,220 Days
• Field of Search: None
• US Class Current: 340/438
• CPC Class Codes: G01D 21/00 Measuring or testing not otherwise provided for
• CPC Class Codes: H04B 2203/5441 Wireless systems or telephone
• CPC Class Codes: H04B 2203/5458 Monitor sensor; Alarm systems
• CPC Class Codes: H04B 2203/547 via DC power distribution
• CPC Class Codes: H04B 2203/5487 cables
• CPC Class Codes: H04B 2203/5491 using filtering and bypassing
• CPC Class Codes: H04B 3/56 Circuits for coupling, blocking, or by-passing of signals
• CPC Class Codes: H04L 12/40032 Details regarding a bus interface enhancer
• CPC Class Codes: H04L 2012/40215 Controller Area Network CAN
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

Disclosed is a method and a circuit configuration as well as a navigation system are disclosed, wherein the extraction and transmission of signals running on a line bus (1, 2) is carried out without having to sever the bus cable. Furthermore, a sensor (4) is disclosed, which outputs sensor signals reproducing the line signals and wherein the output sensor signals are amplified by a signal processing unit (11) and transformed into a defined digital signal shape (22). The filtered signals are then transmitted to a display device (14) or another device via an additional bus in wireless manner or by way of a line. The invention further relates to a tapping device for the wireless tapping of CAN data from a CAN line by the electromagnetic field, without having to sever the CAN lines, having a pivotable top shaped part (32), which can be pressed against a bottom part (35) by way of a pivot mechanism (41) for the purpose of accommodating CAN cables, and guide grooves (31 for accommodating the CAN cables (CAN1, CAN2), with conductor loops, in the closed position of the pivot mechanism, being closed around the CAN cables which are connectable to a signal processing electronics.

Claims

1. A method for wireless extraction, essentially without feedback, and transmission of signals running on a line bus (1, 2), the method comprising:

producing output sensor signals from a sensor (4), which is fed by fields produced by the signals running on the line bus;

amplifying the output sensor signals in a signal conditioning unit (11);

converting the output sensor signals into defined digital signals (22);

filtering the defined digital signals by a digital circuit; and

sending the filtered signals to a display device (14) or another device by an additional bus in wireless manner or by way of a line.

2. A circuit configuration for wireless extraction, essentially without feedback, and transmission of signals running on a line bus (1, 2), the circuit comprising:

a sensor (4), wherein the sensor is fed by fields produced by the signals running on the line bus, and wherein sensor signals output (at 8, 9) reproduces the signals running on the line bus;

a signal conditioning unit (11) for amplifying the sensor signals output by the sensor (4) and for converting the sensor signals into defined digital signals (22); and

a microcontroller (12), wherein the microcontroller filters the defined digital signals corresponding to a significance attached to them, with the filtered signals being sent to a display device (14) or another device by an additional bus in wireless manner or by way of a line.

3. The circuit configuration as claimed in claim 2, wherein the line bus (1) is a CAN bus of a motor vehicle, to which are connected several devices of the motor vehicle being monitored and/or controlled, and the sensor (4) is fed by electric or magnetic fields, which result from the signals on the CAN bus (1).

4. The circuit configuration as claimed in claim 3, wherein the sensor (4) is fed by electric fields, which result from signals on the CAN bus (1).

5. The circuit configuration as claimed in claim 4, wherein the sensor (4) is designed so that it acts at least with regard to a line (1 or 2, respectively) of the CAN bus (1) as a capacitor, at which the extracted electric signals (at 8, 9) can be tapped.

6. The circuit configuration as claimed in claim 4, wherein the CAN bus (1) includes two lines (2, 3), with the second line (2) conducting signals being inverse in relation to the signals on the first line (1), and in that the sensor (4) is designed in such a manner that it forms two separate capacitors with respect to the two lines (1, 2) of the CAN bus (1).

7. The circuit configuration as claimed in claim 4, wherein the sensor is designed so that it can be plugged detachably onto the CAN bus (1) by means of a plug coupling (4).

8. The circuit configuration as claimed in claim 4, wherein the sensor (4) is composed of two preferably symmetrically configured sensor halves (5, 6), which include grooves (7) corresponding to the associated line (1 or 2, respectively) that are provided with a coating forming a portion of a plate of the capacitor in such a fashion that a uniform capacitor plate is produced when the two sensor halves are plugged together.

9. The circuit configuration as claimed claim 2, wherein the signals sensed by the sensor are conveyed to a navigation system and are used there in particular for improving the accuracy of position.

10. The circuit configuration as claimed in claim 2, wherein the signals sensed by the sensor are transmitted via a radio interface such as BLUETOOTH®

, WLAN, ZigBee™

to an external device, such as a PDA, a laptop, or a corresponding portable computer.

11. A sensor (4) for a circuit configuration for extracting without feedback and transmission of signals running on a CAN bus (1), the sensor comprising:

a sensor (4) is fed by fields produced by the signals running on the CAN bus and outputs sensor signals (at 8, 9) that correspond to the signals running on the CAN bus, wherein the sensor (4) acts as a capacitor at least with respect to one line of the CAN bus (1), and extracted electric signals (8, 9) can be tapped at the capacitor.

12. The sensor as claimed in claim 11, wherein the sensor (4) forms two separate capacitors with respect to the two lines (1, 2) of the CAN bus (1).

13. The sensor as claimed claim 11, wherein the sensor can be plugged detachably onto the CAN bus (1) by means of a plug coupling (5, 6).

14. The sensor as claimed claim 11, wherein the sensor is composed of two symmetrically configured sensor halves (5, 6), which include grooves (7) corresponding to the associated line (1 or 2, respectively) that are provided with a coating forming a portion of a plate of the capacitor in such a fashion that a uniform capacitor plate is produced when the two sensor halves are plugged together.