Process for the wireless transmitting of energy and data

• US 6,091,779 A
• Filed: 12/22/1997
• Issued: 07/18/2000
• Est. Priority Date: 12/20/1996
• Status: Expired due to Term

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Griessbach, Robert
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Rupert, Paul N
• Application Number:
  US08/996,299
• Time in Patent Office: 939 Days
• Field of Search: 375/258, 307/10.1
• US Class Current: 375/258
• CPC Class Codes: B60R 16/027 between relatively movable parts of the vehicle, e.g. between steering wheel and column devices for measuring, signalling or controlling tyre pressure or temperature specially adapted for mounting on vehicles B60C23/00

Abstract

In the case of a process for the wireless transmission of energy and data between two parts, preferably the steering wheel and the steering column of a vehicle, having a transformer-type transmitter and consisting of a primary and secondary winding assigned to the parts, and a rectangular carrier frequency on the primary side, the data transmission is carried out in one direction by the modulation of the carrier signal and in the other direction outside the switching flanks of the carrier signal.

Claims

1. Process for wireless transmission of energy and data between two parts using a transmitter comprising a transformer which has a primary winding assigned to one part on a primary side and a secondary winding assigned to the other part on a secondary side, via a rectangular carrier signal having flanks defined by switching edges of said rectangular carrier signal, which is generated on the primary side, said process comprising:

transmitting data from the primary to the secondary side at a first data transmission rate, by at least one of amplitude and phase modulation of the carrier signal; and

transmitting data from the secondary to the primary side at a second data transmission rate by selectively modulating high frequency bursts onto said rectangular carrier signal as a function of transmitted data, at points outside switching flanks of the carrier signal.

2. The process according to claim 1 wherein data transmission in one direction is carried out by modulation at a higher frequency than data transmission in an opposite direction.

3. The process according to claim 2 wherein said second data transmission rate is an even-number multiple of said first data transmission rate.

4. The process according to claim 1 wherein data transmission from the primary to the secondary side is performed in a biphase code mode.

5. The process according to claim 2 wherein data transmission from the primary to the secondary side is performed in a biphase code mode.

6. The process according to claim 3 wherein data transmission from the primary to the secondary side is performed in a biphase code mode.

7. The process according to claim 1 wherein data transmission from the secondary to the primary side is performed by encoding HF-bursts.

8. The process according to claim 1 wherein said second data transmission rate is an even number multiple of said first data transmission rate.

11. A method for transmitting energy and data via an inductive coupling according to claim 1, wherein data are transmitted from said secondary side to said primary side by modulating said rectangular carrier signal at said secondary side by selectively superimposing HF-bursts on said rectangular carrier signal according to data to be transmitted from said secondary side to said primary side, at points on said rectangular carrier signal which are separated in time from switching flanks of said rectangular carrier signal.

9. A method for transmitting energy and data via an inductive coupling, comprising:

applying a square wave carrier signal to a primary side of said inductive coupling, whereby energy is transmitted to a secondary side of said inductive coupling, said square wave carrier signal having flanks defined by switching edges of said square wave carrier signal;

modulating said square wave carrier signal at said primary side by means of one of amplitude modulation, frequency modulation and phase modulation, according to data to be transmitted from said primary side to said secondary side, at a first data transmission rate;

modulating said square wave carrier signal at said secondary side by selectively superimposing high frequency bursts onto said square wave carrier signal according to data to be transmitted from said secondary side to said primary side, at points on said square wave carrier signal which are separated in time from switching flanks of said square wave carrier signal.

10. A method for transmitting energy and data via an inductive coupling according to claim 9, wherein

said data transmission from the primary side to the secondary side is performed in a biphase code mode;

and

said points at which said HF-bursts are superimposed on said square wave carrier occur at a second data transmission rate which is an even number multiple of aid first data transmission rate.