Slave node and local interconnect network (LIN network) having same

• US 20050265344A1
• Filed: 03/07/2005
• Published: 12/01/2005
• Est. Priority Date: 05/03/2004
• Status: Active Grant

• Current Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Harris, Dale M., Streit, James W., Hanna, Terry L.
• Granted Patent: US 7,701,943 B2
• Time in Patent Office: Days
• US Class Current: 370/392
• CPC Class Codes: B60H 1/00642 Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices B60H1/3201 - B60H1/3208, B60H1/3225 take precedence
• CPC Class Codes: B60H 1/0073 Control systems or circuits characterised by particular algorithms or computational models, e.g. fuzzy logic or dynamic models
• CPC Class Codes: H04L 12/40032 Details regarding a bus interface enhancer
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling
• CPC Class Codes: H04L 2012/40234 Local Interconnect Network LIN
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle

Abstract

A slave node for use with a Local Interconnect Network (LIN network) receives incoming messages from the LIN network in a manner that reduces operating current, power consumption and/or operating temperature. The slave node generally includes an input circuit, an electronic processing device, associated components such as an Integrated Glass Fog Sensor (IGFS) unit, and a transmitting device all mounted on a single circuit board. The input circuit, which can either be separate from or incorporated within the electronic processing device, pre-filters an incoming message from a LIN bus such that it only wakes the transmitting device out of its low-current sleep mode when required. Stated differently, the transmitting device is removed from an incoming message path so that it is only active when it is transmitting an outgoing message.

Claims

1. A slave node for use in a LIN network, comprising:

an input circuit for receiving an incoming message from the LIN network, said input circuit having a first signal input coupled to the LIN network and a first signal output;

an electronic processing device for interpreting the incoming message and/or compiling an outgoing message, said electronic processing device having a second signal input coupled to said first signal output and a second signal output; and

a transmitting device for transmitting the outgoing message to the LIN network, said transmitting device having a third signal input coupled to said second signal output, and a third signal output coupled to the LIN network;

wherein said input circuit is separate from said transmitting device, such that said transmitting device is generally inactive during reception of the incoming message.

2. The slave node of claim 1, wherein said input circuit further includes at least one of the following:

a level-shift circuit for shifting the voltage of the signals of the incoming message, a ground-shift circuit for compensating for fluctuations in a ground reference, and a comparator for waveshaping the signals of the incoming message.

3. The slave node of claim 2, wherein said at least one of the following circuits and/or components is integrated into said electronic processing device.

4. The slave node of claim 1, wherein said input circuit further includes a level-shift circuit for shifting the voltage of the signals of the incoming message, a ground-shift circuit for compensating for fluctuations in a ground reference, and a comparator for waveshaping the signals of the incoming message.

5. The slave node of claim 4, wherein at least one of said level-shift circuit, said ground-shift circuit and said comparator is integrated into said electronic processing device.

6. The slave node of claim 1, wherein said transmitting device inactivity is due to said transmitting device being operated in a sleep mode, and said transmitting device is only woken up from said sleep mode when it is transmitting the outgoing message.

7. The slave node of claim 1, wherein said electronic processing device is a digital microcontroller.

8. The slave node of claim 1, wherein said slave node is a glass fog sensor slave node used in conjunction with a vehicle windshield, and further includes an Integrated Glass Fog Sensor (IGFS) unit coupled to said electronic processing device.

9. A LIN network having a LIN bus, a master node, and said slave node of claim 1, wherein said master and slave nodes are coupled to each other via said LIN bus.

10. A slave node for use in a LIN network, comprising:

a level-shift circuit for shifting the voltage of the signals of an incoming message from the LIN network;

a ground-shift circuit for compensating for fluctuations in a ground signal;

a wave-shaping circuit for shaping the signals of the incoming message;

an electronic processing device for interpreting the incoming message; and

a transmitting device for transmitting an outgoing message to the LIN network;

wherein at least one of said level-shift, ground-shift and wave-shaping circuits is integrated into said electronic processing device.

11. The slave node of claim 10, wherein said transmitting device is generally operated in a sleep mode.

12. The slave node of claim 11, wherein said transmitting device is only awakened from said sleep mode when it is transmitting the outgoing message to the LIN network.

13. The slave node of claim 10, wherein said electronic processing device is a digital microcontroller.

14. The slave node of claim 10, wherein said slave node is a glass fog sensor slave node used in conjunction with a vehicle windshield, and further includes an Integrated Glass Fog Sensor (IGFS) unit coupled to said electronic processing device.

15. A LIN network having a LIN bus, a master node, and said slave node of claim 10, wherein said master and slave nodes are coupled to each other via said LIN bus.

16. A Local Interconnect Network (LIN network), comprising:

a LIN bus;

a master node coupled to said LIN bus; and

a slave node coupled to said LIN bus, said slave node comprising;

a level-shift circuit for shifting the voltage of the signals of an incoming message from said LIN bus;

a ground-shift circuit for compensating for fluctuations in a ground reference;

a comparator having a first input terminal coupled to said level-shift circuit and a second input terminal coupled to said ground-shift circuit;

an electronic processing device for interpreting the incoming message; and

a transmitting device for transmitting an outgoing message to the LIN network, said transmitting device is usually maintained in a sleep mode and is coupled to the LIN network;

wherein said electronic processing device interprets the incoming message and only wakes up said transmitting device when it is needed to transmit the outgoing message.