Hysteresis of switching from park to drive based on vehicle speed

• US 20040236485A1
• Filed: 05/19/2004
• Published: 11/25/2004
• Est. Priority Date: 05/21/2003
• Status: Active Grant

• Current Assignee: Continental Automotive Systems, Inc. (Continental AG)
• Original Assignee: Continental Automotive Systems, Inc. (Continental AG)
• Inventors: Farrell, Brian, Deniau, Jean-Christophe, Desai, Tejas B., Dash, Sanjaya Kumar
• Granted Patent: US 7,734,391 B2
• Time in Patent Office: Days
• US Class Current: 701/36
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: B60C 23/0433 Radio signals
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/0012 arrangements for identifying the type of modulation
• CPC Class Codes: H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence
• CPC Class Codes: H04L 27/06 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 27/10 Frequency-modulated carrier systems, i.e. using frequency-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 27/14 Demodulator circuits; Receiver circuits

Abstract

A communication for a vehicle (10) has a first transmitter (34) for transmitting a first signal relating to a first vehicle system (22) and a second transmitter (42) for transmitting a second signal relating to a second vehicle system (38). (FIG. 1) A single receiver (46) has a first reception mode (50) and a second reception mode (54). The first reception mode (50) is receptive to the first signal while the second reception mode (54) is receptive to the second signal. A control unit (58) switches the receiver (46) between the first reception mode (50) and the second reception mode (54).

Claims

1. A communication system for a vehicle comprising:

a first transmitter for transmitting a first signal relating to a first vehicle system;

a second transmitter for transmitting a second signal relating to a second vehicle system;

a receiver having a first reception mode and a second reception mode, said first reception mode receptive to said first signal and said second mode receptive to said second signal; and

a control unit for switching said receiver between said first reception mode and said second reception mode.

2. The communication system of claim 1 wherein said first signal is transmitted by an amplitude modulation and said second signal is transmitted by a frequency modulation.

3. The communication system of claim 1 wherein said first vehicle system comprises a remote vehicle port actuation system.

4. The communication system of claim 1 wherein said second vehicle transmitter system comprises a tire pressure monitoring system.

5. The communication system of claim 1 wherein said control unit is programmed to switch between said first reception mode and said second reception mode based upon at least one sensed condition.

6. The communication system of claim 5 wherein said control unit is programmed to switch from said first reception mode to said second reception mode when said at least one sensed condition is at a first value relating to vehicle speed and is programmed to switch from said second reception mode to said first reception mode when said at least one sensed condition is at a second value relating to vehicle speed different from said first value.

7. The communication system of claim 1 wherein said control unit is programmed to detect a first condition relating to a presence of a key in a vehicle ignition and a second condition relating to a gear position of a vehicle transmission, said control unit switching between said first reception mode and said second reception mode based upon said first condition and said second condition.

8. The communication system of claim 1 wherein said control unit is programmed to delay a switch between said first reception mode and said second reception mode.

9. The communication system of claim 1 wherein said control unit is programmed to stay in said second reception mode for a predetermined amount of time following a switch between said first reception mode and said second reception mode.

10. The communication system of claim 1 wherein said control unit is programmed to switch between said first reception mode and said second reception mode upon receipt of a transmitted signal.

11. A communication system for a vehicle comprising:

a first transmitter for transmitting a first signal relating to a remote vehicle port actuation system;

a second transmitter for transmitting a second signal relating to a tire pressure monitoring system;

a receiver having a first reception mode and a second reception mode, said first reception mode receptive to said first signal and said second mode receptive to said second signal; and

a control unit for switching said receiver between said first reception mode and said second reception mode based upon a vehicle speed.

12. The communication system of claim 11 wherein said first signal is transmitted by an amplitude modulation and said second signal is transmitted by a frequency modulation.

13. The communication system of claim 11 wherein said control unit is programmed to control a selection between said first reception mode and said second reception mode.

14. The communication system of claim 11 wherein said control unit is programmed to switch between said first mode and said second mode based upon at least one sensed condition in addition to the vehicle speed.

15. The communication system of claim 14 wherein said at least one sensed condition relates to a presence of a key in a vehicle ignition.

16. The communication system of claim 14 wherein said at least one sensed condition relates to a gear position of a vehicle transmission.

17. The communication system of claim 14 wherein said at least one sensed condition relates to a presence of a key in a vehicle ignition and a gar position of a vehicle transmission.

18. The communication system of claim 11 wherein said control unit is programmed to switch from said first mode to said second mode when said vehicle speed is at a first value and is programmed to switch from said second mode to said first mode when said vehicle speed is at a second value lower than said first value.

19. The communication system of claim 11 wherein said control unit is programmed to detect a first set of conditions and a second set of conditions different from said first set of conditions, said control unit placing said receiver in said first reception mode when said first set of conditions exist and placing said receiver in said second reception mode when said second set of conditions exist.

20. A method of receiving a vehicle signal, comprising the steps of:

providing a receiver on a vehicle having a first reception mode and a second reception mode, the first reception mode for receiving a first signal from a remote vehicle port actuation system and the second reception mode for receiving a second signal from a tire pressure monitoring system, the first signal of a different band than the second signal;

selecting the first reception mode when a first condition exists; and

selecting the second reception mode when a second condition exists, the first condition different from the second condition.