Wireless vehicle parameter monitoring system

A vehicle parameter monitoring system comprising:

• at least one parameter sensor;
• at least one transmitter coupled to said parameter sensor for transmitting a first radio frequency signal;
• a receiver for receiving said first radio frequency signal when in an operational mode and, when in a training mode for receiving a second radio frequency signal transmitted by a remote transmitter used to actuate a device;
• a signal detector coupled to said receiver for detecting a presence of said received first radio frequency signal;
• a controller coupled to said receiver and said signal detector, for selecting and generating a warning signal in an operational mode in response to said first radio frequency signal, and identifying and storing the carrier frequency, data format, and data code of a second radio frequency signal in a training mode;
• and
• a transmitter coupled to said controller for transmitting a third radio frequency signal having the carrier frequency, data format, and data code of said second radio frequency signal to remotely actuate the device.

A vehicle parameter monitoring system comprising:

• a plurality of parameter sensors, each for sensing one of a plurality of monitored parameters;
• a plurality of transmitters each coupled to a corresponding one of said parameter sensors, for transmitting a radio frequency signal having a carrier frequency uniquely associated with the corresponding one of said parameter sensors;
• and
• a receiver for receiving the radio frequency signals, said receiver including at least one signal detector for detecting a presence of a received radio frequency signal, and a microprocessor, coupled to said signal detector for selecting a warning signal based upon carrier frequency of the received radio frequency signal and generating the selected warning signal in response to the detected presence of the received radio frequency signal by said signal detector to identify the status of a particular sensor.

A tire pressure monitoring system for a vehicle comprising:

• at least one pressure sensor located in a tire of a vehicle;
• at least one transmitter located in the tire and coupled to said pressure sensor for transmitting a radio frequency signal having a carrier frequency that is varied in relation to the sensed tire pressure;
• and
• a receiver for receiving the radio frequency signal, said receiver including a control circuit for detecting the carrier frequency of the received radio frequency signal and for selecting and generating a message signal based upon the detected carrier frequency of the received radio frequency signal.

A vehicle tire pressure monitoring system comprising:

• at least one tire pressure sensor located in a tire of a vehicle;
• at least one transmitter coupled to said tire pressure sensor for transmitting a signal representing the pressure sensed by said tire pressure sensor;
• and
• a control circuit coupled to a system bus of the vehicle for receiving the signal transmitted from said transmitter and determining the pressure sensed by said tire pressure sensor based upon the received signal and for governing the speed of the vehicle when the sensed tire pressure reaches a predetermined level.

A vehicle parameter monitoring system comprising:

• at least one parameter sensor for sensing a condition of a vehicle parameter;
• at least one transmitter coupled to said parameter sensor for transmitting a signal having a carrier frequency that is varied in relation to the sensed condition of the vehicle parameter;
• and
• a receiver for receiving the signal, said receiver including a control circuit for detecting the carrier frequency of the received signal, starting a timer upon a first detection of the received signal, determining whether the signal is continuously detected for at least a predetermined period of time, and for selecting and generating a message signal based upon the detected carrier frequency of the received radio frequency signal when the signal is continuously detected for at least the predetermined period of time.