Vehicle deceleration display system and calculation method
First Claim
1. A vehicle deceleration display system comprising:
- a serial data bus operable for communicating a plurality of sequentially measured vehicle speed datums in a respective sequential manner;
a control unit operatively connected to said serial data bus and operable for receiving and processing said vehicle speed data therefrom, wherein said control unit is programmed to sequentially calculate vehicle deceleration values respectively corresponding with said sequential vehicle speed data to provide a variable output signal which corresponds with and varies in accordance with said sequential vehicle deceleration values; and
a variable display operatively connected to said control unit, wherein said variable display varies in response to said output signal.
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Abstract
A vehicle deceleration display system includes a serial data bus operable for communicating a plurality of sequentially-measured vehicle speed datums in a respective sequential manner. A control unit is operatively connected to the serial data bus and is operable for receiving and processing the vehicle speed data therefrom. The control unit is programmed to sequentially calculate vehicle deceleration values respectively corresponding with the sequential speed data to provide a variable output signal. The variable output signal corresponds with and varies in accordance with the sequential vehicle deceleration values. A variable display is connected to the control unit and varies in response to the deceleration values. A method of calculating and displaying vehicle deceleration values is also provided.
22 Citations
20 Claims
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1. A vehicle deceleration display system comprising:
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a serial data bus operable for communicating a plurality of sequentially measured vehicle speed datums in a respective sequential manner;
a control unit operatively connected to said serial data bus and operable for receiving and processing said vehicle speed data therefrom, wherein said control unit is programmed to sequentially calculate vehicle deceleration values respectively corresponding with said sequential vehicle speed data to provide a variable output signal which corresponds with and varies in accordance with said sequential vehicle deceleration values; and
a variable display operatively connected to said control unit, wherein said variable display varies in response to said output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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calculating vehicle deceleration values from sequentially-measured vehicle speed data received via a serial data bus; and
providing an output signal that varies in accordance with said calculated vehicle deceleration values. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method comprising:
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calculating vehicle deceleration values from sequentially-measured vehicle speed data received via a serial data bus, said vehicle speed data including a plurality of sequentially-measured speeds of an output shaft of a transmission;
providing an output signal that varies in accordance with said calculated vehicle deceleration values;
averaging a number of sequentially-calculated vehicle deceleration values to calculate an average deceleration value defined by the formula;
wherein Vn and Vn+1 are consecutively-received vehicle speed data, Vn+1 i being received subsequent to Vn, Tn+1 is the time of reception of Vn+1, Tn is the time of reception of Vn, and N is the number of sequential speed data over which said vehicle deceleration value DecAVG is calculated;
calculating the difference between a first calculated vehicle deceleration value and a second deceleration value, said second deceleration value being calculated based on later sequential speed data than said first deceleration value;
varying said output signal to correspond with said second deceleration value after a first amount of time K1 when said second deceleration value is greater than said first deceleration value by a first amount and after a second amount of time K2 when said second deceleration value is less than said first deceleration by a second amount, wherein K1 is different than K2, such that said output signal varies to correspond with said second deceleration value at a different rate when vehicle deceleration is increasing than when vehicle deceleration is decreasing;
comparing each of said vehicle deceleration values with a minimum threshold value;
setting said output signal to zero when said vehicle deceleration value is less than said minimum threshold value;
recognizing when a vehicle stability event has occurred, said vehicle stability event including at least one of implementation of an anti-lock brake system, implementation of traction control system, occurrence of an understeer event and occurrence of a rollover event; and
setting said output signal to a preset level when occurrence of a vehicle stability event is recognized.
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Specification