Abstract:
A method for transmitting the value of a parameter in a compressed form, the method comprising the steps of: accepting successive numbers representing the value of a parameter; manipulating each number, the manipulation comprising placing the number in a form comprising a mantissa and an exponent, and defining a transmission mantissa to be transmitted; transmitting to a receiver, in turn, the transmission mantissas only of the successive numbers; and receiving the transmission mantissas of the successive numbers at the receiver, characterised by the steps of maintaining a record, at the receiver, of a receiver variable, the receiver variable initially corresponding to the exponent of an initial number; formulating at the receiver, for each received transmission mantissa, a reconstructed number comprising at least the transmission mantissa and an exponent corresponding to the receiver variable; and altering the receiver variable in a first manner if the transmission mantissa of the current number fulfils a first criterion, or altering the receiver variable in a second manner if the transmission mantissa of the current number fulfils a second criterion.
Abstract:
A vehicle safety arrangement having a sensor unit (7) comprising at least one sensor (8, 9) responsive to acceleration; an actuator (13) for activating a safety device, the actuator being located remotely from the sensor unit; and a control unit (2) located remotely from the sensor unit and from the actuator, the control unit having no sensors responsive to acceleration and being operable to receive information from the sensor unit and to transmit an actuating command to the actuator to activate the safety device.
Abstract:
A safety arrangement for a motor vehicle, comprises sensor (21, 22) to sense acceleration and a control system to control a triggering circuit (24) which is adapted to actuate or deploy a safety device in the form of an air-bag (27). The control system incorporates a processor (23) which has an input for activating a non-maskable interrupt (NMI) routine (31). An input (30) from the processor (23) which carries a command signal generated by the processor in response to a predetermined output from the sensors (21, 22) is connected an input which activates the NMI routine (31). The routine is designed to determine whether there are hardware and/or software thoughts that may invalidate the command, and to interrupt actuation or deployment of the safety device if any such fault is detected.
Abstract:
A method for transmitting the value of a parameter in a compressed form, the method comprising the steps of: accepting successive numbers representing the value of a parameter; manipulating each number, the manipulation comprising placing the number in a form comprising a mantissa and an exponent, and defining a transmission mantissa to be transmitted; transmitting to a receiver, in turn, the transmission mantissas only of the successive numbers; and receiving the transmission mantissas of the successive numbers at the receiver, characterised by the steps of maintaining a record, at the receiver, of a receiver variable, the receiver variable initially corresponding to the exponent of an initial number; formulating at the receiver, for each received transmission mantissa, a reconstructed number comprising at least the transmission mantissa and an exponent corresponding to the receiver variable; and altering the receiver variable in a first manner if the transmission mantissa of the current number fulfils a first criterion, or altering the receiver variable in a second manner if the transmission mantissa of the current number fulfils a second criterion.
Abstract:
A vehicle safety arrangement having a sensor unit (7) comprising at least one sensor (8, 9) responsive to acceleration; an actuator (13) for activating a safety device, the actuator being located remotely from the sensor unit; and a control unit (2) located remotely from the sensor unit and from the actuator, the control unit having no sensors responsive to acceleration and being operable to receive information from the sensor unit and to transmit an actuating command to the actuator to activate the safety device.