Restraint and fuel system cutoff control module
First Claim
1. A method of discriminating between a normal power interruption to a restraint control module and a collision induced power interruption to the restraint control module comprising:
- setting a digital input bit of a microprocessor in a first state when a normal power interruption occurs;
monitoring by the microprocessor for power interruption to the restraint control module while powered;
monitoring an algorithm programmed into the microprocessor that checks sensor output data to determine whether a collision event has occurred, and upon determination that a power interruption has occurred checking the algorithm to determine whether the power interruption occurred during a collision event, setting the digital input bit to a second state to indicate that the power interruption occurred during a collision event, and preventing powering up of a system of the vehicle controlled by the microprocessor when the digital bit is in the second state.
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Accused Products
Abstract
A restraint and fuel pump cutoff control system is disclosed wherein a restraint control module controls the restraint system such as an air bag deployment system and a fuel system power supply based upon data inputs from sensors positioned at various locations on the vehicle. When data received from the sensors indicates that a collision event has occurred and has reached the predetermined level of severity, power to the fuel system is cut off to prevent undesired pumping of fuel. If power is interrupted during a collision event, the fuel system will be cut off and remain cut off until reset by turning the ignition switch to off and then to run/start indicating a clean shutdown. The restraint control module utilizes collision data profiles to distinguish between power shutdowns occurring during a collision event and power shutdowns occurring when only background data is being received from the sensors.
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Citations
12 Claims
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1. A method of discriminating between a normal power interruption to a restraint control module and a collision induced power interruption to the restraint control module comprising:
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setting a digital input bit of a microprocessor in a first state when a normal power interruption occurs;
monitoring by the microprocessor for power interruption to the restraint control module while powered;
monitoring an algorithm programmed into the microprocessor that checks sensor output data to determine whether a collision event has occurred, and upon determination that a power interruption has occurred checking the algorithm to determine whether the power interruption occurred during a collision event, setting the digital input bit to a second state to indicate that the power interruption occurred during a collision event, and preventing powering up of a system of the vehicle controlled by the microprocessor when the digital bit is in the second state. - View Dependent Claims (2, 3, 4, 5)
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6. A combined restraint control and fuel system cutoff control module for a vehicle, comprising:
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a restraint control module connected to a power supply when an ignition switch of the vehicle is in its on position and start position, the restraint control module having a microprocessor that is programmed with an algorithm that is used to detect a collision event;
at least one sensor that provides acceleration/deceleration data to the microprocessor;
the microprocessor controlling deployment of restraints and fuel system cutoff based upon analysis by the algorithm of acceleration/deceleration data received by the microprocessor, the microprocessor monitoring whether the connection of the restraint control module to the power supply is interrupted and whereupon the microprocessor further determines whether the interruption occurred during a collision even or is a normal power interruption, if it is determined that the interruption occurred during a collision event, the microprocessor enables the fuel system cutoff until the ignition switch is manipulated by an operator to reset the fuel system cutoff. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification