APPARATUSES AND METHODS FOR WIRELESS AUTOMATIC OPERATION OF AN AERODYNAMIC DRAG REDUCTION DEVICE
A latch for an aerodynamic structure is provided. The latch includes a transceiver and antenna coupled to a processor that receives signals indicative of speed. The processor causes the latch driver to be energized to release the latch to deploy the aerodynamic structure.
1 . An apparatus comprising:
a latch movable between a hold and a release position wherein the latch is operatively configured to hold a member from an aerodynamic device in the hold position and releases the member in the release position; and
a latch driver electrically coupled to the latch, the latch driver comprising a transceiver and a processor where the processor is configured to determine whether an actual speed of a vehicle to which the latch driver is attached exceeds a threshold speed and to generate a control signal causing the latch to transition from the hold position to the release position when the actual speed is equal to or exceeds the threshold speed and to maintain the latch in the hold position when the actual speed is less than the threshold speed, the processor generating an alert signal when the latch has been moved to the release position.
2 . The apparatus of claim 1 further comprising,
a speed sensor to generate a signal indicative of the actual speed of the vehicle, the speed sensor comprising a processor and a transmitter wherein the transmitter transmits the signal indicative of the actual speed to the latch driver.
3 . The apparatus of claim 2 wherein the speed sensor comprises a radar speed sensor.
4 . The apparatus of claim 2 wherein the speed sensor comprises a wheel speed sensor.
5 . The apparatus of claim 2 wherein the speed sensor comprises a hub odometer.
6 . The apparatus of claim 5 wherein the hub odometer comprises at least one dual axis accelerometer.
7 . The apparatus of claim 1 further comprising,
an indicator having a first state and a second state that is operatively positioned to be viewable by an operator of the vehicle, the indicator including a receiver to receive the alert signal and transition from the first state to the second state on reception of the alert signal such that the operator is alerted to the release of the aerodynamic device.
8 . The apparatus of claim 1 wherein the latch driver comprises:
a power source outputting a first voltage;
a voltage boost circuit coupled to the power source by a first switch and configured to output a second voltage greater than the first voltage;
a high voltage capacitor coupled to the voltage boost circuit; and
a second switch to selectively couple the high voltage capacitor to the latch when the high voltage capacitor is charged causing the latch to move to the release position,
wherein the voltage boost circuit is coupled to the power source when the processor determines the actual speed of the vehicle is above a threshold speed such that the high voltage capacitor is charged by the second voltage output from the voltage boost circuit.
9 . The apparatus of claim 8 wherein the latch driver further comprises:
a discharge circuit;
a third switch; and
a power regulator,
wherein the third switch selectively couples the output of the high voltage capacitor to the power regulator after the latch is moved to the release position.
10 . The apparatus of claim 9 wherein the power regulator is electrically coupled to at least the processor to provide power to the processor from either the power source or the output of the discharge circuit.
11 . The apparatus of claim 5 wherein the hub odometer is an electric hub odometer.
12 . The apparatus of claim 5 wherein the hub odometer is a mechanical hub odometer.
13 . The apparatus of claim 1 , wherein the latch driver is electrically coupled to an active actuator to cause the active actuator to at least one of actuate or de-actuate.