Vehicle hood hinge assembly
A hinge assembly is provided to lift a hood of a vehicle relative to a vehicle body in anticipation of, during, or right after a collision has occurred to cushion contact with a pedestrian. The hood selectively covers a compartment of the vehicle when in a secured position. The hinge assembly includes a hinge configured to guide the hood from the secured position to both of an open position or to a pedestrian deployment position relative to the vehicle body. An actuator moves the hood from the secured position to the pedestrian deployment position. A controller controls the actuator based at least in part on a characteristic of the pedestrian.
1 . A method for controlling a vehicle hood hinge assembly, comprising:
receiving, by a controller, a first signal indicative of an imminent or occurred pedestrian collision;
receiving, by the controller, a second signal indicative of a wrap around distance of the pedestrian;
determining, by the controller, a deployment height for a hood based on the wrap around distance; and
actuating the hood to the determined deployment height prior to head impact of the pedestrian with the hood.
2 . The method of claim 1 , further comprising:
determining an expected head impact time (HIT) based on the wrap around distance; and
wherein actuating the hood includes moving the hood to the deployment height within a time frame based on the expected head impact time.
3 . The method of claim 1 , wherein the wrap around distance is determined based on a characteristic of the pedestrian detected by a sensor.
4 . The method of claim 3 , wherein the characteristic of the pedestrian includes at least one of a height, a width, a weight, a position of the pedestrian relative to the vehicle, or an orientation of the pedestrian relative to the vehicle.
5 . The method of claim 1 , further comprising:
accessing a lookup table that maps pedestrian characteristics to deployment parameters; and
determining the deployment height based on the lookup table.
6 . The method of claim 1 , wherein actuating the hood includes activating a multi-stage actuator coupled to a hinge assembly of the hood.
7 . The method of claim 1 , further comprising:
detecting a reduction in the deployment height due to body loading of the pedestrian; and
adjusting operation of an actuator to compensate for the detected reduction.
8 . The method of claim 1 , wherein the first signal is received from at least one of an optical sensor, a camera, LiDAR, radar, an accelerometer, or a pressure sensor.
9 . The method of claim 1 , further comprising:
engaging a locking mechanism when the hood reaches the deployment height to maintain the hood at the deployment height during impact with the pedestrian.
10 . The method of claim 9 , wherein the locking mechanism includes at least one of a tab engaging a slot or a stop pin engaging a keyway.
11 . A vehicle safety system, comprising:
a hood configured to selectively cover a compartment;
a multi-stage actuator coupled to the hood;
a sensor configured to detect body loading of a pedestrian during a collision; and
a controller configured to:
determine an initial deployment position for the hood;
detect, via the sensor, a reduction in the deployment position due to body loading of the pedestrian; and
adjust operation of the multi-stage actuator to compensate for the detected reduction in deployment position.
12 . The vehicle safety system of claim 11 , wherein the controller is further configured to determine the initial deployment position based on a characteristic of the pedestrian.
13 . The vehicle safety system of claim 12 , wherein the characteristic of the pedestrian includes a wrap around distance of the pedestrian.
14 . The vehicle safety system of claim 11 , wherein the controller is further configured to:
access a lookup table that maps pedestrian characteristics to deployment parameters; and
determine the initial deployment position based on the lookup table.
15 . The vehicle safety system of claim 11 , wherein the multi-stage actuator is configured to move the hood to the initial deployment position at a rate determined based on an expected head impact time.
16 . The vehicle safety system of claim 11 , further comprising a locking mechanism configured to maintain the hood at the initial deployment position during impact with the pedestrian.
17 . The vehicle safety system of claim 16 , wherein the locking mechanism includes at least one of a tab engaging a slot or a stop pin engaging a keyway.
18 . The vehicle safety system of claim 11 , wherein the sensor includes at least one of an optical sensor, a camera, LiDAR, radar, an accelerometer, or a pressure sensor.
19 . The vehicle safety system of claim 11 , wherein the controller is further configured to:
determine a time frame for moving the hood to the initial deployment position based on a wrap around distance of the pedestrian; and
control the multi-stage actuator to move the hood within the determined time frame.
20 . The vehicle safety system of claim 11 , wherein the controller is further configured to select between a plurality of deployment positions based on a characteristic of the pedestrian.