Active safety suspension system
In some embodiments, a rapid-response active suspension system controls suspension force and position for improving vehicle safety and drivability. The system may interface with various sensors that detect safety critical vehicle states and adjust the suspension of each wheel to improve safety. Pre-crash and collision sensors may notify the active suspension controller of a collision and the stance may be adjusted to improve occupant safety during an impact while maintaining active control of the wheels. Wheel forces may also be controlled to improve the effectiveness of vehicle safety systems such as ABS and ESP in order to improve traction. Also, bi-directional information may be communicated between the active suspension system and other vehicle safety systems such that each system may respond to information provided to the other.
1. A method of operating a vehicle that includes an active suspension system, with at least one actuator, and an electronically controllable steering system, the method comprising:
(a) receiving data from at least one sensor about a road disturbance;
operating the at least one actuator to mitigate an effect of the road disturbance on a vertical motion of the vehicle, wherein the operation of the at least one actuator also induces a steering effect; and
(c) operating the electrically controllable steering system to mitigate the steering effect.
2. The method of claim 1 , wherein the electrically controllable steering system is selected from the group consisting of an electric power steering system, an active steering system, a rear steering system, an electro-hydraulic power steering system, a combination of the electric power steering system and the active steering system, and a combination of the power steering system, the active steering system, and the rear steering system.
3. The method of claim 1 , wherein the electrically controllable steering system comprises an electric power steering system.
4. The method of claim 1 , wherein the steering effect comprises slaloming of the vehicle.
5. The method of claim 1 , further comprising predicting the steering effect based at least partially on a model of the active suspension system.
6. The method of claim 5 , wherein the model is selected from the group consisting of an empirical model, a mathematical model and a combination empirical and mathematical model.
7. The method of claim 1 , wherein the steering effect is predicted based at least partially on a vehicle model.
8. The method of claim 7 , wherein the steering effect is further predicted based on an output of a steering behavior model.
9. A vehicle, comprising:
an active suspension actuator;
an electrically controllable steering system; and
a controller;
wherein the controller is configured to operate the active suspension actuator to mitigate an effect of a road induced disturbance, and wherein the electrically controllable steering system is configured to receive a signal from the controller and, based on that signal, to mitigate a steering effect induced by the operation of the active suspension actuator.
10. The vehicle of claim 9 , further comprising a sensor positioned and configured to collect information about the road induced disturbance.
11. The vehicle of claim 10 , wherein the sensor is selected from the group consisting of an accelerometer, a pressure sensor, and a position sensor.
12. A method of operating a power steering system of a vehicle, the method comprising:
(a) receiving information about a state of an active suspension system of the vehicle;
(b) determining an effect of the state of the active suspension system on the steering behavior of the vehicle; and
(c) operating the power steering system to at least partially mitigate the effect determined in step (b).
13. The method of claim 12 , wherein the information is based at least in part on a sensor measurement of the state of the active suspension system.
14. The method of claim 13 , wherein the sensor measurement is obtained by a sensor configured to measure a quantity at least one selected from the group of: a position, a velocity and an acceleration of a vehicle wheel with respect to a body of the vehicle.
15. The method of claim 14 , wherein the information is received from an actuator of the active suspension system.
16. The method of claim 12 , wherein the effect in step (b) is determined with a model.
17. The method of claim 16 , wherein the model is a predictive model of the active suspension system.
18. The method of claim 12 , wherein the information is based at least in part on information received from an active suspension controller.