Active suspension with structural actuator
First Claim
1. A strut actuator for a vehicle suspension, comprising:
- a hydraulic motor-pump with a first port and a second port;
an electric motor-generator drivingly connected to said hydraulic motor-pump;
a strut actuator comprising a cylinder divided into a rebound volume and a compression volume by a piston, with an attached piston rod, slidably received in said cylinder wherein said rebound volume is in fluid communication with said first port and said compression volume is in fluid communication with said second port;
a fluid reservoir; and
a flow control system means for fluidly connecting said reservoir to one of said first port and said second port with lower pressure;
wherein said strut actuator is configured to withstand forces applied in a direction that is transverse to the longitudinal axis of said actuator.
9 Assignments
0 Petitions
Accused Products
Abstract
An active suspension system is configured in a strut arrangement. The active suspension system comprises a hydraulic actuator and a hydraulic pump/electric motor assembly, wherein the actuator movement is preferably in lockstep with the hydraulic motor-pump and electric motor-generator combination. Torque in the electric motor is instantaneously controlled by a controller to create an immediate force change on the hydraulic actuator. The hydraulic actuator is configured so that it can be used as a strut whereby the actuator has sufficient structural rigidity to carry the applied suspension loads while capable of supplying damper forces in at least three quadrants of the force velocity graph of the suspension actuator operation. Embodiments disclosed include low cost active suspension systems for a MacPherson strut application.
255 Citations
27 Claims
-
1. A strut actuator for a vehicle suspension, comprising:
-
a hydraulic motor-pump with a first port and a second port; an electric motor-generator drivingly connected to said hydraulic motor-pump; a strut actuator comprising a cylinder divided into a rebound volume and a compression volume by a piston, with an attached piston rod, slidably received in said cylinder wherein said rebound volume is in fluid communication with said first port and said compression volume is in fluid communication with said second port; a fluid reservoir; and a flow control system means for fluidly connecting said reservoir to one of said first port and said second port with lower pressure; wherein said strut actuator is configured to withstand forces applied in a direction that is transverse to the longitudinal axis of said actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
Specification