Vehicular suspension system
First Claim
1. A suspension system for a vehicle, characterized by comprising:
- a fluid circuit including (a) at least one fluid cylinder provided on each of a front-wheel side and a rear-wheel side of the vehicle, each of said at least one fluid cylinder including a housing, and a piston which separates an interior space of the housing into two fluid chambers, said each fluid cylinder being disposed between a wheel-side member of the vehicle and a body-side member of the vehicle, such that there arises a difference between fluid pressures in said two fluid chambers when at least one of a left wheel and a right wheel is displaced in a vertical direction relative to a body of the vehicle, and (b) two fluid passage systems one of which connects one of the two fluid chambers of said at least one fluid cylinder on said front-wheel side to a corresponding one of the two fluid chambers of said at least one fluid cylinder on said rear-wheel side, and the other of which connects the other of the two fluid chambers of said at least one fluid cylinder on said front-wheel side to the other of the two fluid chambers of said at least fluid cylinder on said rear-wheel side; and
a diagnosing device operable to diagnose said fluid circuit on the basis of at least one of fluid pressures in said two fluid passage systems.
1 Assignment
0 Petitions
Accused Products
Abstract
The object of this invention is to detect an abnormality of a roll-motion restricting device including a hydraulic circuit.
It is possible to determine that a fluid leakage takes place if actual fluid pressure in fluid passages 72, 74 connecting the corresponding fluid chambers of front-wheel-side hydraulic cylinder 30 and rear-wheel-side hydraulic cylinder 60 is lower than a value determined by a lateral acceleration value of a vehicle. On the basis of a relationship between a state of rolling of the vehicle and the fluid pressure, the hydraulic circuit can be diagnosed for any abnormality. In the event of detection of an abnormality, solenoid-operated shut-off valves 100, 102 are closed to isolate the two hydraulic cylinders 30, 60 from each other, and isolate one of the hydraulic cylinders or a portion of the fluid passage, which suffers from the fluid leakage, from the other hydraulic cylinder, so that this other hydraulic cylinder can generate a fluid pressure difference depending upon the rolling state of the vehicle, enabling a stabilizer bar to generate a resilient force, whereby the deterioration of a roll-motion restricting effect can be made smaller, than in the case where the two hydraulic cylinders are disabled to normally function.
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Citations
21 Claims
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1. A suspension system for a vehicle, characterized by comprising:
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a fluid circuit including (a) at least one fluid cylinder provided on each of a front-wheel side and a rear-wheel side of the vehicle, each of said at least one fluid cylinder including a housing, and a piston which separates an interior space of the housing into two fluid chambers, said each fluid cylinder being disposed between a wheel-side member of the vehicle and a body-side member of the vehicle, such that there arises a difference between fluid pressures in said two fluid chambers when at least one of a left wheel and a right wheel is displaced in a vertical direction relative to a body of the vehicle, and (b) two fluid passage systems one of which connects one of the two fluid chambers of said at least one fluid cylinder on said front-wheel side to a corresponding one of the two fluid chambers of said at least one fluid cylinder on said rear-wheel side, and the other of which connects the other of the two fluid chambers of said at least one fluid cylinder on said front-wheel side to the other of the two fluid chambers of said at least fluid cylinder on said rear-wheel side; and
a diagnosing device operable to diagnose said fluid circuit on the basis of at least one of fluid pressures in said two fluid passage systems. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20)
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17. A suspension system for a vehicle, characterized by comprising:
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a fluid circuit including (a) at least one fluid cylinder provided on each of a front-wheel side and a rear-wheel side of the vehicle, each of said at least one fluid cylinder including a housing, and a piston which separates an interior space of the housing into two fluid chambers, said each fluid cylinder being disposed between a wheel-side member of the vehicle and a body-side member of the vehicle, such that there arises a difference between fluid pressures in said two fluid chambers when at least one of a left wheel and a right wheel is displaced in a vertical direction relative to a body of the vehicle, and (b) two fluid passage systems one of which connects one of the two fluid chambers of said at least one fluid cylinder on said front-wheel side to a corresponding one of the two fluid chambers of said at least one fluid cylinder on said rear-wheel side, and the other of which connects the other of the two fluid chambers of said at least one fluid cylinder on said front-wheel side to the other of the two fluid chambers of said at least one fluid cylinder on said rear-wheel side;
a separating device operable to separate said fluid circuit into two parts; and
a separating-device control device operable to control said separating device on the basis of at least one of fluid pressures in said two fluid passage systems. - View Dependent Claims (18, 19, 21)
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Specification