Toyota Jidosha Kabushiki Kaisha

Aisin Seiki Kabushiki Kaisha

Akira Kasamatsu

Yuji Iwase

Mitsuhiro Nada

Hiroatsu Endo

Akira Murakami

Tatsuya Ozeki

Mitsuhiro Umeyama

Hideyuki Kobayashi

Hisanori Nomoto

Nobuyuki Nagashima

Hideo Mizukoshi

A hydraulic pressure control apparatus for stabilizers controls hydraulic fluid in a hydraulic communication path hydraulically connecting cylinders each operatively connected to each stabilizer of a vehicle. The apparatus includes a spool valve provided in the hydraulic communication path. The spool valve includes a housing, a spool accommodated in the housing, first and second spool chambers defined by the spool and the housing, and a biasing member for biasing the spool. The apparatus further includes first, second, and third hydraulic communication passages, hydraulically connecting an accumulator hydraulically connected to the second spool chamber and the hydraulic communication path, hydraulically connecting the first spool chamber and the hydraulic communication path, and hydraulically connecting the spool chamber and the accumulator respectively, first, second, and third solenoid valves provided in the first, second, and third hydraulic communication passages respectively, and a control device for controlling the first, second and third valves.

Fluid pressure control apparatus for stabilizers

In a suspension system () for use in a vehicle including a body, left and right front wheels (), and left and right rear wheels (), a front-wheel-associated cylinder device () which controls a relative displacement of the left and right front wheels, and a rear-wheel-associated cylinder device () which controls a relative displacement of the left and right rear wheels are associated with each other with a working fluid. A first-chamber-associated valve () is provided in a first-chamber-associated passage () which connects between respective first chambers () of the front-wheel-associated cylinder device and the rear-wheel-associated cylinder device, such that the first-chamber-associated valve is located between the first chamber of the front-wheel-associated cylinder device and a first fluid accommodating device ().

Suspension system of vehicle

A vehicular suspension system having a fluid circuit including two fluid cylinders provided on respective front-wheel and rear-wheel sides, and two fluid passage systems one of which connects one of two fluid chambers of the fluid cylinder on the front-wheel side to the corresponding one of the two fluid chambers of the fluid cylinder on the rear-wheel side, and the other of which connects the other fluid chamber of the front-wheel side fluid cylinder to the other fluid chamber of the rear-wheel side fluid cylinder, the suspension system including a diagnosing device operable to diagnose the fluid circuit for any abnormality, on the basis of at least one of fluid pressures in the two fluid passage systems.

Vehicular suspension system

A first hydraulic pump and a second hydraulic pump are respectively mounted to both ends of a rotary shaft in an electric motor, whereby it is possible to drive both of the first hydraulic pump and the second hydraulic pump by one electric motor. Since the electric motor is driven and controlled so as to have any higher rotational speed among a rotational speed of the first hydraulic pump for obtaining an amount of working fluid required in a hydraulic control circuit for a power steering apparatus and a rotational speed of the second hydraulic pump for obtaining an amount of working fluid required in a hydraulic control circuit for a power train by a hydraulic pump drive controlling portion, it is possible to necessarily and sufficiently secure the working fluids respectively required in the power steering hydraulic control circuit and the power train hydraulic control circuit which are independent from each other, by a little electric power consumption.

Hydraulic control apparatus of vehicle and control method

Growing community of inventors

Toyota, Japan

Akira Kasamatsu