Hitachi Astemo Ltd.

Yuichiro Minakuchi

Masaki Izawa

Vaibhav Gupta

The present invention achieves a technology that enables estimating a ground contact load in a vehicle with sufficiently high accuracy. A ground contact load estimation device according to the present invention is configured to estimate a ground contact load of a vehicle by: acquiring a wheel angular velocity, a steady load, and an inertial load of the vehicle; calculating a first gain using the steady load and the inertial load; estimating a road surface load using the first gain, a prescribed vehicle specification, and a second gain representing a hysteresis characteristic of a tire installed on the vehicle and referencing said road surface load.

Ground contact load estimation device, vehicle control device, and ground contact load estimation method

The present invention achieves a technique that not only makes it possible to reduce sensor-related cost but also makes it possible to estimate a ground contact load of a vehicle with sufficiently high accuracy. A ground contact load estimation device () causes an acquisition section to acquire a physical quantity related to a vehicle, causes a reference inertia load calculation section () to calculate a reference inertia load with use of the physical quantity, uses the physical quantity to cause a correction value calculation section () to calculate an inertia load correction value, and causes an inertia load estimation section () to estimate an inertia load by adding the inertia load correction value to the reference inertia load.

Grounding load estimation device, control device, and grounding load estimation method

A suspension control device which controls an operation of a suspension of a vehicle includes an operation-induced state quantity estimation portion which estimates an operation-induced state quantity caused by an operation of a vehicle, a road surface-induced state quantity estimation portion which estimates a road surface-induced state quantity caused by a road surface, an operation-induced state quantity conversion portion which converts the operation-induced state quantity into an operation-induced required damping force, a road surface-induced state quantity conversion portion which converts the road surface-induced state quantity into a road surface-induced required damping force, and a current value calculation portion which determines a current value to be applied to the suspension with reference to the operation-induced required damping force and the road surface-induced required damping force.

Suspension control device, vehicle, and suspension control method

The present invention achieves a technique that makes it possible to estimate a ground contact load of a vehicle with sufficiently high accuracy. A ground contact load estimation device () acquires a wheel angular speed, a steady load, and an inertia load of a vehicle, uses the steady load and the inertia load to cause a first gain calculation section () to calculate a first gain, multiplies a variation in wheel angular speed by a second gain so as to cause a tire effective radius variation calculation section () to calculate a tire effective radius variation, and multiplies the tire effective radius variation by the first gain so as to estimate a road surface load.

Ground load estimation device, control device, and ground load estimation method

It is an object of the present invention to improve accuracy in estimation of a state of a vehicle in order to achieve excellent ride comfort. An ECU () includes a reference vehicle model computation section (), which is configured to calculate a reference output by carrying out computation with respect to at least one of a plurality of state amounts in a planar direction and at least one of a plurality of state amounts in an up-down direction in an inseparable manner.

Suspension control device and suspension device

It is an object of the present invention to suitably estimate a state of a vehicle. A vehicle state estimation section () includes: a main computation section () configured to carry out linear computation with respect to a state amount related to a state of a vehicle; and a tire model computation section () configured to carry out nonlinear computation with direct or indirect reference to at least part of a result of the linear computation carried out by the main computation section ().

Growing community of inventors

Tochigi, Japan

Yuichiro Minakuchi