103 results about "Steering ratio" patented technology

A steering control apparatus for a vehicle including a steering input unit movable to set a steering input, and a steering output unit arranged to output a steering output, the steering input unit being connected via a cable to a body of the vehicle, includes a steering ratio control unit, a steering limiter, and a cable-attachment diagnostic controller. The steering ratio control unit regulates a variable steering ratio as a rate of change in the steering output with respect to a change in the steering input. The steering limiter restricts movement of the steering input unit to limit the steering input. The cable-attachment diagnostic controller is activated in a cable-attachment diagnostic mode, to control the steering ratio in such a manner that the steering input unit is movable over an allowable region defined by the steering limiter when the cable is correctly attached.

A steering apparatus for an automotive vehicle is provided with an electric drive unit that varies a steering ratio between a road wheel angle and a steering wheel angle of the vehicle, a temperature sensor that detects a temperature of the electric drive unit, and a control unit including a steering ratio characteristic setting block that sets a characteristic of the steering ratio including a steering gain and a steering response rate in accordance with an operating state of the vehicle and, when the temperature of the electric drive unit exceeds a first temperature threshold, adjusts the steering response rate in such a manner that the steering response rate comes closer to a base steering response rate level as the temperature of the electric drive unit becomes increased and a drive block that drives the electric drive unit to vary the steering ratio according to the steering ratio characteristic.

A vehicle steering control device includes an electric power steering unit, a steering ratio varying unit which drives an output member relative to an input member driven by steering operation of a driver to vary a steering ratio, and a control unit which controls the steering ratio varying unit. The control unit decreases in magnitude the relative drive velocity of the output member driven by the steering ratio varying unit relative to the input member when the magnitude of a difference between the maximum value of the steering drive velocity range of said steerable wheels which allows said power steering unit to generate a required steering assisting power and an actual steering drive velocity of said steerable wheels is small in contrast to the large difference.

A steering arrangement (20) including a first hydraulic pressure chamber (31), a second hydraulic pressure chamber (32), a third hydraulic pressure chamber (33) and a fourth hydraulic pressure chamber (34), the first and third pressure chambers (31, 33) being selectively operable to steer in a first direction and the second and fourth pressure chambers (32, 34) being selectively operable to steer in a second direction, a pump system (22) for supplying pressurised fluid to a steering system (24), the steering system (24) being operable to supply the pressurised fluid to one or more of the first, second, third and fourth hydraulic pressure chambers (31, 32, 33, 34), the steering system (24) having a first mode wherein pressurised fluid is simultaneously supplied to the first and third hydraulic pressure chambers (31, 33) to steer in the first direction or wherein pressurised fluid is simultaneously supplied to the second and fourth hydraulic pressure chambers (32, 34) to steer in the second direction, the steering system having a second mode wherein pressurised fluid is supplied to one of the first and third hydraulic pressure chambers (31, 33) to steer in the first direction or wherein pressurised fluid is supplied to one of the second and fourth hydraulic pressure chambers (32, 34) to steer in the second direction, such that the steering ratio is higher in the second mode than in the first mode.

A steering system (10) and a method of dampening the forces transmitted to a steering wheel (20) of a vehicle when a steerable wheel (22) of the vehicle collides with an obstacle using the steering system (10). The method includes steering a vehicle via a steering wheel (20) operably connected to a steerable wheel (22), with the steering wheel (20) defining an input angle. The method also includes monitoring the rate of change of a steering angle (40) as defined by the steerable wheel (22), with the ratio of the input angle to the steering angle (40) defining a steering ratio. The method further includes reducing an amount of torque transmitted to the steering wheel (20) from the steerable wheel (22) when the rate of change of the steering angle (40) exceeds a maximum rate by adjusting the steering ratio (40).

An operation torque estimating portion estimates an operation torque Th of a driver based on an input angle θh and an input torque T output from a torque sensor. A non-holding state detecting portion determines whether the driver is holding a steering wheel by comparing an absolute value of the operation torque Th and a predetermined value ε1. An equilibrium detecting portion determines whether an equilibrium point is reached by comparing the absolute value of the input torque T with a predetermined value ε2. When it is determined that the driver is not holding the steering wheel and the equilibrium point is reached, a switching portion switches to such a position that causes a target steering adjusting portion to multiply a target output angle θ pm by a predetermined gain G according to the input torque T so that the target steering angle is made smaller.

A steering arrangement including a first, second, third and fourth hydraulic chamber, the first and third chambers being operable to steer in a first direction and the second and fourth chambers being operable to steer in a second direction. A pump system supplies fluid to a steering system, which is operable to supply the pressurized fluid to one or more of the first, second, third and fourth hydraulic chambers. The steering system having a first mode wherein fluid is supplied to the first and third hydraulic chambers to steer in the first direction, or pressurized fluid is supplied to the second and fourth hydraulic chambers to steer in the second direction. The steering system having a second mode to steer in the first direction, or to steer in the second direction, such that the steering ratio is higher in the second mode than in the first mode.