An electric power-steering device has a speed-reducing mechanism (17) for reducing the speed of an output shaft (16) of an electric motor (15). The speed-reducing mechanism (17) has an internal gear (39) engaged and rotated with the output shaft (16) and an external gear (40) with which the internal gear (39) internally meshes. A drive pulley (41) rotatable together with the external gear (40) and a driven pulley (42) provided so as to surround a steering shaft are connected by an endless belt (43). Speed reduction is obtained by the internal gear (39) and the external gear (40), and the speed-reducing mechanism (17) as a whole achieves a high reduction ratio without greatly reducing the diameter of the drive pulley (41).

Electric power-steering device

PROBLEM TO BE SOLVED: To reduce fuel consumption since an accelerator pedalling force is increased to be more than a base pedalling force in an area where an accelerator opening is larger than an accelerator opening threshold when a driver steps on an accelerator pedal, and thus the accelerator pedal is suppressed from being excessively stepped on. SOLUTION: The accelerator pedalling force control device increases the pedalling force of the accelerator pedal 2 when the accelerator opening is larger than the accelerator opening threshold. The device takes the first accelerator opening threshold when the driver starts increasing the opening degree of the accelerator pedal 2, and the car speed is low. The device takes the second accelerator opening threshold which is relatively large when the car speed is high. In a low car speed area, the pedalling force of the accelerator pedal 2 is increased from the small accelerator opening, and the accelerator pedal 2 is suppressed from being excessively stepped so as to reduce the fuel consumption. In a middle-high car speed area, a driving force of the vehicle is reduced and a travel resistance is increased when the accelerator is fully open, however smooth acceleration is achieved by setting the accelerator opening threshold to be relatively large. COPYRIGHT: (C)2010,JPO&INPIT

Accelerator pedalling force control device

A steering device for a vehicle includes a first sun gear connected to a steering member, a second sun gear which is operated according to operation of the steering member and connected to a steering mechanism for turning vehicle wheels, a first planet gear which is meshed with the first sun gear, and a second planet gear which is rotated integrally with the first planet gear and meshed with the second sun gear The steering device is constructed in such a manner that at least one of the first and second sun gears is a profile shifted gear, and the first and second planet gears are formed as a cylindrical body which has internal teeth of the same number at both end parts thereof

Steering device for vehicle

An object of the present invention is to reduce the possibility of a power assistance failure because of the phenomenon that steering assisting power which an electric power steering unit can generate is lower than the steering assisting power which is required for the electric power steering unit. A vehicle steering control device comprises 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 means which controls the steering ratio varying unit. The control means 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.

Vehicle steering control device

PROBLEM TO BE SOLVED: To provide technology to suppress wasteful power consumption on a vehicle control device of a vehicle adopting a steer-by-wire method SOLUTION: This vehicle control device is furnished with a first actual steering angle detection part to detect a first actual steering angle of a wheel steered by a first motor 24L for steering, a second actual steering angle detection part to detect a second actual steering angle of the wheel steered by a second motor for steering, a first steering control part 30 to control output of the first motor 24L for steering and a second steering control part to control output of the second motor for steering in accordance with deflection of the second actual steering angle and a target steering angle The first steering control part 30 receives a parameter value used for control of the second motor for steering, compares a parameter value which it has itself and the other parameter value with each other and corrects its own parameter value so as to reduce a difference between them when the difference between both of them is more than a prescribed value COPYRIGHT: (C)2010,JPO&INPIT

Vehicle control device

PROBLEM TO BE SOLVED: To provide a traveling road recognition device for vehicle, capable of rationally estimating a state quantity, even in presence of a noise and precisely estimating the state quantity without making sudden changes in the state quantity. SOLUTION: This device comprises a CCD camera 101 for taking the image of the road scene in the front of a vehicle; a pre-processing part 102 for performing a uniform processing to the whole screen of the image signal from the CCD camera; a lane marker detecting small area set part 103 for setting a plurality of small areas for detecting a lane marker on the input screen; a straight line detection part 104 for detecting a part of the lane marker to the small areas; a lane marker candidate point detection part 105, for verifying that the straight detection result by the straight detection part is a part of the lane marker; and a road model parameter calculating part 106 for calculating the road model parameter for showing the road shape in the front of the vehicle on the basis of the detection result of the lane marker. The road model parameter calculation part 106 comprises an extension Kalman filter, having time and spatial continuity and stochastic rationality for parameter determination.

Traveling road recognition device for vehicle

PROBLEM TO BE SOLVED: To provide a steering gear for a vehicle which facilitates recognition of the neutral position and steering angle of a steering means in a low μ road and allows an easy driving operation. SOLUTION: In a steer by wire system where a steering wheel 1 is not mechanically connected to a steering mechanism 5, a controller 14 compensates and controls a reaction force motor 2 so that a steering reaction force for returning the steering wheel angle to the neutral direction is generated according to the angle of the steering wheel 1 when the road surface friction coefficient is a predetermined value or lower. COPYRIGHT: (C)2005,JPO&NCIPI

Steering gear for vehicle

PROBLEM TO BE SOLVED: To provide a steering control unit for a vehicle which easily performs a track adjustment steering for the vehicle, while reducing an irregular feeling in steering operation against a driver SOLUTION: This steering-by-wire type steering control device for a vehicle comprises a gear ratio setting unit 10a for setting a gear ratio Δθ/Δδ that is a ratio between a variation of a steering angle θof the steering wheel 1 and a variation of a steering angle δof each of the steering wheels 5, 5, and a steering angle controller 10 for driving a steering actuator 8 in the way that there is provided a target steering angle δ* calculated on the basis of at least set gear ratio Δθ/Δδ and a steering angle θ The gear ratio setting unit 10a is defined as means for setting a gear ratio characteristic B where the gear ratio Δθ/Δδbecomes low while holding a zone in which the gear ratio Δθ/Δδ becomes constant as an absolute value of the steering angle θ is increased COPYRIGHT: (C)2005,JPO&NCIPI

Steering control unit for vehicles

PROBLEM TO BE SOLVED: To provide a vehicle steering device formed in a multi-system arrangement consisting of a main steering drive system M, a sub-steering drive system S, etc., capable of achieving a stable vehicle steering without bringing about a mutual interference. SOLUTION: The vehicle steering device formed in multi-system arrangement includes a control means furnished with an operating force presumption part to presume the operating force generated by actuators on the basis of the sensor output, a turbulence presumption part to presume the turbulence applied to the system externally by comparing the control output value fed to the actuators actually with the obtained operating force presumptive value, and a feedback computer having a turbulence compensation part to adjust the control output so as to cancel the presumed turbulence, wherein the control means computes the control output value upon assuming the actuators as one integrated actuator. COPYRIGHT: (C)2004,JPO&NCIPI

Multiple-system vehicle steering device

PROBLEM TO BE SOLVED: To provide a multiplex system servo actuator controller for preventing the antagonism of actuators without changing a generation force as the multiplex system servo actuator system. SOLUTION: This multiplex system servo actuator controller for outputting a set of values as the total of the outputs of actuators(12, 22, to n2) to the outside is provided with an actuator antagonism detecting means for preliminarily detecting that a certain actuator has an antagonism relation with another actuator and an actuator antagonism prevention control means for, when it is detected that the actuators (12, 22, to n2) are put in the antagonism relation, deciding the command values of the actuators (12, 22, to n2) in order not to change a generation force as the multiplex system actuator system while compensating the antagonism relation. COPYRIGHT: (C)2005,JPO&NCIPI

Multiplex system servo actuator controller

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