A steering control device restrains not only a steered angle but also a steering angle from exceeding their upper limit values. A maximum value selection circuit selects a maximum value of a target steered angle and a target steering angle as an end angle and outputs the end angle to a limiting reaction force setting circuit. The limiting reaction force setting circuit increases a limiting reaction force rapidly if the end angle becomes equal to or larger than a common threshold. A target steering angle setting circuit sets a target steering angle based on torque applied to the steering minus the limiting reaction force etc. A steering angle control circuit sets reaction torque as a manipulated variable for feedback controlling the steering angle to the target steering angle. An operation signal generation circuit outputs an operation signal to a reaction force motor so as to achieve the reaction torque.

The present invention relates to a steer-by-wire and independent-drive integrated wheel-side electric drive device, including a first double-rotor motor and a second double-rotor motor, fixedly arranged coaxially along an axial direction of a motor, an inner rotor of the first double-rotor motor is connected with a first drive shaft and is used for driving a wheel on one side to rotate; an inner rotor of the second double-rotor motor is connected with a second drive shaft and is used for driving a wheel on the other side to rotate; an outer rotor of the first double-rotor motor and an outer rotor of the second double-rotor motor are respectively connected with a driving gear by virtue of an output shaft.

Provided is a steering system capable of enhancing traveling stability when a vehicle drives straight and improving small-turn performance. The steering system includes: a first steering device; a second steering device including a mechanical section configured to individually steer each of left and right wheels by driving a steering actuator and a control section configured to control the steering actuator; and a vehicle information detection section configured to detect a velocity of the vehicle and a steering angle. The control section includes a turning angle control module configured to control the steering actuator pursuant to a predetermined rule in accordance with the velocity of the vehicle and the steering angle so as to control turning angles of the left and right wheels.

Provided is a steering system capable of enhancing traveling stability when a vehicle drives straight and improving small-turn performance. The steering system includes: a first steering device; a second steering device including a mechanical section configured to individually steer each of left and right wheels by driving a steering actuator and a control section configured to control the steering actuator; and a vehicle information detection section configured to detect a velocity of the vehicle and a steering angle. The control section includes a turning angle control module configured to control the steering actuator pursuant to a predetermined rule in accordance with the velocity of the vehicle and the steering angle so as to control turning angles of the left and right wheels.

A wheel suspension system (101) with at least one wheel support (103), first and second coupling rods (105, 107) and at least one track rod (109). The first and second coupling rods (105, 107) are connected to one another in an articulated manner. The second coupling rod (107) and the wheel support (103) are connected to one another in an articulated manner. The track rod (109) is designed to apply a steering torque to the first coupling rod (105). The steering torque is transmitted from the first coupling rod (105), via the second coupling rod (107), to the wheel support (103). The wheel suspension system has at least one suspension link (111) which is mounted, in an articulated manner, on a vehicle body or chassis and is articulated to the wheel support (103). The suspension link (111) and the first coupling rod (105) are articulated to one another.

A wheel suspension system (101) with at least one wheel support (103), first and second coupling rods (105, 107) and at least one track rod (109). The first and second coupling rods (105, 107) are connected to one another in an articulated manner. The second coupling rod (107) and the wheel support (103) are connected to one another in an articulated manner. The track rod (109) is designed to apply a steering torque to the first coupling rod (105). The steering torque is transmitted from the first coupling rod (105), via the second coupling rod (107), to the wheel support (103). The wheel suspension system has at least one suspension link (111) which is mounted, in an articulated manner, on a vehicle body or chassis and is articulated to the wheel support (103). The suspension link (111) and the first coupling rod (105) are articulated to one another.

It is an object of the present invention to provide a rear wheel steering device of which the weight is not added to unsprung weight, and which can steer right and left rear wheels independently of each other. The rear wheel steering device includes a first rod connected to the left rear wheel, a first driving portion configured to axially move the first rod, a second rod connected to the right rear wheel, and a second driving portion configured to axially move the second rod. A single housing supports the first rod, the first driving portion, the second rod, and the second driving portion.

It is an object of the present invention to provide a rear wheel steering device of which the weight is not added to unsprung weight, and which can steer right and left rear wheels independently of each other. The rear wheel steering device includes a first rod connected to the left rear wheel, a first driving portion configured to axially move the first rod, a second rod connected to the right rear wheel, and a second driving portion configured to axially move the second rod. A single housing supports the first rod, the first driving portion, the second rod, and the second driving portion.

Systems for controlling the speed and direction of vehicles such as tractors, including vehicles that have low to zero turning radius capability. Systems include steering and speed coordination systems that control the direction and speed of rotation of vehicle drive units.

Systems for controlling the speed and direction of vehicles such as tractors, including vehicles that have low to zero turning radius capability. Systems include steering and speed coordination systems that control the direction and speed of rotation of vehicle drive units.