CN2803861Y

CN2803861Y - Electric boosting steering system

Info

Publication number: CN2803861Y
Application number: CN 200520028626
Authority: CN
Inventors: 王德平; 杨兴旺; 郑德双
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2005-05-11
Filing date: 2005-05-11
Publication date: 2006-08-09
Anticipated expiration: 2015-05-11

Abstract

The utility model relates to an electric boosting steering system which comprises a steering wheel, a steering input shaft, a speed reducing mechanism, a steering output shaft, a steering engine, a transverse steering draw rod, a motor, an electronic controller and a detecting device, wherein the detecting device comprises a vehicle speed sensor, a revolution speed sensor for an engine, and an ignition switch; the electronic controller is used for processing and calculating signals which are detected by the detecting device, and calculating current or voltage acting on the motor according to the ideal force characteristics and the variation curve of the lateral acceleration of the steering wheel which is stored in the electronic controller. A driving circuit causes the motor to generate corresponding driving moment, and after the torque is increased by the deceleration of the speed reducing mechanism, the torque and the steering force of a driver together act on the steering output shaft. The utility model is characterized in that the detecting device also comprises a lateral acceleration sensor and a torque rotation angle sensor of the steering wheel, and the torque rotation angle sensor of the steering wheel is directly connected with one end of the steering input shaft. The utility model has the advantages that the system can apply the implement boosting force according to the running condition and the traffic surface of a vehicle, the good traffic feeling can be realized at high speed, the stability of the vehicle is improved in a driving way and the aligning response of the system is accurate and quick.

Description

Electric boosting steering system

Technical field

The utility model belongs to automobile steering system, particularly is used for the electric boosting steering system of vehicle.

Background technology

Automobile electric booster steering system is on the basis of manual steering gear, according to the information such as torque that act on the steering handwheel,, make motor produce the auxiliary force of corresponding size by electronic control package, assist chaufeur to carry out handling maneuver, and obtain the Fu of good cornering properties.Mostly present disclosed electric boosting steering system is to determine the power-assisted size according to torque on the steering handwheel and vehicle speed signal, its shortcoming is that the power-assisted size does not change with condition of road surface, for example for the vehicle of same speed of operation, when it walks on ice face and good cement pavement, if give the same deflection angle of vehicle, cooresponding vehicle lateral response is different, and chaufeur is different to the good power sense of different vehicle lateral response, and the power-assisted that existing system provides is identical, this not only makes chaufeur can not obtain optimum power sense, turn to loss of stability but also may cause vehicle to be crossed.In addition, the returnability of existing system is also relatively poor, and is although obtained certain improvement by some approach, also not very good.

Summary of the invention

The purpose of this utility model provides the deficiency that can overcome on the prior art, increasing less cost or do not adding under the condition of cost, improve the turning efficiency and the stability of vehicle, both guaranteed the portability of vehicle when low speed, realized vehicle good road feel when high speed again.

The utility model comprises steering handwheel, turn to input shaft, speed reduction gearing, turn to output shaft, steering box, tierod, electrical motor, electronic controller, detecting device, steering handwheel is connected with turning to input shaft, the scroll bar of speed reduction gearing is connected with the output shaft work of electrical motor, the turbine of speed reduction gearing is connected with turning to output shaft, turn to output shaft to be connected with steering box, steering box is connected with tierod, detecting device comprises car speed sensor, engine speed sensor and ignition lock, car speed sensor is used for the collection vehicle speed signal, engine speed sensor is used to gather engine rotational speed signal, ignition lock provides working state signal to electronic controller, electrical motor also is connected with electronic controller work, electronic controller is used for handling, calculate the signal that detecting device detects, and according to being stored in the steering handwheel ideal force characteristic in the electronic controller and the change curve of the speed of a motor vehicle and lateral acceleration, calculate the curtage that acts on the electrical motor, pass through driving circuit again, make electrical motor produce corresponding driving moment, and slow down to increase by speed reduction gearing and turn round the back and turning on the output shaft together with the operating effort combined action of chaufeur

It is characterized by: described detecting device also comprises lateral acceleration sensor, steering-wheel torque rotary angle transmitter, the lateral acceleration sensor is used to detect the lateral acceleration of vehicle, the steering-wheel torque rotary angle transmitter is used to detect the torque and the corner of steering handwheel, the steering-wheel torque rotary angle transmitter with turn to input shaft one end direct connection.

Electric boosting steering system is characterized by: the described end of input shaft that turns to is made spline and steering-wheel torque rotary angle transmitter direct connection.

Electric boosting steering system is characterized by: the described end of input shaft that turns to is made keyway and steering-wheel torque rotary angle transmitter direct connection.

Advantage of the present utility model is: compare with other electric boosting steering systems with hydraulic power-assist steering system, have following advantage: system can implement optimum power-assisted according to vehicle running state and condition of road surface, make system not only can alleviate the chaufeur burden, and good road feel can realize high speed the time, improved the stability of vehicle on one's own initiative, and system returns and just responds accurately, rapidly.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model control unit structured flowchart.

Specific embodiments

Describe specific embodiments of the present utility model in detail below in conjunction with accompanying drawing.

Embodiment 1:

The utility model comprises steering handwheel 1, turn to input shaft 2, speed reduction gearing 4, turn to output shaft 5, steering box 6, tierod 7, electrical motor 8, electronic controller 9, detecting device, steering handwheel 1 is connected with turning to input shaft 2, the scroll bar of speed reduction gearing 4 is connected with the output shaft work of electrical motor 8, the turbine of speed reduction gearing 4 is connected with turning to output shaft 5, turn to output shaft 5 to be connected with steering box 6, steering box 6 is connected with tierod 7, detecting device comprises car speed sensor 13, engine speed sensor 11 and ignition lock 10, car speed sensor 13 is used for the collection vehicle speed signal, engine speed sensor 11 is used to gather engine rotational speed signal, ignition lock 10 provides working state signal for electronic controller 9, electrical motor 8 also is connected with electronic controller 9 work, electronic controller 9 is used for handling, calculate the signal that detecting device detects, and according to being stored in the steering handwheel ideal force characteristic in the electronic controller 9 and the change curve of the speed of a motor vehicle and lateral acceleration, calculate the curtage that acts on the electrical motor 8, pass through driving circuit again, make electrical motor 8 produce corresponding driving moment, and slow down to increase by speed reduction gearing 4 and turn round the back and turning on the output shaft 5 together with the operating effort combined action of chaufeur, it is characterized by: described detecting device also comprises lateral acceleration sensor 12, steering-wheel torque rotary angle transmitter 3, lateral acceleration sensor 12 is used to detect the lateral acceleration of vehicle, steering-wheel torque rotary angle transmitter 3 is used to detect the torque and the corner of steering handwheel, and the described end of input shaft 2 that turns to is made spline and steering-wheel torque rotary angle transmitter 3 direct connections.

Embodiment 2:

Steering handwheel 1 of the present utility model is connected with turning to input shaft 2, the scroll bar of speed reduction gearing 4 is connected with the output shaft work of electrical motor 8, the turbine of speed reduction gearing 4 is connected with turning to output shaft 5, turn to output shaft 5 to be connected with steering box 6, steering box 6 is connected with tierod 7, detecting device comprises car speed sensor 13, engine speed sensor 11 and ignition lock 10, car speed sensor 13 is used for the collection vehicle speed signal, engine speed sensor 11 is used to gather engine rotational speed signal, ignition lock 10 provides working state signal for electronic controller 9, electrical motor 8 also is connected with electronic controller 9 work, electronic controller 9 is used for handling, calculate the signal that detecting device detects, and according to being stored in the steering handwheel ideal force characteristic in the electronic controller 9 and the change curve of the speed of a motor vehicle and lateral acceleration, calculate the curtage that acts on the electrical motor 8, pass through driving circuit again, make electrical motor 8 produce corresponding driving moment, and slow down to increase by speed reduction gearing 4 and turn round the back and turning on the output shaft 5 together with the operating effort combined action of chaufeur, it is characterized by: described detecting device also comprises lateral acceleration sensor 12, steering-wheel torque rotary angle transmitter 3, lateral acceleration sensor 12 is used to detect the lateral acceleration of vehicle, steering-wheel torque rotary angle transmitter 3 is used to detect the torque and the corner of steering handwheel, and the described end of input shaft 2 that turns to is made keyway and steering-wheel torque rotary angle transmitter 3 direct connections.

Concrete working process is: when automobile begins to turn to, steering-wheel torque rotary angle transmitter 3 detection effect are turning to the torque on the input shaft 2 and the size of corner, car speed sensor 13 detects the moving velocity of vehicle, lateral acceleration sensor 12 detects the side direction vehicle dynamics of vehicle, engine speed sensor 11 detection of engine tach signals, ignition lock 10 provides working signal, and these signals are sent in the electronic controller 9 together, electronic controller 9 is at first gathered and filtering by signal processing circuit 14, send to microprocessor 15 then, microprocessor 15 is again with reference to motor current 17 and supply current 16, utilize the software in its internal memory to judge, processing such as comparison and calculating, the export target current signal, the target current signal converts target voltage signal to by distributor circuit 18 and exports to driving circuit 19, driving circuit 19 is by PWM control bridge 20, driving motor 8, produce moment, and by speed reduction gearing 4 slow down increase turn round the back together with the operating effort combined action of chaufeur on deflector output shaft 5, testing circuit 21 feeds back to microprocessor 15 with failure message simultaneously, if discovery fault, by not under command light circuit 22, driving malfunction indicator lamp 23 is glittering.After turning to end, chaufeur to discharge steering handwheel 1, electronic controller 9 calculates the corresponding driving curtage according to detected angle position and comes driving motor 8, makes steering swivel system get back to midway location.

Claims

1, electric boosting steering system comprises steering handwheel (1), turn to input shaft (2), speed reduction gearing (4), turn to output shaft (5), steering box (6), tierod (7), electrical motor (8), electronic controller (9), detecting device, steering handwheel (1) is connected with turning to input shaft (2), the scroll bar of speed reduction gearing (4) is connected with the output shaft work of electrical motor (8), the turbine of speed reduction gearing (4) is connected with turning to output shaft (5), turn to output shaft (5) to be connected with steering box (6), steering box (6) is connected with tierod (7), detecting device comprises car speed sensor (13), engine speed sensor (11) and ignition lock (10), car speed sensor (13) is used for the collection vehicle speed signal, engine speed sensor (11) is used to gather engine rotational speed signal, ignition lock (10) provides working state signal for electronic controller (9), electrical motor (8) also is connected with electronic controller (9) work, electronic controller (9) is used for handling, calculate the signal that detecting device detects, and according to being stored in the interior steering handwheel ideal force characteristic of electronic controller (9) and the change curve of the speed of a motor vehicle and lateral acceleration, calculate the curtage that acts on the electrical motor (8), pass through driving circuit again, make electrical motor (8) produce corresponding driving moment, and slow down to increase by speed reduction gearing (4) and turn round the back and turning on the output shaft (5) together with the operating effort combined action of chaufeur

It is characterized by:

Described detecting device also comprises lateral acceleration sensor (12), steering-wheel torque rotary angle transmitter (3), lateral acceleration sensor (12) is used to detect the lateral acceleration of vehicle, steering-wheel torque rotary angle transmitter (3) is used to detect the torque and the corner of steering handwheel, steering-wheel torque rotary angle transmitter (3) with turn to input shaft (2) one end direct connections.

2, electric boosting steering system according to claim 1 is characterized by: the described end of input shaft (2) that turns to is made spline and steering-wheel torque rotary angle transmitter (3) direct connection.

3, electric boosting steering system according to claim 1 is characterized by: the described end of input shaft (2) that turns to is made keyway and steering-wheel torque rotary angle transmitter (3) direct connection.