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Research on the matching between electric motor and speed reduction mechanism of electric power steering system He Ren. Miao Lidong. Luo Shi. Shanggao Gao Jiangsu University Key Laboratory of Automotive Engineering. Jiangsu Zhenjiang 212013 movement, and the reasonable matching of the speed reduction mechanism can meet the requirements. In the case of considering the steering function requirements of the car. By analyzing the relationship between the electric fly parameters of the electric power steering system and the speed reduction mechanism, the index of the matching is proposed. According to this, the program of the electric power steering system design is discussed, which guides the development of the electric power steering system. The meaning of the introduction system has a motor and speed reduction mechanism = the main role of the speed reduction mechanism is to increase the motor's assist torque, the greater the reduction ratio, the greater the assist torque, but this is conditional, and will make the same steering The motor speed increases at the disc rotation speed. Flashing this way, when the sweat is driving the power steering system, it is necessary to properly design the speed reduction mechanism so that it matches the motor, otherwise the steering requirements will not be met.
1 The effect of the reduction ratio on the assist performance is the most important parameter of the reduction ratio 圮 reduction mechanism. It has a great impact on the performance of the electric power steering system and the vehicle. Choosing this parameter should consider both the performance index of the motor and the special working conditions of the steering system. The working characteristic of the steering system is that the steering wheel speed is very large, and it can be used as a power steering system from the snake to the number of seconds. Power should be provided within this steering speed range, the minimum requirement being at least not obstructing the steering action.
Fund Project Jiangsu Province Six Talents Summit Project 12002 Jiang can be divided into steering shaft pinion type according to the position of the power assist mechanism of the electric power steering device. Rack type. For the sake of discussion, the most common type of steering shaft electric power steering device at home and abroad is discussed as an example, and other cases can be performed in the same manner. 1 For our steering shaft design 3, it is assisted on the steering shaft. It consists of a torque sensor clutch worm gear reduction drive and a controller. The controller 5, the torque sensor 1 and the vehicle speed sensor control the motor 4 through the clutch 3 and the worm gear reducer 2 to realize the assist 1 torque sensor; 2 worm gear reducer; 3 clutch; 4 motor 5 controller 4 The rotational speed of the motor is called the rotational speed of the steering shaft and the reduction ratio of the assisting mechanism reduction mechanism; the following relationship is obtained.
The duty cycle is determined by the fact that, at 1 o'clock, the maximum assist torque acting on the steering shaft that can be provided under various steering wheel speeds can be obtained as the configuration and function parameters, regardless of the control method.
The following discusses the effects of several parameters. It is assumed that other parameters remain unchanged when discussing the parameters. Before the discussion, first explain the concept. 1 Although these two parameters have different physical meanings here, the essence is one. If different units are used, the two have a simple proportional relationship. In this paper, due to various parameters. The units are all based on basic international units, so it is like this. For the convenience of discussion, K=KT=Ke is a DC power source for cars. Therefore, as the electric motor of the electric power steering system, a DC motor is also used. The motor circuit can use Equation 1 to describe the back electromotive force constant of the motor; and the total resistance of the motor circuit; 1 is the motor armature inductance, which is the rotational speed of the motor; The motor current is especially specified. The bits of each parameter are based on the basic international unit. Since the inductance of the motor is very small, the electromagnetic time constant of the motor is also small, so when the dynamic performance analysis is performed, the existence of the motor can be neglected, that is, it is taken as zero, and thus the equation becomes the motive. The electromagnetic torque can be affected by the type 4. Obviously, as the increase increases linearly, the slope of the decrease is 3, and the thick line in 2 is. In theory, the motor can provide the maximum assist torque during the stalling. It is better to meet this requirement. In practice, at a lower time, the maximum assist torque of the motor is limited by the maximum current allowed by itself. Thin lines, that is, broken thick lines, are not able to appear. Da Jian, owed in the old days, 7 = 0. 〉, then there is a situation of 10, this time the motor can not only provide assistance, but will form resistance, so the indicator of a sage can be called the critical power steering speed. From equation 9, we can get y, = UJKG Q constant. When the motor is at a speed, and the current reaches a relatively stable state, the average current through the motor is determined to be the maximum assist when considering the call. The various design concepts are based on the maximum value. In China, the rotational speed specified by the steering stability test standard is not less than 2,508, while the US 5 test is a small small factory 500; the actual test data shows that driving and driving can be as close as possible to avoid ice. For example, according to the investigation of the National Highway Traffic Safety Administration, when a driver makes an emergency evasion, he can call 4 to 1 or so. The discussion is convenient, and the number is 25, =500 8,=10008. To ensure that half a second per second; J power can be nine llm, good, also to maintain IVl turn, the speed of rotation for the postal time is to take measures on the circuit to prevent the current backflow phenomenon and produce excessive resistance. If the call is made, it is under the control of the driver, so it is OK. The call can also be set up with the relevant number of turns of the hydraulic power assist system to set the electric power steering system. The theoretical flow of hydraulic power steering is also determined according to the call 2, and the flow provided by the actual steering oil pump is 1.52 of the theoretical flow after considering the leakage. 4. According to the data provided in the literature 4, the power steering system of the Audi car is calculated. The maximum steering speed that causes the steering oil pump fuel supply to impede steering is approximately 3.6 curve relationships. Let the solution be illusory, this, the large boosting torque Tsimx that can be reached, one. The reduction of the speed reduction mechanism, the greater the ratio than the 0 and the greater the number of people, the greater the assistance provided. There is a maximum value at the fixed speed. Only a reasonable selection and matching can meet the needs of the high steering wheel speed assist. If you want to call = call 2 can also provide maximum help. In terms of the power of the system, this is a more suitable indicator, such as the discussion of several foreign products, the value is 0.690.660.830.740.850.780.640.64. Remember Lu = double 7, note =, so The unit can be either or not, so it can be called the current assist coefficient. It has obvious physical force. The boost torque provided by the 1-position current is used to pry the steering shaft. Because the range of variation is not large, almost constant, in order to facilitate engineering applications, take =0.7, = 0. Claw. That is, the recognized current provides 0. The boost torque is too large and too small. The power to meet the high-speed rotation of the steering wheel needs to be too small, which will make the motor and control circuit difficult to manufacture. The impact of the increase will be discussed below. Thus, after the required assist torque is determined. The current of the motor can be immediately exchanged according to the value described in 1.
And the impact. According to Equation 9, in each case, the reduction will increase its maximum assisting ability, and it will also reduce and also contribute to energy saving. Therefore, if the reduction of the ruler will provide the 2 design procedure of the electric power conversion system, if it is a new design and development, first of all, according to the requirements of the model, the person who assists is small, and the assistant is small. When the steam year is turning in place, the maximum torque that the driver acts on the steering wheel does not exceed 5.57.5. The requirement of the root training is to remember the power of the motor.
In order to leave the power of the motor should be selected, the maximum torque and the speed 2 on the steering wheel can be used to determine the motor power. The gear ratio 6 is then determined based on the torque of the selected motor, and the magnitude of the check 6 satisfies the return performance, and the base requirement for the 6 and the pair of motors is the low speed fire torque and the speed is fast. A design procedure of 3 can be used.
If the design procedure of the 8 is to modify the existing 0 to meet the needs of the new model, it can be divided into two cases. If the new model requires less power than the existing model, it can be satisfied by adjusting the control rules, no need to change any hardware. If the new model requires more power than the existing model, it will need to be redesigned. If the mechanical properties of the original speed reduction mechanism can meet the requirements, you can choose a more powerful motor to fully meet the requirements. Because the gear ratio has been determined, there is little room for change. It is necessary to increase the rated current of the motive and satisfy the power-seeking.
3 Conclusion Automotive steering system performance relationship driving safety, electric power steering system as a new generation of steering system has a broad development prospect, but there is still no mature theory about the design of this system, unreasonable design often leads to property and even personal Damage, China's upcoming regulations on the recall of defective automotive products, which will be implemented on October 1, 2004, undoubtedly put forward higher requirements for the design of automotive products. By analyzing the matching problem of the electric motor and the speed reduction mechanism of the electric power steering system, this paper points out that only the reasonable matching of the motor and the reduction ratio can meet the needs of the assist; and according to the requirements of the steering system, the matching index is proposed. On this basis, the procedure of setting the juice in the electric power steering system is discussed. This has guiding significance for the development of electric power steering systems.
Gao Guoyu Yu Wen. The principle of automatic control 纟 4. Guangzhou South China University of Technology, Yu Zhisheng. The second edition of the car theory. Beijing Machinery Industry Press, 1990 4 China Automobile Group Corporation. Audi car first edition of Shenzhen. Beijing People's Communications Press, 1998.