Actuator for vehicle body stabilisation system

FIELD: transport.

SUBSTANCE: device of vehicle body stabilisation system is made as linear electromechanical transducer (LEMT) and has magnetised integral cylindrical core, magnetised hollow cylinder, at least two electromagnetic coils and linear servo. The cylindrical core is made of constant magnet, connected with unsprung masses, located inside coils to interact with their internal field and has axial magnetisation. The hollow cylinder is made of constant magnet, connected with unsprung masses, located outside coils to interact with their external field and has axial magnetisation. The electromagnetic coils are located in series along actuator operation axis, connected with sprung masses and winded so that when current flows over them their magnetic poles are oriented axially - along device operation axis. Linear servo is performed with stepped motor resistant to axial loads, located in series with LEMT and intended for processing system low frequency signals and changing vehicle clearance.

EFFECT: vehicle service in extreme environmental conditions, improvement of travelling comfort, roadability and safety, reducing shock loads on chassis elements.

7 cl, 6 dwg

 

The invention relates to the stabilization systems of the body of a vehicle and used when driving on road surfaces with different roughness, as well as overcoming major irregularities, commensurate with the size of the wheel (the hump "speed bumps"), and, in particular, to the Executive devices of such systems in the form of a linear Electromechanical transducers. The process of controlling the position of the body by controlling the characteristics of the actuators is carried out continuously.

The prior art stabilization system of the body controlled by the electronic controller with the original electromagnetic actuators consisting of a group of nodes associated with the unsprung mass, a group of nodes associated with the sprung mass, and the only power node, which produces a controlled force, leading to stabilization of the body (see US 4892328, publ. 09.01.1990). Option actuating devices of this system is shown in figure 1, where it consists of a group of nodes associated with the unsprung mass (30), a group of nodes associated with the sprung mass (110), and a single power node (position 70, 80, 90), which produces a controlled force, leading to stabilization of the body, where the position 70 is a guide rod associated with podres the adopted mass, position 80 is a permanent magnet rigidly connected with a rod, and the position of the 90 electromagnetic coil associated with the unsprung mass.

The main features of the system is the following: 1) permanent magnet of cylindrical shape (80) radially magnetized so that the North pole is on the outer side of the magnet, and the South on the inside. The current passing through the coil between it and the permanent magnet, a magnetic interaction, leading to a force tending to move the parts relative to each other. System through a computer controls the magnitude and direction of the current of the coil controlling the relative movement of the sprung and unsprung masses. 2) the Algorithm of control system based on the use of sensor absolute displacement (linear voltage Converter or similar).

The disadvantage of this system is the only power node, which indicates a pronounced asynchronous nature of the work item, which imposes restrictions on certain modes of the system that require timing. The strength of the interaction is non-linear, depending on the spindle stroke (because of the location of the only power element in the middle) and has a more springy than the damping, the nature of the dynamic characteristics that are not within the same concept of stabilization. Not used external field coil that reduces the efficiency of the device.

Closest to the proposed invention is the stabilization system, the execution unit which is a highly efficient multiphase stepper linear motor (see Figure 2), under computer control (see US 4981309, publ. 01.01.1991). In the actuator of this type the power offset is created through the interaction of permanent magnets (142), integrated in the rod (131) and associated with the sprung masses, and coils (146)on the outside of the magnets in the housing (132) and the associated unsprung masses. The main features of the system is the following: 1) permanent magnets have a rectangular shape with alternating polarity to ensure operation of the displacement sensor; 2) the displacement sensor is an absolute sensor move". Its output signal is formed by using gray code or similar means; 3) the algorithm of control system based on the use of sensor absolute displacement; 4) the design of the coils and the method of winding is not described in this patent. However, in all known synchronous and linear stepper motors are used coils with cores.

The disadvantage of this system is the lack of zero resistance is ellenia relative displacement at zero current in the coils. This is due to the likely presence in the design of the coil cores, which, in the field of permanent magnets that are magnetized and begin to interact with the latter. Also, a pronounced synchronous mode of the device, which imposes restrictions on the modes of the system where you want asynchronicity.

Both described systems also has the following disadvantages: high cost, dimensions and lower the reliability of the applied absolute displacement sensors (same as production). Shortness of changes in clearance vehicles without additional energy costs (the need to constantly overcome the resistance of the spring suspension).

The task of the invention consists in the creation of the Executive device for the stabilization systems of the body vehicles that have the following characteristics: independence working parameters of the device from the ambient temperature, the insensitivity to work in dirty or dusty environments, as well as the ability to perform the function of stabilizing the body of the vehicle in the complete absence of working fluids and gases. The use of such devices as part of the stabilization systems will allow you to operate the vehicle in extreme climatic conditions, improve the th smoothness, patency and safety of the vehicle, to reduce the shock load on the chassis members, etc.

The problem is solved by using the stabilization system based on the application as actuators linear Electromechanical converters (LAMP). The Executive unit of the stabilization system of the body of the vehicle, made in the form of LAMP has a magnetized solid cylindrical core, the magnetized hollow cylinder, at least two electromagnetic coils and linear servo.

According to the invention a cylindrical core made of a permanent magnet associated with unsprung masses, is located inside the coils to interact with their internal field and has an axial magnetization; a hollow cylinder made of a permanent magnet associated with unsprung masses, is located on the outside of the coils to interact with their external field and has an axial magnetization; electromagnetic coils arranged in series along the axis of the Executive device associated with the sprung mass and wound so that when current flows through them their magnetic poles are oriented axially along the axis of operation of the device; a linear actuator made with stepper motor, resistant to axial loads that is consistent is consequently with LAMP and is designed to handle low frequency signals and changes the clearance of the vehicle; there is also a movement sensor built into the device and used to control the degree of contraction and stretching of the device.

In particular, the displacement sensor is an absolute sensor type.

In particular, the displacement sensor is a sensor relative type. In particular, the servo is located on top of the device. In particular, the servo is located on the underside of the device.

In particular, the magnetized hollow cylinder, the core and coil Assembly commensurate with each other in height.

In particular, the magnetized hollow cylinder integrated in the housing and located at the same height as the core relative to the base device.

The construction of the actuating devices can be used where the use of other analogues is limited or impossible for reasons of layout or operating characteristics. Thus, the geometric parameters of the device are of simple shape without corners, so you can use them in the suspensions of traditional design without significant changes. Also, depending on the task being performed, the device allows you to implement any of the three modes: synchronous, asynchronous or synchronous-asynchronous. The proposed variant of the device with the combined use of linear EMF (3.2) and Prasat the high EMF (3.3), connected in series (see Figg)), is able to solve most of the tasks such as combined devices analogues listed in figure 3 (a), b), C) and d), processing of low-frequency signals and change clearance, but is distinguished by ease of implementation.

Figure 4 (a), b) and C) shows that the body (3.1) of the vehicle, the servo (3.3) and the Assembly of coils (4.1) represent a group of nodes of the sprung mass and the chassis (3.4) of the vehicle, the rod (4.2), the magnetized hollow cylinder (4.3) and the case (4.4) actuators represent a group of nodes unsprung masses. Between them is the spring (3.5), which specifies the mean position of the body (3.1) and assume all of its mass. Between the rod (4.2) and coil Assembly (4.1), as well as between the Assembly of coils (4.1) and the case (4.4) with an integrated magnetized hollow cylinder (4.3), there is no mechanical connection and there are air gaps (S1) and (S2), allowing the mass to move freely relative to each other.

Assembly of coils (4.1) consists of coaxially located two or more coils, each of which is oriented so that the current passing through them with one of the poles will be at the top, another at the bottom.

Case (4.4) of the Executive device has a tubular shape, made of paramagnetic material and contains a permanent magnet (4.3) Paula cylindricus the second form, magnetized similarly to the magnet core (one pole at the top, the other below). Magnetized hollow cylinder (4.3), core (4.5) and each coil (4.6) from the Assembly of coils (4.1) is commensurable with each other in height. Magnetized hollow cylinder (4.3) integrated in the housing (4.4) and is located approximately at the same height relative to the base device, and the core (4.5). Magnetized hollow cylinder (4.3) is designed to interact with external fields coils (4.6).

Rod (4.2) device is made of a paramagnetic material and includes a core (4.5) of a powerful permanent magnet. Core (4.5) is designed to interact with the inner field coils (4.6). Consistent inclusion of one or more coils (4.6), changing the amount of current in them and its direction, as a result of interaction between the field coils (4.6) with the fields of the permanent magnet core (4.5) and the outer magnet hollow cylindrical form (4.3) creates a force that separates or unites the sprung and unsprung masses. Group parts: coil (4.6), core (4.5) and magnetized hollow cylinder (4.3) can be called a power module.

This arrangement of the parts of the power module is the main distinguishing feature of the proposed actuator. Its main idea is that the ISOE is lovanii magnetic field outside the solenoid (coil). It is believed that the external field of an infinitely long solenoid is zero. However, as the reduction of its lineage size field is redistributed to the outside. Figure 6 presents the model fields of the solenoids of different geometrical dimensions.

As can be seen from Fig.6, the external magnetic field is short and broad solenoid) significantly redistributed outside. From the description of the patent analogues can be seen that in the construction of actuators for reasons of layout used coil, similar in configuration to some intermediate options b) or C) Fig.6. The external field of the coils is not used. It is small, but has a significant effect, which will be used in the actuator of the proposed system. Thus, in the design of magnetic systems without cores it is possible to obtain the advantage of the greater efficiency of the device.

Also between the Assembly of coils (4.1) and the body (3.1) is present stepper servo (3.3) of the rotary type, which can increase or decrease the distance between the wheel "AL" and LEN (3.2) (Figure 4), which in turn leads to a gradual change in the length of the entire actuator system and change the clearance vehicle. Stepper servo (3.3) excludes the possibility of an asynchronous operation, so the distance between the vehicle body (3.1) and coil Assembly (4.) LAMP always known with high precision.

Also, the actuator has a sensor (4.7) of the relative movement, the locking relative movement of the sprung and unsprung masses.

The stabilization system must have at least another sensor (5.1, Fig 5) vehicle speed (and other sensors). Thus, the minimum set of sensors includes a sensor (4.7) the relative movement of the masses and the sensor (5.1) the speed of the vehicle.

During operation of the system (see Figure 5) electronic unit (5.2) control based on the signals of the sensor system according to a certain algorithm generates control signals to the actuators to stabilize the fluctuations in the body (3.1) of the vehicle or control its position.

It happens this way. When hitting an obstacle, such as artificial roughness, due to the fact that the inertia of a body is much higher inertia of the unsprung mass, the latter begin to move towards convergence with the body (3.1), overcoming the spring force. Knowing the speed of movement of the vehicle, which is determined using the sensor (5.1) the speed of the vehicle, the relative speed of convergence of the mass, which is determined by the sensor (4.7) of the relative movement, and on the basis of the initially present in the computer memory constants (values podrecca the military and unsprung masses, the stiffness of the springs, tires, etc.) computer or control unit (5.2) generates control signals for actuators (5.3), the purpose of which is to hold the calculated vertical displacements of the vehicle body and their derivatives within certain limits, as appropriate. While high - and mid-frequency signals are addressed to the Assembly of the coils (4.1) actuators, and low-frequency signals (shares of Hertz and below) and the signals for changes in the clearance of TC are addressed to the rotary servo (3.3).

Addressing control signals and control the powerful currents of the coils occurs when using power modules (5.4).

Due to the separation of frequencies becomes possible to handle them with greater efficiency and greater range (the same effect is reached, for example, when designing speaker systems, distributing the sound of different frequencies to the speakers of different sizes).

1. The Executive unit of the stabilization system of the body of the vehicle, made in the form of a linear Electromechanical transducer (LAMP)having a magnetized solid cylindrical core, the magnetized hollow cylinder, at least two electromagnetic coils and a linear actuator, wherein the cylindrical core is made of a permanent magnet associated with unsprung masses, R is spoelgen inside the coils to interact with their internal field and has an axial magnetization; the hollow cylinder is made of a permanent magnet associated with unsprung masses, is located on the outside of the coils to interact with their external field and has an axial magnetization; electromagnetic coils arranged in series along the axis of the Executive device associated with the sprung mass and wound so that when current flows through them their magnetic poles are oriented axially along the axis of operation of the device; a linear actuator made with stepper motor, resistant to axial load is placed in series with LAMP and is designed to handle low frequency signals and changes the clearance of the vehicle; further comprises a displacement transducer that is built into the device and designed to control the degree of contraction and stretching of the device.

2. The device according to claim 1, characterized in that the displacement sensor is an absolute sensor type.

3. The device according to claim 1, characterized in that the displacement sensor is a sensor relative type.

4. The device according to claim 1, characterized in that the servo is on top of the device.

5. The device according to claim 1, characterized in that the servo is located on the underside of the device.

6. The device according to claim 1, characterized in that the magnetized hollow cylinder, the core and each of the second coil of the coil Assembly commensurate with each other in height.

7. The device according to claim 1, characterized in that the magnetized hollow cylinder integrated in the housing and located at the same height as the core relative to the base device.



 

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