Device, method and system for measuring steering efficiency

Abstract

The invention provides a device, method and system for measuring steering efficiency, and belongs to the technical field of vehicles, and the device comprises a first measurement assembly which is connected with the first end of a rack; the second measuring assembly is connected with the second end of the rack; the third measuring assembly is connected with the steering motor; the measuring module is connected with the first measuring assembly, the second measuring assembly and the third measuring assembly and is configured to determine the output power of the rear wheel steering system based on the moving speed and the load force and determine the input power of the rear wheel steering system based on the rotating speed of the steering motor; and determining an efficiency of the rear wheel steering system based on the input power and the output power. According to the device, the rotating speed of the steering motor can be obtained, the input power of the rear wheel steering system is determined based on the rotating speed of the steering motor, the input power does not need to be determined through the input torque of the steering wheel, and therefore measurement of the steering efficiency of the rear wheel steering system is achieved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular, to a device, method and system for measuring steering efficiency. Background Art

[0002] The steering system is a system used to control the steering of the wheels. It can be divided into front-wheel steering system and rear-wheel steering system according to the position of the controlled wheels. The front-wheel steering system achieves steering through the driving of the steering wheel input torque. The relevant technology can measure the steering efficiency of the front-wheel steering system through the steering wheel input torque and the rack output force.

[0003] However, in the rear-wheel steering system, steering is achieved entirely by controlling the steering motor through the vehicle message without input torque from the steering wheel. Therefore, related technologies cannot measure the steering efficiency of the rear-wheel steering system. Summary of the invention

[0004] Based on this, the present application provides a device, method and system for measuring steering efficiency to solve the problem of how to measure the steering efficiency of a rear-wheel steering system.

[0005] According to a first aspect of an embodiment of the present application, there is provided a device for measuring steering efficiency, the device being applied to a rear-wheel steering system, the rear-wheel steering system comprising a steering motor and a rack connected to the steering motor, the steering motor being used to drive the rack to move; the device comprising: a first measuring assembly connected to the first end of the rack and configured to measure a movement rate of the rack; a second measuring assembly connected to a second end of the rack different from the first end and configured to measure a load force borne by the rack; a third measuring component, connected to the steering motor and configured to measure a rotation speed of the steering motor; The measurement module is connected to the first measurement component, the second measurement component and the third measurement component respectively, and is configured to determine the output power of the rear-wheel steering system based on the moving speed and the load force, determine the input power of the rear-wheel steering system based on the rotational speed of the steering motor; and determine the efficiency of the rear-wheel steering system based on the input power and the output power.

[0006] Optionally, the second measuring component comprises: a load force sensor and a hydraulic cylinder, wherein the load force sensor and the hydraulic cylinder are respectively connected to the measuring module; The hydraulic cylinder is connected to the second end of the rack, and the load force sensor is arranged on the side of the rack; The load force sensor is configured to measure the load force borne by the rack; The hydraulic cylinder is configured to apply a force to the rack in a direction opposite to the moving direction of the rack when the rack moves, so as to simulate the force of the wheel on the rack.

[0007] Optionally, the first measuring component includes: a reflector, a laser generator and a laser receiver; The reflector is fixed to the first end and is configured to move synchronously with the rack; The laser generator and the laser receiver are both separated from the rack and are configured to remain stationary during the movement of the rack; The laser generator is configured to emit laser light toward the reflector; The reflector is configured to reflect the laser light toward the laser receiver; The laser receiver is configured to receive the laser reflected by the reflector; The moving speed is determined based on the time when the laser generator emits the laser and the time when the laser receiver receives the laser.

[0008] Optionally, the third measurement component includes: a rotation speed sensor configured to measure the rotation speed of the output shaft of the steering motor; The measuring module is respectively connected to the rotation speed sensor and the torque sensor in the steering motor, and the torque sensor is configured to measure the torque of the output shaft of the steering motor; The measuring module is configured to determine the input power of the rear-wheel steering system based on the rotation speed and the torque.

[0009] Optionally, the device further comprises: a control module connected to the steering motor, and an ignition switch connected to the control module; The ignition switch is connected to the circuit loop between the steering motor and the power supply, and the ignition switch is used to connect or disconnect the circuit loop; The control module is configured to control the ignition switch to connect the circuit loop in response to a measurement start signal; and, when the circuit loop is connected, send a steering signal to the steering motor to control the steering motor to drive the rack to move.

[0010] Optionally, the rear-wheel steering system further comprises: a housing, wherein the housing is provided with an accommodating cavity; The rack is located in the accommodating cavity, and the housing allows the rack and the housing to produce relative displacement; The device further comprises: a supporting assembly connected to the shell.

[0011] Optionally, the support assembly includes a base and a first mounting seat, a second mounting seat, and a third mounting seat respectively slidably connected to the base; The first mounting seat is connected to a portion of the housing close to the first end, the second mounting seat is connected to a portion of the housing far from the first end, and the third mounting seat is connected to the second measuring assembly; Wherein, the height difference between the first mounting seat and the second mounting seat is a preset height so that the length direction of the rack is parallel to the horizontal direction.

[0012] A second aspect of the embodiments of the present application provides a method for measuring steering efficiency, the method being applied to the device for measuring steering efficiency described in the first aspect of the embodiments of the present application, the method comprising: Determine the output power of the rear-wheel steering system based on the moving speed and the load force, and determine the input power of the rear-wheel steering system based on the rotation speed of the steering motor; Based on the input power and the output power, an efficiency of the rear wheel steering system is determined.

[0013] Optionally, the rear-wheel steering system further includes a synchronous pulley transmission assembly, wherein the synchronous pulley transmission assembly is respectively connected to the rack and the steering motor, and the input power of the rear-wheel steering system is determined based on the output power of the steering motor, including: Obtaining the transmission efficiency of the synchronous belt pulley transmission assembly; The input power of the rear wheel steering system is determined based on the output power of the steering motor and the transmission efficiency.

[0014] According to a third aspect of an embodiment of the present application, a system for measuring steering efficiency is provided, comprising the device for measuring steering efficiency described in the first aspect of an embodiment of the present application, or comprising a control module, wherein the control module is used to implement the steps of the method for measuring steering efficiency described in the second aspect of the embodiment of the present application.

[0015] The present application provides an apparatus, method and system for measuring steering efficiency, the apparatus comprising: a first measuring component connected to a first end of the rack and configured to measure a moving rate of the rack; a second measuring component connected to a second end of the rack different from the first end and configured to measure a load force borne by the rack; a third measuring component connected to the steering motor and configured to measure a rotational speed of the steering motor; a measuring module connected to the first measuring component, the second measuring component and the third measuring component respectively, configured to determine an output power of the rear-wheel steering system based on the moving rate and the load force, and to determine an input power of the rear-wheel steering system based on the rotational speed of the steering motor; and to determine the efficiency of the rear-wheel steering system based on the input power and the output power.

[0016] The device described in the present application includes a first measuring component, a second measuring component, and a third measuring component. The first measuring component, the second measuring component, and the third measuring component are respectively used to measure the moving speed of the rack of the rear-wheel steering system, the load force borne by the rack, and the speed of the steering motor of the rear-wheel steering system. The device also includes a measuring module connected to the first measuring component, the second measuring component, and the third measuring component respectively. The measuring module determines the output power and input power of the rear-wheel steering system based on the moving speed and load capacity of the rack and the speed of the steering motor, and then determines the efficiency of the rear-wheel steering system. The device described in the present application uses the third measuring component to obtain the speed of the steering motor, and then can determine the input power of the rear-wheel steering system based on the speed of the steering motor, without having to determine the input power through the input torque of the steering wheel, thereby realizing the measurement of the steering efficiency of the rear-wheel steering system.

[0017] In addition, while related technologies all determine the input power of the steering system by the input torque of the steering wheel, this application determines the input power by the rotational speed of the steering motor, breaking the inherent technical ideas of related technologies and achieving a major technical breakthrough in improving the method of measuring steering efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 is a schematic diagram of the structure of a device for measuring steering efficiency provided in an embodiment of the present application; Figure 2is a step diagram of a method for measuring steering efficiency provided in an embodiment of the present application; Figure 3 This is a step diagram of a method for determining input power provided in an embodiment of the present application.

[0020] Description of labels: 1-steering motor, 2-rack, 3-first measuring assembly, 31-reflector, 32-laser generator, 33-laser receiver, 4-second measuring assembly, 41-load force sensor, 42-hydraulic cylinder, 5-third measuring assembly, 51-speed sensor, 6-measuring module, 7-control module, 8-ignition switch, 9-power supply, 10-housing, 11-support assembly, 111-base, 112-first mounting seat, 113-second mounting seat, 114-third mounting seat. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] The steering system is a system used to control the steering of the wheels. It can be divided into front-wheel steering system and rear-wheel steering system according to the position of the controlled wheels. The front-wheel steering system achieves steering through the driving of the steering wheel input torque. The relevant technology can measure the steering efficiency of the front-wheel steering system through the steering wheel input torque and the rack output force.

[0023] However, in the rear-wheel steering system, steering is achieved entirely by controlling the steering motor through the vehicle message without input torque from the steering wheel. Therefore, related technologies cannot measure the steering efficiency of the rear-wheel steering system.

[0024] Based on this, in order to solve the problem of how to measure the steering efficiency of the rear-wheel steering system, the present application provides a device, method and system for measuring the steering efficiency, including a first measuring component, a second measuring component, and a third measuring component. The first measuring component, the second measuring component, and the third measuring component are respectively used to measure the moving rate of the rack of the rear-wheel steering system, the load force borne by the rack, and the speed of the steering motor of the rear-wheel steering system. The device also includes a measuring module connected to the first measuring component, the second measuring component and the third measuring component respectively. The measuring module determines the output power and input power of the rear-wheel steering system based on the moving rate and load capacity of the rack and the speed of the steering motor, and then determines the efficiency of the rear-wheel steering system. The device described in the present application uses the third measuring component to obtain the speed of the steering motor, and then can determine the input power of the rear-wheel steering system based on the speed of the steering motor, without having to determine the input power through the input torque of the steering wheel, thereby realizing the measurement of the steering efficiency of the rear-wheel steering system.

[0025] In addition, while related technologies all determine the input power of the steering system by the input torque of the steering wheel, this application determines the input power by the rotational speed of the steering motor, breaking the inherent technical ideas of related technologies and achieving a major technical breakthrough in improving the method of measuring steering efficiency.

[0026] The device described in this application is as follows: In a first aspect, the present application proposes an embodiment, wherein the device is applied to a rear-wheel steering system, the rear-wheel steering system comprises a steering motor 1 and a rack 2 connected to the steering motor 1, and the steering motor 1 is used to drive the rack 2 to move.

[0027] The rear wheel steering system is a system for driving the rear wheels of a vehicle to steer, comprising a steering motor 1 and a rack 2 connected to the steering motor 1, with both ends of the rack 2 connected to the left and right rear wheels respectively through steering tie rods. The length direction of the rack 2 extends along the length direction of the rear steering axle, and the rack 2 can move along its own length direction under the drive of the steering motor 1. When the rack 2 moves along its own length direction, the left and right rear wheels will deflect at an angle driven by the rack 2, thereby realizing rear wheel steering.

[0028] The steering angles of the left and right rear wheels are determined by the vehicle controller according to the steering angle of the front wheels and the overall driving conditions of the vehicle. After determining the steering angle of the rear wheels, the vehicle controller sends a control signal corresponding to the steering angle to the steering motor 1, thereby controlling the rack 2 to move a displacement corresponding to the steering angle.

[0029] The steering motor 1 may also be referred to as a power steering motor or a power steering motor.

[0030] like Figure 1As shown in the schematic diagram of the structure of a device for measuring steering efficiency, the device includes: a first measuring assembly 3 connected to a first end of the rack 2 and configured to measure a moving speed of the rack 2; A second measuring component 4 is connected to a second end of the rack 2 different from the first end, and is configured to measure the load force borne by the rack 2; a third measuring component 5 connected to the steering motor 1 and configured to measure the rotation speed of the steering motor 1; The measuring module 6 is connected to the first measuring component 3, the second measuring component 4 and the third measuring component 5 respectively, and is configured to determine the output power of the rear-wheel steering system based on the moving speed and the load force, determine the input power of the rear-wheel steering system based on the rotational speed of the steering motor 1; and determine the efficiency of the rear-wheel steering system based on the input power and the output power.

[0031] The first measuring component 3 may be a Hall-type speed sensor or a photoelectric effect speed sensor. Taking the photoelectric effect speed sensor as an example, the structure of the first measuring component 3 is illustrated. The first measuring component 3 may include a light-emitting diode, a phototransistor, and a signal disk with a gap, and the movement of the signal disk is synchronized with the rack 2. When the signal disk located between the light-emitting diode and the phototransistor moves with the rack 2, the light emitted by the light-emitting diode will intermittently illuminate the phototransistor, and the phototransistor will generate a voltage under the induction of light, so that the movement rate of the rack 2 is determined by the change of voltage.

[0032] The second measuring component 4 may be a resistive strain sensor or a piezoelectric sensor. Taking the resistive strain sensor as an example, the structure of the second measuring component 4 is illustrated. The second measuring component 4 may include a strain resistor and a bridge circuit, and the strain resistor is attached to the surface of the rack 2. When the rack 2 is deformed by force, the deformation of the rack 2 will be further transmitted to the strain resistor, thereby causing a change in the resistance value of the strain resistor. Thus, by measuring the change in the resistance value, the load force borne by the rack 2 can be determined.

[0033] The third measuring component 5 may be a magnetoelectric speed sensor, including a permanent magnet, an iron core with a coil winding, and a signal disk. When the tooth valleys and tooth tops of the signal disk, driven by the output shaft of the steering motor 1, alternately pass through the sensor with the permanent magnet and the coil, the coil will generate a sinusoidal induced voltage, and then the speed of the steering motor 1 is determined by the change in voltage.

[0034] The measuring module 6 may be a host computer, such as a desktop computer, a notebook computer or a server. When the measuring module 6 is a host computer, the CANApe software may be installed on the measuring module 6, and the moving speed of the rack 2 is obtained from the first measuring component 3, the load force of the rack 2 is obtained from the second measuring component 4, and the rotation speed of the steering motor 1 is obtained from the third measuring component 5 through the CANApe software.

[0035] After obtaining the moving speed of the rack 2, the load force and the rotation speed of the steering motor 1, the measuring module 6 calculates the output power of the rear-wheel steering system through the rack 2 based on the moving speed and the load force of the rack 2 by using the power calculation formula corresponding to the speed and force. In addition, based on the rotation speed of the steering motor 1, the input power input from the steering motor 1 to the rear-wheel steering system is calculated by using the power calculation formula corresponding to the rotation speed. Finally, the efficiency of the rear-wheel steering system is calculated by using the efficiency calculation formula of the rear-wheel steering system shown in formula (1).

[0036] Formula (1): η = η2 / η1 × 100% Among them, η is the efficiency of the rear-wheel steering system, η1 is the input power of the rear-wheel steering system, and η2 is the output power of the rear-wheel steering system.

[0037] In an optional embodiment, the first end of the rack 2 may be an end connected to the right rear wheel of the vehicle, and the second end of the rack 2 may be an end connected to the left rear wheel of the vehicle.

[0038] The device of this embodiment includes a first measuring component 3, a second measuring component 4, and a third measuring component 5. The first measuring component 3, the second measuring component 4, and the third measuring component 5 are respectively used to measure the moving speed of the rack 2 of the rear-wheel steering system, the load force borne by the rack 2, and the speed of the steering motor 1 of the rear-wheel steering system. The device also includes a measuring module 6 connected to the first measuring component 3, the second measuring component 4, and the third measuring component 5 respectively. The measuring module 6 determines the output power and input power of the rear-wheel steering system based on the moving speed and load capacity of the rack 2 and the speed of the steering motor 1, and then determines the efficiency of the rear-wheel steering system. The device of this embodiment uses the third measuring component 5 to obtain the speed of the steering motor 1, and then can determine the input power of the rear-wheel steering system based on the speed of the steering motor 1, without having to determine the input power through the input torque of the steering wheel, thereby realizing the measurement of the steering efficiency of the rear-wheel steering system.

[0039] In addition, while related technologies all determine the input power of the steering system by the input torque of the steering wheel, this embodiment determines the input power by the rotational speed of the steering motor 1, which also breaks the inherent technical ideas of related technologies and achieves a major technical breakthrough in improving the method of measuring steering efficiency.

[0040] Optionally, the second measuring component 4 includes: a load force sensor 41 and a hydraulic cylinder 42, and the load force sensor 41 and the hydraulic cylinder 42 are respectively connected to the measuring module 6; The hydraulic cylinder 42 is connected to the second end of the rack 2, and the load force sensor 41 is arranged on the side of the rack 2 and connected to the measuring module 6; A load force sensor 41 is configured to measure the load force borne by the rack 2; The hydraulic cylinder 42 is configured to apply a force to the rack 2 in a direction opposite to the moving direction of the rack 2 when the rack 2 moves, so as to simulate the force of the wheel on the rack 2.

[0041] The load force sensor 41 is used to measure the load force borne by the rack 2. Since the rack 2 is mainly subjected to the force in the length direction during the movement, and the force in the length direction causes the rack 2 to deform in the length direction, the load force sensor 41 can be set on the side of the rack 2 to improve the accuracy of the load force measurement.

[0042] The hydraulic cylinder 42 includes a cylinder body and a cylinder rod, and the cylinder rod is connected to the rack 2. In an optional embodiment, the cylinder rod can be directly connected to the rack 2, or connected to the rack 2 through a steering rod connected to the rack 2.

[0043] In order to achieve the deflection of the rear wheel angle, the rear wheel steering system needs to first overcome the friction between the rear wheel and the ground during the vehicle's driving. In the process of overcoming the friction between the rear wheel and the ground by the rear wheel steering system, the rack 2 will encounter resistance during the movement.

[0044] Therefore, in the process of movement of the rack 2, the hydraulic cylinder 42 applies a force to the rack 2 in the opposite direction of the movement of the rack 2, thereby simulating the force of the wheel on the vehicle on the rack 2 of the rear-wheel steering system. This can improve the similarity between the working condition of the rear-wheel steering system on the device for measuring the steering efficiency and the working condition of the rear-wheel steering system on the vehicle, thereby improving the accuracy of the efficiency measurement.

[0045] In an optional embodiment, the force exerted by the rear wheels on the rack 2 at different angles can be measured on the vehicle first, and the different angles of the rear wheels can be corresponded to the displacements of the rack 2 to determine the different forces exerted by the wheels on the rack 2 at different positions. Therefore, according to the different forces exerted by the wheels on the rack 2 at different positions, the force exerted by the hydraulic cylinder 42 on the rack 2 can be controlled to simulate the force exerted by the wheels on the rack 2.

[0046] Optionally, the first measuring component 3 includes: a reflector 31, a laser generator 32 and a laser receiver 33; The reflector 31 is fixed at the first end and is configured to move synchronously with the rack 2; The laser generator 32 and the laser receiver 33 are both separated from the rack 2 and are configured to remain stationary during the movement of the rack 2; A laser generator 32 is configured to emit laser light toward the reflector 31; A reflector 31 configured to reflect laser light toward a laser receiver 33; The laser receiver 33 is configured to receive the laser reflected by the reflector 31; The moving speed is determined based on the time when the laser generator 32 emits the laser and the time when the laser receiver 33 receives the laser.

[0047] The reflector 31 is a device for reflecting laser light, and its surface is smooth, and can reflect the laser light in a mirror-like manner. In an optional embodiment, the reflector 31 can be made of silicon, quartz or sapphire, and the reflector 31 of different materials can be selected according to different laser wavelengths.

[0048] The laser generator 32 is a device for emitting laser light, and can generate laser light by stimulating an excitation medium. The laser receiver 33 is a device for receiving laser light, and is provided with a laser sensing element. In an optional embodiment, the laser sensing element can be a photodiode, a photomultiplier tube, an avalanche photodiode, or a charge coupled device, etc.

[0049] In an optional embodiment, the first measuring component 3 may also include a rate calculation module, which is connected to the laser generator 32 and the laser receiver 33 respectively, records the moment when the laser generator 32 emits the laser and the moment when the laser receiver 33 receives the laser, and then calculates the moving rate of the rack 2.

[0050] This embodiment calculates the moving speed of the rack 2 by the time when the laser generator 32 emits the laser and the time when the laser receiver 33 receives the laser. The high-precision characteristics of the laser generator 32 and the laser receiver 33 can be used to improve the accuracy of the measurement of the moving speed of the rack 2, thereby ensuring the accuracy of the efficiency of the rear-wheel steering system.

[0051] Optionally, the third measuring component 5 includes: a rotation speed sensor 51 configured to measure the rotation speed of the output shaft of the steering motor 1; The measuring module 6 is respectively connected to the rotation speed sensor 51 and the torque sensor in the steering motor 1 , and the torque sensor is configured to measure the torque of the output shaft of the steering motor 1 ; The measuring module 6 is configured to determine the input power of the rear wheel steering system based on the rotation speed and the torque.

[0052] The steering motor 1 is provided with a torque sensor, which can collect the torque output by the steering motor 1 . The third measuring component 5 includes a rotation speed sensor 51 , which can measure the rotation speed output by the steering motor 1 .

[0053] The torque sensor can be a magnetoelectric torque sensor, a fiber optic torque sensor, or a magnetoelastic torque sensor. Taking the fiber optic torque sensor as an example, the measurement principle of the torque sensor is introduced. The torque sensor can use the fiber Bragg grating technology to read the light signals reflected from two corresponding positions on the output shaft of the steering motor 1 and calculate the phase difference to measure the torque.

[0054] In this embodiment, the torque sensor built into the steering motor 1 is connected to the measuring module 6, so that the input torque of the rear-wheel steering system is calculated by the torque measured by the torque sensor. This can make the device unnecessary to set up an external torque sensor, thereby reducing the production cost of the device.

[0055] Optionally, the device further comprises: a control module 7 connected to the steering motor 1, and an ignition switch 8 connected to the control module 7; The ignition switch 8 is connected to the circuit loop between the steering motor 1 and the power source 9, and the ignition switch 8 is used to connect or disconnect the circuit loop; The control module 7 is configured to control the ignition switch 8 to connect the circuit loop in response to the measurement start signal; and, when the circuit loop is connected, send a steering signal to the steering motor 1 to control the steering motor 1 to drive the rack 2 to move.

[0056] The device also includes a control module 7 and an ignition switch 8. The control module 7 can be a desktop computer, a laptop computer or a server. The ignition switch 8 is connected to the circuit loop between the steering motor 1 and the power supply 9, and is used to connect or disconnect the circuit loop. When the circuit loop is connected, the power supply 9 outputs electric energy to the steering motor 1, so that the steering motor 1 can drive the rack 2 to move; when the circuit loop is disconnected, the power supply 9 cannot output electric energy to the steering motor 1, and the steering motor 1 cannot drive the rack 2 to move.

[0057] The measurement start signal is a signal for instructing the device to start measuring the efficiency of the rear wheel steering system, which can be triggered by a tester. In response to the measurement start signal, the control module 7 controls the ignition switch 8 to connect the circuit loop, and after connecting the circuit loop, further sends a steering signal to the steering motor 1, thereby controlling the steering motor 1 to start driving the rack 2 to move.

[0058] In this embodiment, an ignition switch 8 and a control module 7 are added to the device, so that the turning on and off of the steering motor 1 can be controlled by the control module 7, thereby improving the controllability and operability of the device.

[0059] Optionally, the rear-wheel steering system further includes: a housing 10, wherein the housing 10 is provided with an accommodating cavity; The rack 2 is located in the accommodating cavity, and the housing 10 allows the rack 2 and the housing 10 to have relative displacement; The device further includes: a supporting assembly 11 , which is connected to the housing 10 .

[0060] The device also includes a support assembly 11 for supporting and fixing the rear wheel steering system. The support assembly 11 is connected to the housing 10 of the rear wheel steering system. The rack 2 is wrapped inside the housing 10 and can move relative to the housing 10. When the steering motor 1 drives the rack 2 to move, the housing 10 and the support assembly 11 remain relatively stationary, and the rack 2 moves relative to the housing 10.

[0061] The device in this embodiment includes a support assembly 11. During the steering efficiency measurement, the support assembly 11 is connected to the housing 10 of the rear-wheel steering system, so that the rear-wheel steering system is fixed without hindering the movement of the rack 2, thereby reducing the influence of the external environment on the efficiency measurement of the rear-wheel steering system and improving the accuracy of the efficiency measurement.

[0062] Optionally, the support assembly 11 includes a base 111 and a first mounting seat 112, a second mounting seat 113, and a third mounting seat 114 respectively slidably connected to the base 111; The first mounting seat 112 is connected to the portion of the housing 10 close to the first end, the second mounting seat 113 is connected to the portion of the housing 10 away from the first end, and the third mounting seat 114 is connected to the second measuring assembly 4; The height difference between the first mounting seat 112 and the second mounting seat 113 is a preset height, so that the length direction of the rack 2 is parallel to the horizontal direction.

[0063] The support assembly 11 includes a base 111 and a first mounting seat 112, a second mounting seat 113 and a third mounting seat 114 which are all slidably connected to the base 111. The first mounting seat 112 and the second mounting seat 113 are respectively connected to different positions of the housing 10, the first mounting seat 112 is connected to a portion of the housing 10 close to the first end, and the second mounting seat 113 is connected to a portion of the housing 10 away from the first end, and the height difference between the first mounting seat 112 and the second mounting seat 113 is a preset height difference, so that the length direction of the rack 2 is parallel to the horizontal direction, so as to reduce the influence of the gravity of the rack 2 itself on the moving speed of the rack 2, and improve the measurement accuracy of the efficiency of the rear wheel steering system.

[0064] In an optional embodiment, a guide rail can be installed on the base 111, and a guide slider can be installed on the side where the first mounting seat 112, the second mounting seat 113 and the third mounting seat 114 are connected to the base 111. The guide slider is embedded in the guide rail, thereby realizing a sliding connection between the first mounting seat 112, the second mounting seat 113 and the third mounting seat 114 and the base 111.

[0065] When the rear-wheel steering system is installed on a device for measuring steering efficiency, the first mounting seat 112, the second mounting seat 113 and the third mounting seat 114 can be adjusted according to the size differences between different rear-wheel steering systems, thereby improving the adaptability between the device of the present application and different rear-wheel steering systems.

[0066] Based on the same inventive concept, the present application also provides a method for measuring steering efficiency, such as Figure 2 A method for measuring steering efficiency is shown in the step diagram, the method comprising: Step S101, determining the output power of the rear-wheel steering system based on the moving speed and the load force, and determining the input power of the rear-wheel steering system based on the rotation speed of the steering motor; Step S102: determining the efficiency of the rear-wheel steering system based on the input power and the output power.

[0067] Optionally, the rear wheel steering system further comprises a synchronous belt pulley transmission assembly, which is respectively connected to the rack and the steering motor, Figure 3 A method for determining input power is shown in the step diagram, wherein the input power of the rear wheel steering system is determined based on the rotation speed of the steering motor in step S101, specifically including the following steps: Step S1011, obtaining the transmission efficiency of the synchronous belt pulley transmission assembly.

[0068] Step S1012: determining the input power of the rear-wheel steering system based on the rotational speed of the steering motor and the transmission efficiency.

[0069] The rear-wheel steering system also includes a synchronous pulley transmission assembly. The synchronous pulley transmission assembly may include a first pulley, a second pulley, and a synchronous belt. The first pulley is connected to the output shaft of the steering motor, the second pulley is connected to the rack, and the synchronous belt is respectively wrapped around the wheel surfaces of the first pulley and the second pulley. When the steering motor drives the rack to move, the output shaft of the steering motor first drives the first pulley to rotate, and then drives the second pulley to rotate through the synchronous belt, and transmits the movement of the steering motor output shaft to the rack through the second pulley. Therefore, in order to ensure the accuracy of the efficiency measurement of the rear-wheel steering system, the transmission efficiency of the synchronous pulley transmission assembly also needs to be considered.

[0070] In an optional implementation, when the rear-wheel steering system includes a rear-wheel reduction device, the reduction ratio of the rear-wheel reduction device also needs to be considered. Specifically, the input power of the rear-wheel steering system can be calculated by the following formula (2).

[0071] Formula (2): η1=2π×T×n×η3×i Among them, η1 is the input power of the rear wheel steering system, T is the torque of the steering motor 1, n is the speed of the steering motor 1, η3 is the transmission efficiency of the synchronous belt pulley, and i is the reduction ratio of the rear wheel reduction device.

[0072] In an optional implementation, the transmission efficiency of the synchronous belt pulley transmission assembly may be pre-stored in a storage module of the device, and obtained from the storage module when calculating the input power.

[0073] This embodiment also takes into account the influence of the transmission efficiency of the synchronous pulley transmission assembly on the input power of the rear wheel steering system when calculating the input power, thereby improving the accuracy of the input efficiency and ultimately achieving accurate measurement of the efficiency of the rear wheel steering system.

[0074] Based on the above embodiments, reference Figure 1 A flow chart of a device for measuring steering efficiency is shown, and the device for measuring steering efficiency of the present application will be exemplarily described below: The device for measuring steering efficiency of the present application is applied to a rear-wheel steering system. The rear-wheel steering system includes a steering motor 1, a synchronous belt pulley transmission assembly, a rack 2 and a housing 10, wherein the synchronous belt pulley transmission assembly is connected to the rack 2 and the steering motor 1 respectively. A torque sensor is provided in the steering motor 1, and an accommodating cavity is provided in the housing 10. The rack 2 is located in the accommodating cavity, and the rack 2 can generate relative displacement with the housing 10.

[0075] The device for measuring steering efficiency of the present application comprises a first measuring component 3, a second measuring component 4, a third measuring component 5, a supporting component 11, a measuring module 6, a storage module connected to the measuring module 6, an ignition switch 8, and a control module 7 connected to the ignition switch 8. The ignition switch 8 is connected to the circuit loop between the steering motor 1 and the power supply 9, and is used to connect or disconnect the circuit loop. The storage module stores the transmission efficiency of the synchronous belt pulley transmission assembly.

[0076] The first measuring component 3 includes a reflector 31, a laser generator 32 and a laser receiver 33. The reflector 31 is fixed at the first end and is configured to move synchronously with the rack 2. The laser generator 32 and the laser receiver 33 are separated from the rack 2 and are configured to remain stationary during the movement of the rack 2. The laser generator 32 is configured to emit laser light to the reflector 31, the reflector 31 is configured to reflect laser light to the laser receiver 33, and the laser receiver 33 is configured to receive the laser light after being reflected by the reflector 31. The moving rate is determined based on the moment when the laser generator 32 emits the laser light and the moment when the laser receiver 33 receives the laser light. In an optional embodiment, the laser generator 32 and the laser receiver 33 can be connected to the housing 10 of the rear-wheel steering system.

[0077] The second measuring assembly 4 includes a load force sensor 41 and a hydraulic cylinder 42. The load force sensor 41 and the hydraulic cylinder 42 are respectively connected to the measuring module 6. The hydraulic cylinder 42 is connected to the second end of the rack 2, and the load force sensor 41 is arranged on the side of the rack 2 and connected to the measuring module 6. The load force sensor 41 is configured to measure the load force borne by the rack 2, and the hydraulic cylinder 42 is configured to apply a force opposite to the moving direction of the rack 2 to the rack 2 when the rack 2 moves, so as to simulate the force of the wheel on the rack 2.

[0078] The third measuring component 5 includes a rotation speed sensor 51. The rotation speed sensor 51 is configured to measure the rotation speed of the output shaft of the steering motor 1. The measuring module 6 is respectively connected to the rotation speed sensor 51 and a torque sensor in the steering motor 1, and the torque sensor is configured to measure the torque of the output shaft of the steering motor 1.

[0079] The support assembly 11 includes a base 111 and a first mounting seat 112, a second mounting seat 113, and a third mounting seat 114 respectively connected to the base 111 in a sliding manner. The first mounting seat 112 is connected to a portion of the housing 10 close to the first end, and the second mounting seat 113 is connected to a portion of the housing 10 away from the first end. The third mounting seat 114 is connected to the second measuring assembly 4, and can be specifically connected to the hydraulic cylinder 42 of the second measuring assembly 4. The height difference between the first mounting seat 112 and the second mounting seat 113 is a preset height so that the length direction of the rack 2 is parallel to the horizontal direction.

[0080] Next, taking the test process of the efficiency of a rear-wheel steering system as an example, the use process of the device for measuring steering efficiency of the present application is briefly described: First, the positions of the first mounting seat 112 and the second mounting seat 113 are adjusted so that the distance between the first mounting seat 112 and the second mounting seat 113 is adapted to the position of the housing 10 of the rear-wheel steering system, and the first mounting seat 112 and the second mounting seat 113 are connected to the housing 10. Furthermore, the position of the third mounting seat 114 is adjusted so that the position of the hydraulic cylinder 42 is adapted to the position of the second end of the rack 2, and the hydraulic cylinder 42 is connected to the second end.

[0081] Afterwards, referring to the connection method of the embodiment of the present application, the components in the first measuring assembly 3, the second measuring assembly 4 and the third measuring assembly 5 are respectively connected to the components of the rear wheel steering system. After the connection is completed, the control module 7 first responds to the measurement start signal, controls the ignition switch 8 to connect the circuit loop between the steering motor 1 and the power supply 9, and sends a steering signal to the steering motor 1 when the circuit loop is connected, so as to control the steering motor 1 to drive the rack 2 to move.

[0082] Then, when the rack 2 moves, the hydraulic cylinder 42 applies a force to the rack 2 in the opposite direction of the rack 2 to simulate the force of the wheel on the rack 2. At the same time, the measuring module 6 determines the moving speed of the rack 2 through the time when the laser generator 32 emits the laser and the time when the laser receiver 33 receives the laser; and obtains the speed of the steering motor 1 through the speed sensor 51 and the torque of the steering motor 1 through the torque sensor; and obtains the load force borne by the rack 2 through the load force sensor 41.

[0083] Finally, the measuring module 6 determines the input power of the rear-wheel steering system based on the rotational speed, torque and the transmission efficiency of the synchronous pulley obtained from the storage module, and determines the output power of the rear-wheel steering system based on the movement rate of the rack 2 and the load force it bears, and finally determines the efficiency of the rear-wheel steering system based on the input power and the output power.

[0084] The embodiment of the present application also provides a computer-readable storage medium on which a computer program / instruction is stored. When the computer program / instruction is executed by a processor, an apparatus for measuring steering efficiency as disclosed in the embodiment of the present application is implemented.

[0085] An embodiment of the present application also provides a system for measuring steering efficiency, including the device for measuring steering efficiency according to the first aspect of the embodiment of the present application, or including a control module 7, which is used to implement the steps of the method for measuring steering efficiency according to the second aspect of the embodiment of the present application.

[0086] The present application provides an apparatus, method and system for measuring steering efficiency, the apparatus comprising: a first measuring component 3, connected to a first end of a rack 2, configured to measure a moving rate of the rack 2; a second measuring component 4, connected to a second end of the rack 2 different from the first end, configured to measure a load force borne by the rack 2; wherein the second end of the rack 2 is configured to be connected to a rear wheel of a vehicle; a third measuring component 5, connected to a steering motor 1, configured to measure a rotational speed of the steering motor 1; a measuring module 6, respectively connected to the first measuring component 3, the second measuring component 4 and the third measuring component 5, configured to determine an output power of a rear-wheel steering system based on a moving rate and a load force, and to determine an input power of the rear-wheel steering system based on a rotational speed of the steering motor 1; and to determine the efficiency of the rear-wheel steering system based on the input power and the output power.

[0087] The device of the present application includes a first measuring component 3, a second measuring component 4, and a third measuring component 5. The first measuring component 3, the second measuring component 4, and the third measuring component 5 are respectively used to measure the moving speed of the rack 2 of the rear-wheel steering system, the load force borne by the rack 2, and the speed of the steering motor 1 of the rear-wheel steering system. The device also includes a measuring module 6 connected to the first measuring component 3, the second measuring component 4, and the third measuring component 5. The measuring module 6 determines the output power and input power of the rear-wheel steering system based on the moving speed and load capacity of the rack 2 and the speed of the steering motor 1, and then determines the efficiency of the rear-wheel steering system. The device of the present application uses the third measuring component 5 to obtain the speed of the steering motor 1, and then can determine the input power of the rear-wheel steering system based on the speed of the steering motor 1, without having to determine the input power through the input torque of the steering wheel, thereby realizing the measurement of the steering efficiency of the rear-wheel steering system.

[0088] In addition, while related technologies all determine the input power of the steering system by the input torque of the steering wheel, this application determines the input power by the rotational speed of the steering motor 1, breaking the inherent technical ideas of related technologies and achieving a major technical breakthrough in improving the method of measuring steering efficiency.

[0089] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0090] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, systems, electronic devices, and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0091] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0092] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0093] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0094] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0095] The above is a detailed introduction to a device, method and system for measuring steering efficiency provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A device for measuring steering efficiency, characterized in that: The device is applied to a rear-wheel steering system, which comprises a steering motor and a rack connected to the steering motor, wherein the steering motor is used to drive the rack to move; the device comprises: a first measuring assembly connected to the first end of the rack and configured to measure a movement rate of the rack; a second measuring assembly connected to a second end of the rack different from the first end and configured to measure a load force borne by the rack; a third measuring component, connected to the steering motor and configured to measure a rotation speed of the steering motor; The measurement module is connected to the first measurement component, the second measurement component and the third measurement component respectively, and is configured to determine the output power of the rear-wheel steering system based on the moving speed and the load force, determine the input power of the rear-wheel steering system based on the rotational speed of the steering motor; and determine the efficiency of the rear-wheel steering system based on the input power and the output power.

2. The device for measuring steering efficiency according to claim 1, characterized in that: The second measuring component comprises: a load force sensor and a hydraulic cylinder, wherein the load force sensor and the hydraulic cylinder are respectively connected to the measuring module; The hydraulic cylinder is connected to the second end of the rack, and the load force sensor is arranged on the side of the rack; The load force sensor is configured to measure the load force borne by the rack; The hydraulic cylinder is configured to apply a force to the rack in a direction opposite to the moving direction of the rack when the rack moves, so as to simulate the force of the wheel on the rack.

3. The device for measuring steering efficiency according to claim 1, characterized in that: The first measuring component includes: a reflector, a laser generator and a laser receiver; The reflector is fixed to the first end and is configured to move synchronously with the rack; The laser generator and the laser receiver are both separated from the rack and are configured to remain stationary during the movement of the rack; The laser generator is configured to emit laser light toward the reflector; The reflector is configured to reflect the laser light toward the laser receiver; The laser receiver is configured to receive the laser reflected by the reflector; The moving speed is determined based on the time when the laser generator emits the laser and the time when the laser receiver receives the laser.

4. The device for measuring steering efficiency according to claim 1, characterized in that: The third measurement component includes: a rotation speed sensor configured to measure the rotation speed of the output shaft of the steering motor; The measuring module is respectively connected to the rotation speed sensor and the torque sensor in the steering motor, and the torque sensor is configured to measure the torque of the output shaft of the steering motor; The measuring module is configured to determine the input power of the rear-wheel steering system based on the rotation speed and the torque.

5. The device for measuring steering efficiency according to claim 1, characterized in that: The device further comprises: a control module connected to the steering motor, and an ignition switch connected to the control module; The ignition switch is connected to the circuit loop between the steering motor and the power supply, and the ignition switch is used to connect or disconnect the circuit loop; The control module is configured to control the ignition switch to connect the circuit loop in response to a measurement start signal; and, when the circuit loop is connected, send a steering signal to the steering motor to control the steering motor to drive the rack to move.

6. The device for measuring steering efficiency according to claim 1, characterized in that: The rear-wheel steering system further comprises: a housing, wherein the housing is provided with an accommodating cavity; The rack is located in the accommodating cavity, and the housing allows the rack and the housing to produce relative displacement; The device further comprises: a supporting assembly connected to the shell.

7. The device for measuring steering efficiency according to claim 6, characterized in that: The support assembly includes a base and a first mounting seat, a second mounting seat, and a third mounting seat respectively connected to the base in a sliding manner; The first mounting seat is connected to a portion of the housing close to the first end, the second mounting seat is connected to a portion of the housing far from the first end, and the third mounting seat is connected to the second measuring assembly; Wherein, the height difference between the first mounting seat and the second mounting seat is a preset height so that the length direction of the rack is parallel to the horizontal direction.

8. A method for measuring steering efficiency, characterized in that: The method is applied to the device for measuring steering efficiency as claimed in any one of claims 1 to 7, and the method comprises: Determine the output power of the rear-wheel steering system based on the moving speed and the load force, and determine the input power of the rear-wheel steering system based on the rotation speed of the steering motor; Based on the input power and the output power, an efficiency of the rear wheel steering system is determined.

9. The method for measuring steering efficiency according to claim 8, characterized in that: The rear-wheel steering system further includes a synchronous belt pulley transmission assembly, wherein the synchronous belt pulley transmission assembly is respectively connected to the rack and the steering motor, and the input power of the rear-wheel steering system is determined based on the rotation speed of the steering motor, including: Obtaining the transmission efficiency of the synchronous belt pulley transmission assembly; The input power of the rear wheel steering system is determined based on the rotation speed of the steering motor and the transmission efficiency.

10. A system for measuring steering efficiency, characterized in that: The invention comprises a device for measuring steering efficiency as claimed in any one of claims 1 to 7, or comprises a control module, wherein the control module is used to implement the steps of the method for measuring steering efficiency as claimed in any one of claims 8 to 9.

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