CN113759185A

CN113759185A - Test device for multi-format signal output

Info

Publication number: CN113759185A
Application number: CN202010497409.4A
Authority: CN
Inventors: 部荣; 刘文文; 董晓; 李明; 李琼; 王宁宁; 祝忠扬; 陈海文; 段成林
Original assignee: Honeycomb Intelligent Steering System Jiangsu Co Ltd Baoding Branch
Current assignee: Beehive Intelligent Steering System Jiangsu Co ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-12-07
Anticipated expiration: 2040-06-02
Also published as: CN113759185B

Abstract

The invention relates to the technical field of control, and provides a testing device for multi-format signal output. The device includes: the device comprises a CAN signal receiving unit, a calculating unit, a proportional amplifying unit, an armature and at least one Hall chip, wherein the CAN signal receiving unit is used for receiving CAN signals; the calculation unit is used for calculating and outputting a PWM signal according to the CAN signal; the proportional amplification unit is used for outputting current to a winding coil of the armature according to the PWM signal so as to generate a magnetic field; the at least one Hall chip is located in the magnetic field and used for outputting signals in a corresponding format. The invention can output signals with any format and has lower cost.

Description

Test device for multi-format signal output

Technical Field

The invention relates to the technical field of control, in particular to a test device for multi-format signal output.

Background

Along with the gradual improvement of the intellectualization of vehicles, electronic components of the whole vehicle are more and more complex, the requirement on the anti-electromagnetic interference capability of each part is higher and higher, so that the signal format transmitted by the sensor is changed, the sensor has multiple transmission formats, and when a system and equipment using the sensor, such as an Electric Power Steering (EPS), are tested, it is difficult to find generating equipment capable of outputting multiple signal formats.

Disclosure of Invention

In view of the above, the present invention is directed to a multi-format signal output testing apparatus, which is capable of outputting signals of any format and has a low cost.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

an apparatus for testing multi-format signal output, the apparatus comprising: the device comprises a CAN signal receiving unit, a calculating unit, a proportional amplifying unit, an armature and at least one Hall chip, wherein the CAN signal receiving unit is used for receiving CAN signals; the calculation unit is used for calculating and outputting a PWM signal according to the CAN signal; the proportional amplification unit is used for outputting current to a winding coil of the armature according to the PWM signal so as to generate a magnetic field; the at least one Hall chip is located in the magnetic field and used for outputting signals in a corresponding format.

Further, the at least one Hall chip is located in the center of the cross section of the armature.

Further, the signal output by the at least one hall chip comprises at least one of the following signals: analog, PWM, send, and SPC.

Further, when the signal output by the at least one hall chip includes a PWM signal, the computing unit is further configured to: and carrying out feedback regulation according to the duty ratio of the PWM signal output by the Hall chip so as to regulate the duty ratio of the PWM signal output by the Hall chip.

Further, the scale amplifying unit includes: the circuit comprises a conversion circuit, an RC circuit and an amplifying circuit, wherein the conversion circuit converts the PWM signal output by the calculation unit into a voltage signal; the RC circuit is used for stabilizing the voltage signal and outputting a direct current voltage signal; the amplifying circuit is used for amplifying the direct current voltage signal and outputting the direct current voltage signal to a winding coil of the armature so as to generate a magnetic field.

Further, the scale amplifying unit further includes: and the relay is connected between the amplifying circuit and the armature and used for adjusting the current direction in the winding coil of the armature by opening and closing.

Further, the duty ratio of the PWM signal output by the calculating unit and the magnetic field strength of the magnetic field are in a linear relationship.

Further, the number of the at least one hall chip is 4.

Further, the apparatus further comprises: and the display unit is used for displaying various numerical values used and generated by the test device for outputting the multi-format signals.

Further, the apparatus further comprises: and the CANape unit is used for outputting the CAN signal.

Compared with the prior art, the test device for multi-format signal output has the following advantages:

the CAN signal receiving unit is adopted to receive CAN signals, the calculating unit calculates and outputs PWM signals according to the CAN signals, the proportional amplifying unit outputs current to a winding coil of the armature according to the PWM signals so as to generate a magnetic field, and the at least one Hall chip is located in the magnetic field and used for outputting signals in corresponding formats. The device can output signals in any format, uses common elements and has low cost.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In the drawings:

FIG. 1 is a block diagram of a testing apparatus for multi-format signal output according to an embodiment of the present invention;

FIG. 2A is a schematic diagram of a position of at least one Hall chip according to an embodiment of the invention;

FIG. 2B is a schematic diagram of the position of at least one Hall chip A-A according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a scale-up unit according to an embodiment of the invention;

fig. 4 is a block diagram of a testing apparatus for multi-format signal output according to another embodiment of the present invention.

Description of reference numerals:

101 CAN signal receiving unit 102 computing unit

103 proportional amplifying unit 104 armature

301 converting circuit 302RC circuit

303 amplifying circuit 401 display unit

402 CANape unit

Detailed Description

In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1 is a block diagram of a testing apparatus for multi-format signal output according to an embodiment of the present invention.

As shown in fig. 1, the apparatus includes:

the device comprises a CAN signal receiving unit 101, a calculating unit 102, a proportional amplifying unit 103, an armature 104 and at least one Hall chip, wherein the CAN signal receiving unit 101 is used for receiving CAN signals; the calculating unit 102 is configured to calculate and output a PWM signal according to the CAN signal; the proportional amplifying unit 103 is configured to output a current to a winding coil of the armature 104 according to the PWM signal to generate a magnetic field; the at least one Hall chip is located in the magnetic field and used for outputting signals in a corresponding format.

Specifically, the CAN signal receiving unit 101 receives a CAN signal, which may include a target output value, i.e., a physical value, e.g., 2Nm, of the output of the test device requiring the multi-format signal output. The calculation unit 102 converts the CAN signal into a PWM signal, and determines a duty ratio of the PWM signal according to the target output value. The proportional amplifying unit 103 converts the PWM signal into a current, and outputs the current to the winding coil of the armature 104, thereby generating a magnetic field, and the magnitude of the current is related according to the duty ratio of the PWM signal. According to the ampere-loop theorem, the magnetic field strength of the magnetic field generated by the armature 104 and the winding coil is in direct proportion to the current flowing through the winding coil, and because the winding coil is in a constant temperature laboratory and the resistance change of the winding coil is small, the current flowing through the winding coil is in direct proportion to the voltage at two ends of the winding coil, and the voltage at two ends of the winding coil and the magnetic field strength present a linear relationship. Accordingly, the duty ratio of the PWM signal output from the calculation unit 102 is linearly related to the magnetic field intensity as well. In the embodiment of the invention, at least one hall chip is arranged in the magnetic field, and each hall chip can output signals with corresponding formats, such as analog signals, PWM signals, send signals, SPC signals and the like. Therefore, the duty ratio of the PWM signal output by the calculating unit 102 may determine the magnitude of the signal output by each hall chip.

As for an example of a steering wheel input torque sensor used in EPS, common signal types of the steering wheel input torque sensor are PWM, SPC, and analog signals, a hand force direction input by a driver corresponds to a magnetic field direction, the hand force input by the driver is proportional to the magnetic field intensity, a PWM chip and an SPC chip are fixed to a magnetizer of an armature 104, and the hand forces are respectively set to 0Nm and 7Nm when the voltage across a winding coil is 0V and the voltage across the winding coil is 7V; after the calibration of the two Hall chips is completed, the voltage at the two ends of the winding coil is adjusted to observe whether the relation between the voltage and the hand force has deviation, and if the deviation target value can be properly written in software for compensation, the adjustment is carried out.

Fig. 2A is a schematic diagram of a position of at least one hall chip according to an embodiment of the present invention. Fig. 2B is a schematic diagram a-a of a position of at least one hall chip according to an embodiment of the present invention. As shown in fig. 2A-2B, at least one hall chip is located in the center of the cross-section of the armature 104 where the magnetic field strength is nearly equal and oriented perpendicular to the chip. The number of the at least one hall chip may be 4 to provide signals of different formats. Although the PWM and SPC signals are indicated in fig. 2B, this is merely an example, and a hall chip that outputs the two signals is not necessarily provided.

Theoretically, 4 hall chips are in the same magnetic field environment, and the cores of the 4 hall chips are the same and only have different output signal formats, so the tested magnetic field strength values are approximately the same. Therefore, when the signal output by the at least one hall chip includes a PWM signal, the calculating unit 102 may further be configured to: and performing feedback regulation according to the duty ratio of the PWM signal output by the Hall chip so as to regulate the duty ratio of the PWM signal output by the Hall chip. That is to say, for example, a PWM acquisition module (not shown) may be used to acquire a PWM signal output by the hall chip, and when a target output value represented by a duty ratio of the PWM signal output by the hall chip is different from a target output value included in the CAN signal, the computing unit 102 may perform a certain adjustment on the duty ratio of the output PWM signal, so as to adjust the duty ratio of the PWM signal output by the hall chip, complete matching with the target output value, and reduce the influence due to the external electromagnetic environment.

Fig. 3 is a schematic structural diagram of a scale-up unit according to an embodiment of the present invention. As shown in fig. 3, the scale-up unit 103 includes:

a conversion circuit 301 that converts the PWM signal output by the calculation unit 102 into a voltage signal, an RC circuit 302, and an amplification circuit 303; the RC circuit is used for stabilizing the voltage signal and outputting a direct current voltage signal; the amplifying circuit is configured to amplify the dc voltage signal and output the amplified dc voltage signal to the winding coil of the armature 104, so as to generate a magnetic field.

In fig. 3, the left input end is a pin of a PWM wave of the single chip microcomputer, a constant-period rectangular wave with a duty ratio of 0% to 100% is input, and the input rectangular wave passes through a triode of the conversion circuit 301 and then becomes a rectangular wave of, for example, 0V and 12V, and a stable dc voltage value is output after voltage integration processing by the RC circuit 302, and the dc voltage value passes through a triode of the amplification circuit 303 and works in an amplification region to enhance the current output capability of the circuit, thereby modulating the voltage value and the current value at two ends of the coil of the armature 104, wherein the current value is directly proportional to the generated magnetic field intensity, thereby realizing the duty ratio modulation of the PWM of the single chip microcomputer to the magnetic field intensity. In addition, the proportional amplifying unit 103 may further include a relay, connected between the amplifying circuit 303 and the armature 104, for adjusting a current direction in a winding coil of the armature 104 by opening and closing, so as to adjust a generated magnetic field, and thus, a signal output by the hall chip may be changed.

Fig. 4 is a block diagram of a testing apparatus for multi-format signal output according to an embodiment of the present invention.

As shown in fig. 4, the apparatus further includes:

and a display unit 401 for displaying the values used and generated by the test device for outputting the multi-format signals. For example, the voltage value and the current value at two ends of the winding coil, the current direction of the winding coil, the target input value included in the CAN signal, the duty ratio of the PWM signal output by the hall chip, the value feedback-adjusted by the calculating unit 102, and the like are displayed in real time.

A CANape unit 402 for outputting the CAN signal. Firstly, a CAN communication matrix containing physical values (such as torque and the like) is established, a corresponding DBC file is manufactured, the DBC file is added into a CANape project, and a CAN signal is sent out by the CANape. Of course, as described above, the physical value included in the CAN signal may be directly input by a human, or may be adjusted by using a device such as a knob.

In the invention, the CAN signal receiving unit is adopted to receive CAN signals, the calculating unit calculates and outputs PWM signals according to the CAN signals, the proportional amplifying unit outputs current to a winding coil of the armature according to the PWM signals so as to generate a magnetic field, and the at least one Hall chip is positioned in the magnetic field and used for outputting signals with corresponding formats. The device can output signals in any format, uses common elements and has low cost.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. An apparatus for testing multi-format signal output, the apparatus comprising:

a CAN signal receiving unit, a calculating unit, a proportional amplifying unit, an armature and at least one Hall chip, wherein,

the CAN signal receiving unit is used for receiving CAN signals;

the calculation unit is used for calculating and outputting a PWM signal according to the CAN signal;

the proportional amplification unit is used for outputting current to a winding coil of the armature according to the PWM signal so as to generate a magnetic field;

the at least one Hall chip is located in the magnetic field and used for outputting signals in a corresponding format.

2. The apparatus for testing multi-format signal output according to claim 1, wherein the at least one hall chip is located at a center position of a cross section of the armature.

3. The apparatus for testing multi-format signal output according to claim 1, wherein the signal output by the at least one hall chip comprises at least one of the following formatted signals:

analog, PWM, send, and SPC.

4. The apparatus for testing multi-format signal output according to claim 3, wherein when the signal output from the at least one Hall chip comprises a PWM signal, the computing unit is further configured to:

and carrying out feedback regulation according to the duty ratio of the PWM signal output by the Hall chip so as to regulate the duty ratio of the PWM signal output by the Hall chip.

5. The apparatus for testing multi-format signal output according to claim 1, wherein the scale amplifying unit comprises:

a conversion circuit, an RC circuit, and an amplification circuit, wherein,

the conversion circuit converts the PWM signal output by the calculation unit into a voltage signal;

the RC circuit is used for stabilizing the voltage signal and outputting a direct current voltage signal;

the amplifying circuit is used for amplifying the direct current voltage signal and outputting the direct current voltage signal to a winding coil of the armature so as to generate a magnetic field.

6. The apparatus for testing multi-format signal output according to claim 5, wherein the scale amplifying unit further comprises:

and the relay is connected between the amplifying circuit and the armature and used for adjusting the current direction in the winding coil of the armature by opening and closing.

7. The apparatus for testing multi-format signal output according to claim 1, wherein the duty ratio of the PWM signal output by the calculating unit is linear with the magnetic field strength of the magnetic field.

8. The apparatus for testing multi-format signal output according to claim 1, wherein the number of the at least one hall chip is 4.

9. The apparatus for testing multi-format signal output according to claim 4, further comprising:

and the display unit is used for displaying various numerical values used and generated by the test device for outputting the multi-format signals.

10. The apparatus for testing multi-format signal output according to claim 1, further comprising:

and the CANape unit is used for outputting the CAN signal.