阅读说明：本技术 汽车轮速信号处理电路及汽车 (Automobile wheel speed signal processing circuit and automobile ) 是由 王翔宇 李亮 魏凌涛 于 2019-11-04 设计创作，主要内容包括：本申请提供了一种汽车轮速信号处理电路及汽车。所述汽车轮速信号处理电路包括钳位电路、第一滤波电路、运算放大电路以及比较电路；其中,第一滤波电路,与安装在汽车上的轮速传感器电连接,以接收并过滤轮速传感器采集的汽车轮速信号；钳位电路,与第一滤波电路电连接,以将汽车轮速信号的电压幅值限制在汽车控制器以及所述比较电路的可接受范围内；运算放大电路,与钳位电路的输出端电连接,以放大所述汽车轮速信号；比较电路,分别与所述放大电路的输出端和汽车控制器的输入端电连接,以将处理后的汽车轮速信号输入至控制器。本申请通过对汽车轮速传感器采集的汽车轮速信号进行处理,以便于控制器识别汽车轮速信号,提高车速的精确测量。(The application provides automobile wheel speed signal processing circuits and an automobile, wherein the automobile wheel speed signal processing circuits comprise clamping circuits, filter circuits, operational amplification circuits and comparison circuits, wherein the filter circuits are electrically connected with wheel speed sensors installed on the automobile to receive and filter automobile wheel speed signals collected by the wheel speed sensors, the clamping circuits are electrically connected with the filter circuits to limit the voltage amplitude of the automobile wheel speed signals within an acceptable range of an automobile controller and the comparison circuits, the operational amplification circuits are electrically connected with the output ends of the clamping circuits to amplify the automobile wheel speed signals, and the comparison circuits are respectively electrically connected with the output ends of the amplification circuits and the input ends of the automobile controller to input the processed automobile wheel speed signals to the controller.)

A wheel speed signal processing circuit for automobiles is characterized by comprising a clamping circuit, a filter circuit, an operational amplifier circuit and a comparison circuit,

the filter circuit is electrically connected with a wheel speed sensor installed on a vehicle to receive and filter a vehicle wheel speed signal acquired by the wheel speed sensor;

the clamping circuit is electrically connected with the th filter circuit so as to limit the voltage amplitude of the automobile wheel speed signal within the acceptable range of an automobile controller and the comparison circuit;

the operational amplification circuit is electrically connected with the output end of the clamping circuit so as to amplify the automobile wheel speed signal;

and the comparison circuit is respectively and electrically connected with the output end of the amplifying circuit and the input end of the automobile controller so as to input the processed automobile wheel speed signal to the controller.

2. The vehicle wheel speed signal processing circuit of claim 1, further comprising a static self-test circuit electrically connected to the clamping circuit for checking whether the wheel speed sensor is operating properly.

3. The wheel speed signal processing circuit of claim 2, wherein the static self-test circuit comprises a high-side switch circuit and a low-side switch circuit, the high-side switch circuit is electrically connected to the power supply and the th output terminal of the th filter circuit, respectively, and the low-side switch circuit is electrically connected to the ground terminal and the second output terminal of the th filter circuit, respectively.

4. The wheel speed signal processing circuit of claim 3, wherein the low side switch circuit comprises an MOS tube control switch, a source of the MOS tube control switch is electrically connected to a ground terminal, a drain of the MOS tube control switch is electrically connected to the second output terminal of the th filter circuit, and a gate of the MOS tube control switch is electrically connected to the signal control terminal, so as to control on/off of the static self-test circuit and the ground terminal.

5. The wheel speed signal processing circuit of claim 4, comprising a plurality of the low-side switch circuits, wherein each of the low-side switch circuits corresponds to signal control terminals.

6. The wheel speed signal processing circuit of claim 3, wherein the low side switch circuit further comprises a diode, a drain of the MOS tube control switch is electrically connected to a cathode of the diode, and an anode of the diode is electrically connected to the second output terminal of the th filter circuit.

7. The wheel speed signal processing circuit of claim 6, wherein the low side switch circuit comprises MOS tube control switches and a plurality of diodes connected in parallel, and the cathode of each diode is electrically connected to the drain of the MOS tube control switch.

8. The wheel speed signal processing circuit of claim 6, wherein the low side switch circuit comprises a plurality of MOS tube control switches and a plurality of diodes connected in parallel, a cathode of each diode is electrically connected to a drain of MOS tube control switches, and a gate of each MOS tube control switch corresponds to signal control terminals.

9. The wheel speed signal processing circuit of claim 1, further comprising a second filter circuit having an input electrically connected to the output of the amplifier circuit and an output electrically connected to the input of the comparator circuit.

10, , wherein the vehicle comprises a wheel speed sensor, a controller and a vehicle wheel speed signal processing circuit according to any of claims 1-9 or , wherein the input of the vehicle wheel speed signal processing circuit is electrically connected with the wheel speed sensor, and the output of the vehicle wheel speed signal processing circuit is electrically connected with the input of the controller.

Technical Field

The application relates to the technical field of automobiles, in particular to automobile wheel speed signal processing circuits and an automobile.

Background

At present, when an automobile wheel speed sensor signal processing circuit works in a wide range, signals generated by a detected device are difficult to be accurately processed, particularly, under the conditions of low-speed and high-speed running of an automobile, wheel speed signals cannot be converted into level signals which can be identified by an automobile controller, and therefore accurate measurement of the speed of the automobile is influenced.

Disclosure of Invention

An object of the embodiment of this application is to provide kinds of car wheel speed signal processing circuit and car for the car wheel speed signal that the car wheel speed sensor gathered is handled, so that the controller discerns the fast signal of car wheel, improves the accurate measurement of speed of a motor vehicle.

In , automobile wheel speed signal processing circuits are applied to the automobile field, and comprise a clamping circuit, a filter circuit, an operational amplifier circuit and a comparison circuit, wherein,

the filter circuit is electrically connected with a wheel speed sensor installed on a vehicle to receive and filter a vehicle wheel speed signal acquired by the wheel speed sensor;

the clamping circuit is electrically connected with the th filter circuit so as to limit the voltage amplitude of the automobile wheel speed signal within the acceptable range of an automobile controller and the comparison circuit;

the operational amplification circuit is electrically connected with the output end of the clamping circuit so as to amplify the automobile wheel speed signal;

and the comparison circuit is respectively and electrically connected with the output end of the amplifying circuit and the input end of the automobile controller so as to input the processed automobile wheel speed signal to the controller.

In , the wheel speed signal processing circuit further comprises a static self-test circuit electrically connected to the clamp circuit for checking whether the wheel speed sensor is working properly.

In , the static self-test circuit comprises a high-side switch circuit electrically connected to a power supply and the th output terminal of the th filter circuit, and a low-side switch circuit electrically connected to a ground terminal and the th output terminal of the filter circuit.

In , the low side switch circuit includes a MOS transistor control switch, a source of the MOS transistor control switch is electrically connected to a ground terminal, a drain of the MOS transistor control switch is electrically connected to the second output terminal of the filter circuit, and a gate of the MOS transistor control switch is electrically connected to a signal control terminal, so as to control on/off of the static self-test circuit and the ground terminal.

In , the wheel speed signal processing circuit includes a plurality of low-side switch circuits, each corresponding to signal control terminals.

In , the low side switch circuit further includes a diode, the drain of the MOS transistor control switch is electrically connected to the cathode of the diode, and the anode of the diode is electrically connected to the second output terminal of the th filter circuit.

In , the low side switch circuit includes MOS transistor control switches and a plurality of diodes connected in parallel, and the cathode of each diode is electrically connected to the drain of the MOS transistor control switch.

In , the low-side switch circuit includes a plurality of MOS transistor control switches and a plurality of diodes connected in parallel, a cathode of each diode is electrically connected to a drain of MOS transistor control switches, and a gate of each MOS transistor control switch corresponds to signal control terminals.

In , the wheel speed signal processing circuit further includes a second filter circuit, wherein an input terminal of the second filter circuit is electrically connected to an output terminal of the amplifier circuit, and an output terminal of the second filter circuit is electrically connected to an input terminal of the comparator circuit.

In a second aspect of the present application, there is also provided automobiles, the automobiles including a wheel speed sensor, a controller and an automobile wheel speed signal processing circuit as described in any of above, wherein an input of the automobile wheel speed signal processing circuit is electrically connected to the wheel speed sensor, and an output of the automobile wheel speed signal processing circuit is electrically connected to an input of the controller.

Compared with the prior art, the application has the following beneficial effects:

1. the method comprises the steps of receiving and filtering automobile wheel speed signals collected by a wheel speed sensor through an filter circuit to filter interference signals in the automobile wheel speed signals, limiting the voltage amplitude of the automobile wheel speed signals within the acceptable range of an automobile controller and a comparison circuit through a clamping circuit, and amplifying the automobile wheel speed signals processed by the clamping circuit through an operational amplification circuit so as to facilitate the comparison circuit to process and output square wave signals recognizable by the controller, thereby improving the accuracy of automobile wheel speed measurement.

2. The application discloses static self-checking circuit, static self-checking circuit with the clamp circuit electricity is connected for whether check wheel speed sensor normally works, in order to eliminate because of the open circuit or the fault conditions such as short circuit that the fast signal processing circuit of fast sensor of the wheel takes place of car, lead to the fast measurement of car wheel to become invalid problem.

3. The self-checking circuit comprises a plurality of low-side switch circuits, wherein each low-side switch circuit corresponds to signal control ends respectively, so that the self-checking of a plurality of automobile wheel speed signal processing circuits is controlled through signal control ends.

4. The utility model provides a low side switch circuit still includes the diode, the drain electrode of MOS pipe control switch with the negative pole electricity of diode is connected, the positive pole of diode with filter circuit's second output electricity is connected to prevent that the fast signal processing circuit of multichannel car wheel from producing mutual interference when the self-checking.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a kinds of automobile wheel speed signal processing circuits provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a wheel speed signal processing circuit of automobiles according to a second embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a kinds of low-side switch circuits provided in embodiment of the present application;

fig. 4 is a schematic structural diagram of types of low-side switch circuits according to the second embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once a item is defined in figures, it need not be further defined and explained by in subsequent figures.