CN217538820U

CN217538820U - Urea pump motor circuit control device

Info

Publication number: CN217538820U
Application number: CN202123417549.5U
Authority: CN
Inventors: 许李俊; 孙精晨; 钱力; 王翼星
Original assignee: SUZHOU ZHOUYANG ELECTRONICS CO Ltd
Current assignee: SUZHOU ZHOUYANG ELECTRONICS CO Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-10-04
Anticipated expiration: 2031-12-31

Abstract

The invention relates to a urea pump motor circuit control device, which is externally connected with an automobile engine controller and an automobile urea pump, and comprises: the communication module is used for acquiring data information of an external automobile engine controller; the urea injection control module is used for controlling the automobile urea pump to inject urea to a target position; the heating module is used for heating a target position of the automobile; the main control module is electrically connected with the sampling module, the communication module, the urea injection control module and the heating module and used for controlling the urea pump motor to work through the urea injection control module and the heating module according to the engine state signals and the ECU data information. Through will all integrated functions of ECU in the past differentiate into independent DCU, simplified system design, when emission regulation innovates, only need upgrade DCU can, reduced automobile ECU's system resource, independent DCU design sprays urea more accurately, and system efficiency is more high-efficient.

Description

Urea pump motor circuit control device

Technical Field

The invention relates to the field of circuit control, in particular to a urea pump motor circuit control device.

Background

With the increasing awareness of the society on environmental protection, national regulations become stricter and stricter, and starting from the country, starting from the engine alone, it is difficult to economically and effectively meet the requirements of the regulations, so that an aftertreatment system needs to be added. The Selective Catalytic Reduction (SCR) technology is the most widely applied route in China for the exhaust after-treatment of only engines. The SCR technology can meet the requirements of the five and six current national regulations in China.

Aftertreatment systems are used to reduce the NOx content of exhaust gases to meet emission requirements. The urea aqueous solution is injected into the exhaust gas by the urea injection unit, and then converts nitrogen monoxide (NO) in the exhaust gas into water and nitrogen dioxide (NO 2) by a chemical reaction in the catalyst. The urea injection amount is determined by the engine operating parameters, such as: exhaust temperature, load and speed.

The SCR aftertreatment system mainly comprises: the system comprises an injection control unit (DCU), a urea supply unit (urea pump), a urea injection unit (urea nozzle), a urea box, an SCR box assembly, a heating system, a sensor and a urea pipeline.

The SCR system mainly used in the market at present has no separate DCU, and the DCU functions are integrated in the ECU of the engine. With the stricter and stricter emission requirements, the way of integrating by the ECU has been difficult to meet the emission requirements, and at the time of the upgrading of the regulations, the ECU will be inevitably upgraded, wasting a lot of time for development, design and verification. There are a few separate DCUs on the market that separate the motor control and urea pump injection units, increasing the complexity of the system as well as occupying more space for installation and production costs.

Disclosure of Invention

Therefore, the circuit control device for the motor of the urea pump is needed to solve the problems that the existing automobile ECU is complex in structure, occupies larger resource space and is higher in production cost.

The utility model provides a urea pump motor circuit controlling means, external automobile engine controller and car urea pump, urea pump motor circuit controlling means includes:

the communication module is used for acquiring data information of an external automobile engine controller;

the urea injection control module is used for controlling the automobile urea pump to inject urea to a target position;

the heating module is used for heating a target position of the automobile;

and the main control module is electrically connected with the sampling module, the communication module, the urea injection control module and the heating module and used for controlling the urea pump motor to work through the urea injection control module and the heating module according to the engine state signal and the ECU data information.

In one preferred embodiment, the urea pump motor circuit control device further includes:

and the power supply module is used for providing working voltage for the sampling module, the communication module, the urea injection control module, the heating module and/or the main control module.

In one preferred embodiment, the power supply module includes:

and the voltage conversion unit is used for connecting a power supply voltage externally and converting the power supply voltage to a target voltage.

In one preferred embodiment, the data information includes ambient temperature information, barometric pressure information, engine speed information and/or engine injection quantity information of the vehicle engine.

In one preferred embodiment, the main control module controls the heating module to heat the automobile pipeline and/or the cooling water valve according to the ambient temperature information pair of the engine.

In one preferred embodiment, the heating module comprises:

at least one heating unit;

and the heating driving circuit is connected with the heating unit and used for heating and driving the heating unit, and the heating driving circuit comprises a driving chip and at least one MOS (metal oxide semiconductor) tube connected with the driving chip.

In one preferred embodiment, the urea injection control module includes:

the urea pump driving unit is used for driving the automobile urea pump to work;

and the nozzle driving unit is used for driving the injection quantity of the automobile urea pump nozzle under the control of the main control module.

In one preferred embodiment, the urea pump motor circuit control device further includes a sampling module, configured to collect a pressure signal of the urea pump to implement pressure closed-loop control, where the sampling module includes:

a pressure sensor;

and the signal processing unit is connected between the pressure sensor and the main control module and is used for processing the signals of the pressure sensor.

In one preferred embodiment, the control module includes an MCU control chip.

The utility model discloses a urea pump motor circuit controlling means is through becoming independent DCU with the integrated all functions differentiation of ECU in the past, has simplified system design, when emission regulation innovates, only need upgrade DCU can, reduced automobile ECU's system resource, independent DCU design sprays urea more accurately, and system efficiency is more high-efficient.

Drawings

Fig. 1 is a schematic diagram of a module structure of a urea pump motor circuit control device according to a preferred embodiment of the present invention;

fig. 2 is a schematic block diagram of a heating module of a urea pump motor circuit control device according to a preferred embodiment of the present invention;

fig. 3 is a schematic diagram of a module structure of a urea injection control module of a urea pump motor circuit control device according to a preferred embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, in a preferred embodiment of the present invention, a urea pump motor circuit control device 100 is disclosed, which is externally connected to an automobile engine controller and an automobile urea pump, wherein the urea pump motor circuit control device 100 comprises a communication module 110, a urea injection control module 120, a heating module 130 and a main control module 140.

The communication module 110 is used for acquiring data information of an external automobile engine controller; in the present embodiment, the data information includes ambient temperature information, atmospheric pressure information, engine speed information, and/or engine injection amount information of the automobile engine.

In this embodiment, the communication module 110 is electrically connected to the vehicle engine controller through a CAN bus, and more specifically, the communication module 110 has a CAN transceiver of type TJA1042, data information is converted into differential CANH and CANL through a physical layer of the CAN transceiver of TJA1042, and then connected to a TVS and a common mode inductor, so as to improve the EMI capability thereof.

The urea injection control module 120 is configured to control an automotive urea pump to inject urea to a target location.

In this embodiment, the urea injection control module 120 includes a urea pump driving unit 121 and a nozzle driving unit 122, and the urea pump driving unit 121 is used for driving the automobile urea pump to work;

the urea pump driving unit 121 integrates a BLDC driving chip and a MOS driver (not shown), so that the overhead of the MCU is reduced, and the MCU can be dedicated to the overall function. Only 6N-channel power MOSFETs are required outside the BLDC driver chip, which is designed specifically for automotive applications. The control mode, the working mode and the control parameters are programmed through an SPI compatible serial interface. The drive unit integration diagnostics provide undervoltage, overheating, and power bridge fault indications, and can protect the power switch under most short circuit conditions.

The nozzle driving unit 122 is used for controlling and driving the injection quantity of the automobile urea pump nozzle by the main control module 140.

The main control module 140 sends out corresponding injection time to open and close the nozzle through the nozzle driving unit 122. The protection provided by the nozzle drive unit 122 includes over-temperature shutdown and warning, over-current shutdown, under-chip/over-voltage diagnostics, open circuit diagnostics, short circuit to power diagnostics.

The heating module 130 is used for heating a target position of an automobile;

specifically, the heating module 130 includes: at least one heating unit 131 and a heating driving circuit 132.

The heating driving circuit 132 is connected to the heating unit 131, and is configured to heat and drive the heating unit, where the heating driving circuit includes a driving chip and at least one MOS transistor connected to the driving chip. The heating drive circuit 132 has an a3944 drive chip.

The heating unit 131 drives the chip to drive three NMOS by the low-side a3944, wherein, the BOXHEATER carries out current monitoring by the current detection resistor and the operational amplifier. The a3944 driver chip is a programmable 6-channel low-side MOSFET predriver suitable for automotive applications. Each channel is fed through a controllable parallel and serial combination and provides sufficient gate drive current to allow PWM control to 10KHz. Each channel provides independent fault diagnostic short circuit and open circuit load diagnostics. Each lane provides an independently programmable fault threshold and blanking time.

The main control module 140 is electrically connected to the communication module 110, the urea injection control module 120 and the heating module 130, and is configured to control the operation of the urea pump motor through the urea injection control module and the heating module according to the engine status signal and the ECU data information.

In one preferred embodiment, the control module includes an MCU control chip.

In this embodiment, the main control module controls the heating module to heat the automobile pipeline and/or the cooling water valve according to the ambient temperature information pair of the engine.

In this embodiment, the urea pump motor circuit control device 100 further includes a power supply module 150, and the power supply module 150 is configured to provide a working voltage for the communication module 110, the urea injection control module 120, the heating module 130, and/or the main control module 140.

Specifically, the power supply module 150 includes a voltage conversion unit, which is used for externally connecting a power supply voltage and converting the power supply voltage to a target voltage.

In more detail, the on-board battery supplies power to the control board via the relay at about 28V. The pump motor is powered from a three-phase full bridge via the power supply module 150. The 28V power supply generates +5V voltage to supply power to the system through the voltage conversion unit, and simultaneously generates +5V power supply to independently supply power to the pressure sensor through the voltage follower. When the power supply of the external pressure sensor is short-circuited to the ground, the voltage follower can cut off the power supply, and the system can still work normally at the moment.

In one preferred embodiment, the urea pump motor circuit control device further comprises a sampling module, which is used for collecting a pressure signal of the urea pump to realize pressure closed-loop control; the sampling module comprises:

a pressure sensor;

The power supply of the pressure sensor is provided by a voltage follower, so that the main power supply is not influenced when the external pressure sensor is short-circuited. The sensor model is divided by R89, filtered by a pi filter composed of two capacitors and a resistor, and then sampled by an ADC pin of the MCU chip of the main control module 140.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a urea pump motor circuit controlling means, external automobile engine controller and car urea pump which characterized in that, urea pump motor circuit controlling means includes:

the heating module is used for heating a target position of the automobile;

the sampling module is used for acquiring a pressure signal of the urea pump to realize pressure closed-loop control;

2. The urea pump motor circuit control device according to claim 1, further comprising:

and the power supply module is used for providing working voltage for the communication module, the urea injection control module, the heating module and/or the main control module.

3. The urea pump motor circuit control device of claim 2, wherein the power supply module comprises:

4. Urea pump motor circuit control according to claim 1, characterized in that the data information comprises ambient temperature information of the vehicle engine, barometric pressure information, engine speed information and/or engine injection quantity information.

5. The urea pump motor circuit control device of claim 4, wherein the main control module controls the heating module to heat an automobile pipeline and/or a cooling water valve according to the ambient temperature information pair of the engine.

6. The urea pump motor circuit control of claim 1, wherein the heating module comprises:

at least one heating unit;

7. The urea pump motor circuit control device of claim 1, wherein the urea injection control module comprises:

8. The urea pump motor circuit control of claim 1, wherein the sampling module comprises:

a pressure sensor;

9. The urea pump motor circuit control device of claim 1, wherein the control module comprises an MCU control chip.