Heating and vibration function assurance system and working method thereof

Abstract

The present invention belongs to the technical field of automobile security system application, and specifically discloses a heating and vibration function security system, including an MCU control unit, an SBC communication module, a motor drive module, an interface circuit, a high-side drive module, an NTC acquisition module, a low-side drive module, and a current acquisition module, etc. The beneficial effects of the heating and vibration function security system of the present invention and its working method are: 1. High and low side drive heating wires are used with NTC temperature feedback, and the heating current is monitored at the same time to see whether it is within the set normal current range, and the safety diagnosis mechanism of this part is added; 2. When the heating system or other systems of the whole vehicle fail, it is necessary to remind the driver, and the motor on the vehicle can be driven to allow the driver to more directly perceive the failure or warning, and the safety diagnosis mechanism of this part is added.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile security system application, and in particular relates to a heating and vibration function security system and a working method thereof. Background Art

[0002] The comfort and safety of driving experience have become a trend in the mass automobile market.

[0003] my country has a vast geography and a large temperature difference between the north and the south, especially in the north. Once winter comes, the cold steering wheel instantly reduces the driver's desire to drive the vehicle. Although there is heating in the car, it takes a long time for the temperature to rise and the efficiency is low. You can also wear gloves to operate the steering wheel, but with a layer of gloves between them, the sensitivity of touch and the operability are not so smooth, so improving the driver's driving comfort poses a challenge.

[0004] The problems with existing automobile protection systems are: 1. Traditional heating wires only have a simple heating function and are single in function. When overcurrent or a heating system failure occurs, the fault cannot be reported to the vehicle computer through electronic equipment, and the system lacks safety mechanism monitoring; 2. When a part of the vehicle fails (such as the vehicle's radar failure, the heating system failure, other functional safety-related functions failure, etc.), there is no faster and more direct tactile way to remind the driver to perceive the fault, and the system lacks safety mechanism monitoring.

[0005] Based on the above problems, the present invention provides a heating and vibration function guarantee system and a working method thereof. Summary of the invention

[0006] Purpose of the invention: The purpose of the present invention is to address the deficiencies in the prior art and provide a heating and vibration function assurance system and a working method thereof, which has a reasonable design, high heating efficiency, fast heating, and vibration feedback, and can ensure the safety of the heating system through external buttons, LED display and other functions.

[0007] Technical solution: On the one hand, the present invention provides a heating and vibration function guarantee system, including an MCU control unit, an SBC communication module, a motor drive module, an interface circuit, a high-side drive module, an NTC acquisition module, a low-side drive module and a current acquisition module; the SBC communication module, the motor drive module, the interface circuit, the high-side drive module, the NTC acquisition module, the low-side drive module and the current acquisition module are respectively connected to the MCU control unit, and the current acquisition module is connected to the high-side drive module; the high-side drive module, the NTC acquisition module and the low-side drive module are respectively connected to the heating wire.

[0008] In the technical solution, the heating and vibration function assurance system also includes a feedback circuit, and the feedback circuit is connected to the motor and the MCU control unit respectively.

[0009] In the technical solution, the heating and vibration function assurance system also includes a UART module arranged on the MCU control unit, wherein the SBC communication module is connected to the UART module.

[0010] In the technical solution, the heating and vibration function assurance system also includes a LIN communication module connected to the SBC communication module.

[0011] In the technical solution, the heating and vibration function guarantee system also includes an external button and an LED display module connected to the MCU control unit.

[0012] Another aspect of the present invention provides a working method of a heating and vibration function assurance system, comprising the following steps: Step 1, the SBC communication module is the power supply and communication interface of the whole vehicle. When the temperature drops to a certain level, the driver can start the heating function through the human-computer interaction interface KEY. Step 2, the MCU control unit collects the level change of the interface circuit, and after data collection and processing, executes the high / low side drive signal to make the heating wire work. At the same time, the temperature of the heating wire is collected through the NTC acquisition module and fed back to the MCU control unit. Step 3, the current sampling circuit samples the working current of the heating wire to the MCU control unit. When the motor drive is mainly faulty or alarming, the vibration is started to remind the driver, and at the same time, it has a motor fault feedback mechanism. Step 4, the MCU control unit feeds back the current heating status information and motor fault status information to the whole vehicle system through the UART module and the SBC communication module through the LIN bus.

[0013] Compared with the prior art, the beneficial effects of the heating and vibration function assurance system and its working method of the present invention are: 1. High and low side drive heating wires are adopted with NTC temperature feedback, and the heating current is monitored at the same time to see if it is within the set normal current range, and a safety diagnosis mechanism for this part is added; 2. When the heating system or other systems of the whole vehicle fail and the driver needs to be reminded, the motor on the vehicle can be driven to allow the driver to perceive the fault or warning more directly, and a safety diagnosis mechanism for this part is added. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a module system block diagram of the heating and vibration function assurance system of the present invention;

[0015] Figure 2 and Figure 3 It is the electrical schematic diagram of the heating and vibration function assurance system of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figure 1 , Figure 2 and Figure 3 The heating and vibration function assurance system shown includes an MCU control unit, an SBC communication module, a motor drive module, an interface circuit, a high-side drive module, an NTC acquisition module, a low-side drive module and a current acquisition module; the SBC communication module, the motor drive module, the interface circuit, the high-side drive module, the NTC acquisition module, the low-side drive module and the current acquisition module are respectively connected to the MCU control unit, and the current acquisition module is connected to the high-side drive module; the high-side drive module, the NTC acquisition module and the low-side drive module are respectively connected to the heating wire.

[0018] Further preferably, the heating and vibration function assurance system also includes a feedback circuit, which is respectively connected to the motor and the MCU control unit; and the heating and vibration function assurance system also includes a UART module arranged on the MCU control unit, wherein the SBC communication module is connected to the UART module; and the heating and vibration function assurance system also includes a LIN communication module connected to the SBC communication module; and the heating and vibration function assurance system also includes an external button and an LED display module connected to the MCU control unit.

[0019] The working method of the heating and vibration function assurance system of the present invention includes the following steps: Step 1, the SBC communication module is the power supply and communication interface of the whole vehicle. When the temperature drops to a certain level, the driver can start the heating function through the human-computer interaction interface KEY. Step 2, the MCU control unit collects the level change of the interface circuit, executes the high / low side drive signal after data collection and processing, and makes the heating wire work. At the same time, the temperature of the heating wire is collected through the NTC (Negative Temperature Coefficient) acquisition module and fed back to the MCU control unit. Step 3, the current sampling circuit samples the working current of the heating wire to the MCU control unit. When the motor drive is mainly faulty or alarming, it starts to vibrate to remind the driver, and at the same time has a motor fault feedback mechanism. Step 4, the MCU control unit feeds back the current heating status information and motor fault status information to the whole vehicle system through the UART module and the SBC communication module through the LIN bus.

[0020] The heating and vibration function assurance system of the present invention mainly realizes the heating and vibration reminder functions. On the basis of realizing these two functions, the safety mechanisms of these two functions are added. The SBC communication module realizes the power supply from 12V to 5V, which is used for the MCU control unit and other circuits that need power supply. At the same time, it exchanges data with the MCU control unit through the UART module and the SBC communication module communication interface, and communicates with the whole vehicle through the LIN bus; in the heating part, the high / low side driver drives the heating wire together, and the NTC is used to detect the temperature of the heating wire in real time. While heating, the current is sampled by the current acquisition module to monitor the working current of the heating wire. This information is collected and processed by the MCU control unit; the motor drive part mainly plays the function of vibration reminder when a fault occurs or the driver is warned. At the same time, a motor drive fault diagnosis circuit (feedback circuit) is added to monitor whether the motor is normal; in the interface circuit part, a human-computer interaction interface is added, and the KEY / LED is used to increase the operability of the driver's use of the system function and the function of driving the external warning LED.

[0021] To achieve problem 1 in the background technology of the present invention, the heating power supply directly uses the 12V power supply function on the vehicle. Before connecting to the high-side driver, a current sampling circuit is added. At the same time, the 12V power passes through the high-side driver to the heating wire, and then returns to the ground through the low-side driver, thus forming a loop;

[0022] When the human-computer interaction KEY is pressed to drive the high and low side I / O to work, the current sampling circuit starts to collect the working current of the heating wire. The normal working current is I=12V / R load When designing the software, an error of ±5% is allowed for I. When I is not within this range, the software can determine that the system is in overcurrent or other abnormal state. load is the resistance of the heating wire, assuming R load =2 ohms, then I=6A, ±5% error is 5.7A~6.3A, if it exceeds this range, it is considered abnormal;

[0023] Before NTC sampling, it will first determine whether the value sampled by NTC is within the preset value range. If it is lower than or higher than the preset value, it will be judged that the system is faulty. If it is within the normal range, the next step will be taken.

[0024] When working at normal current, according to Joule's law, Q=UIt (where Q: heat, U: power supply voltage, I: working current). Assuming the working time is t, it needs to be heated to the preset temperature T, and the error of t±5% is allowed.

[0025] If t is greater than t+5% and has not reached the set temperature T, the heating system will be judged to be faulty.

[0026] If t is less than t-5%, the set temperature T is reached and the heating system is judged to be faulty.

[0027] The implementation of problem 2 in the background technology of the present invention is that when the heating system or the whole vehicle has a fault and needs to remind the driver, the driver is reminded by driving the motor to vibrate.

[0028] The vehicle fault enters through the LIN interface, and is sent by the SBC to the MCU through the internal LIN transceiver, and the MCU processes and drives the external motor drive circuit;

[0029] When the heating system fails, the current sampling circuit and the ADC of the MCU are used to sample the current, and the MCU processes and drives the external motor drive circuit;

[0030] Or through the NTC sampling circuit, the MCU's ADC sampling, and the MCU processes and drives the external motor drive circuit.

[0031] On this basis, a motor feedback circuit is added. When the I / O driving the motor is working, the feedback circuit will monitor the working status of the motor, such as normal, short circuit, or open circuit;

[0032] If there is a fault in the drive motor part, it can be reported to the system through the LIN bus, and the external LED can be driven to light up to serve as a warning.

[0033] The heating and vibration function assurance system and working method of the present invention, on the one hand, adopt high and low side drive heating wires with NTC temperature feedback, and monitor whether the heating current is within the set normal current range, and increase the safety diagnosis mechanism of this part, so that the system is more in line with functional safety requirements. When the system fails, the driver can perceive the fault and take corresponding measures. On the other hand, based on the motor fault feedback system, a fault diagnosis circuit of the motor part is added. Even when the motor drive circuit fails and there is another fault outside that needs to remind the driver, the feedback circuit can be used to remind the driver in another form, thereby improving the system safety and the accuracy of reporting error faults.

[0034] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. Heating and vibration function guarantee system, characterized by: It includes an MCU control unit, an SBC communication module, a motor drive module, an interface circuit, a high-side drive module, an NTC acquisition module, a low-side drive module and a current sampling module; the SBC communication module, the motor drive module, the interface circuit, the high-side drive module, the NTC acquisition module, the low-side drive module and the current sampling module are respectively connected to the MCU control unit, and the current sampling module is connected to the high-side drive module; the high-side drive module, the NTC acquisition module and the low-side drive module are respectively connected to the heating wire; The working method of the heating and vibration function assurance system comprises the following steps: Step 1: The SBC communication module is the power supply and communication interface of the vehicle. When the temperature drops to a certain level, the driver can start the heating function through the human-computer interaction interface KEY; Step 2: The MCU control unit collects the level change of the interface circuit, and after data collection and processing, executes the high / low side drive signal to make the heating wire work. At the same time, the temperature of the heating wire is collected through the NTC acquisition module and fed back to the MCU control unit; Step 3: The current sampling circuit samples the working current of the heating wire and sends it to the MCU control unit. When the motor drive fails or warns, it starts vibrating to remind the driver, and it also has a motor fault feedback mechanism. Step 4: The MCU control unit feeds back the current heating status information and motor fault status information to the vehicle system through the UART module and the SBC communication module via the LIN bus; The heating power supply directly uses the 12V power supply function on the vehicle. Before connecting to the high-side driver, a current sampling circuit is added. At the same time, the 12V power passes through the high-side driver to the heating wire, and then returns to the ground through the low-side driver, thus forming a loop; When the human-computer interaction KEY is pressed to drive the high and low side I / O to work, the current sampling circuit starts to collect the working current of the heating wire. The normal working current is I=12V / R load When designing the software, an error of ±5% is allowed for I. When I is not within this range, the software can determine that the system is in overcurrent or other abnormal state. Before NTC sampling, it will first determine whether the value sampled by NTC is within the preset value range. If it is lower than or higher than the preset value, it will be judged that the system is faulty. If it is within the normal range, the next step will be taken. When working at normal current, according to Joule's law, Q=UIt, where Q: heat, U: power supply voltage, I: working current. Assuming the working time is t, it needs to be heated to the preset temperature T, and the error of t±5% is allowed. If t is greater than t±5% and has not reached the set temperature T, the heating system will be judged to be faulty. If t is less than t±5%, the set temperature T is reached, and the heating system is judged to be faulty; When the heating system or the vehicle has a fault and needs to alert the driver, the motor will vibrate to alert the driver. The vehicle fault enters through the LIN interface, and is sent by the SBC to the MCU through the internal LIN transceiver, and the MCU processes and drives the external motor drive circuit; When the heating system fails, the current sampling circuit and the ADC of the MCU are used to sample the current, and the MCU processes and drives the external motor drive circuit; Or through the NTC sampling circuit, the MCU's ADC samples, and the MCU processes and drives the external motor drive circuit; Motor feedback circuit, when the I / O driving the motor is working, the feedback circuit will monitor the working status of the motor, such as normal, short circuit, or open circuit; If the drive motor fails, it can be reported to the system through the LIN bus, and the external LED will light up to serve as a warning. It also includes a feedback circuit, which is respectively connected to the motor and the MCU control unit; it also includes a UART module arranged on the MCU control unit, wherein the SBC communication module is connected to the UART module; it also includes a LIN communication module connected to the SBC communication module; it also includes an external button and an LED display module connected to the MCU control unit.

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