Multifunctional steering wheel switch system with HOD hand-leaving detection and heating functions

Abstract

The utility model discloses a multifunctional steering wheel switch system with HOD hand-leaving detection and heating functions. The multifunctional steering wheel switch system comprises a single-chip microcomputer controller module; the output end of the toggle switch module is electrically connected with the input end of the single chip microcomputer controller module; the input end of the backlight LED module is electrically connected with the output end of the single chip microcomputer controller module; the output end of the touch key switch module is electrically connected with the input end of the single chip microcomputer controller module; the input end of the HOD detection module is electrically connected with the output end of the single chip microcomputer controller module; the touch diaphragm module and the LIN communication module are respectively and electrically connected with the single chip microcomputer controller module in a bidirectional manner; the KL30 voltage detection module is bidirectionally and electrically connected with the single chip microcomputer controller module; and the intelligent high-side driving module is bidirectionally and electrically connected with the single-chip microcomputer controller module. Multi-module integration is carried out based on a single MCU, multiple functions such as hand leaving detection and heating are integrated, and the structure of the steering wheel is optimized.

Description

Technical Field

[0001] The utility model relates to a multifunctional steering wheel switch system with HOD hand-off detection and heating, belonging to the technical field of steering wheel hand-off detection. Background Technique

[0002] With the rapid development of the automotive market, the configurations on vehicles are being updated day by day. Currently, more and more vehicles are equipped with advanced driver assistance systems (ADAS). According to the United Nations Convention UNR79, it is required that all vehicles with lane keeping (LKA) functions must be equipped with HOD monitoring and warning devices by 2021. The driver should keep their hands on the steering wheel to quickly take over the vehicle in case of an emergency. Therefore, the HOD (Hands-off Detection) hand-off detection technology is very necessary.

[0003] Currently, there are two mainstream HOD detection schemes on the market: Scheme A: Steering torque detection scheme: It determines whether there is a hand controlling the steering wheel by detecting the torque applied to the steering wheel. The advantage is simple principle and low cost.

[0004] Scheme B: Capacitive touch detection scheme: It detects whether there is a hand controlling the steering wheel by detecting the influence of the human hand on the capacitance of the steering wheel to the ground. The advantages are that it is not easily deceived, can be detected in zones, and can judge the grasping gesture and position.

[0005] Disadvantages of Scheme A: It is easily deceived. For example, hanging an appropriate weight on one side of the steering wheel can deceive the detection.

[0006] Disadvantages of Scheme B: The implementation cost is high with dual MCUs, the development cycle is long and the difficulty is relatively large. The influence of heating on capacitance detection, the influence of gloves on signals, and the consistency of sensors pose higher requirements for software processing algorithms. Content of the Utility Model

[0007] The utility model designs and develops a multifunctional steering wheel switch system with HOD hand-off detection and heating. Based on a single MCU for multi-module integration, it integrates functions such as hand-off detection and heating into one, optimizes the steering wheel structure, and improves the space utilization rate of the steering wheel.

[0008] The technical solution provided by the utility model is as follows:

[0009] A multifunctional steering wheel switch system with HOD hand-off detection and heating, comprising:

[0010] A single-chip microcomputer controller module;

[0011] A push-button switch module, the output end of which is electrically connected to the input end of the single-chip microcomputer controller module;

[0012] A backlight LED module, whose input end is electrically connected to the output end of the single-chip microcomputer controller module;

[0013] A touch button switch module, whose output end is electrically connected to the input end of the single-chip microcomputer controller module;

[0014] An HOD detection module, whose input end is electrically connected to the output end of the single-chip microcomputer controller module;

[0015] A touch diaphragm module, which is bidirectionally electrically connected to the single-chip microcomputer controller module;

[0016] A LIN communication module, which is bidirectionally electrically connected to the single-chip microcomputer controller module;

[0017] An LDO power module, which is simultaneously electrically connected to the single-chip microcomputer controller module, the toggle switch module, the backlight LED module, the touch button switch module and the LIN communication module;

[0018] A KL30 voltage detection module, which is bidirectionally electrically connected to the single-chip microcomputer controller module;

[0019] An intelligent high-side drive module, which is bidirectionally electrically connected to the single-chip microcomputer controller module.

[0020] Preferably, it further includes:

[0021] An interface, which is bidirectionally electrically connected to the vehicle interface, and the interface is simultaneously electrically connected to the LIN communication module, the LDO power module and the KL30 power detection module.

[0022] Preferably, the connection between the interface and the LIN communication module is bidirectional.

[0023] Preferably, it further includes:

[0024] A heating interface, which is electrically connected to the vehicle interface, and the heating interface is bidirectionally electrically connected to the intelligent high-side drive module;

[0025] The output end of the single-chip microcomputer controller module is electrically connected to the input end of the heating interface.

[0026] Preferably, the output end of the heating interface is electrically connected to the input end of the heating wire and the input end of the NTC sensor.

[0027] Preferably, it further includes: an HOD interface and an HOD sensor. The output end of the HOD detection module is connected to the input end of the HOD interface, and the output end of the HOD interface is connected to the input end of the HOD sensor.

[0028] Advantages of the present utility model: The capacitive HOD solution is implemented using a Microchip single MCU. By applying advanced mutual capacitance sensing technology and embedding a capacitive sensing layer inside the steering wheel, the function similar to capacitive touch buttons is achieved. After the MCU precisely detects the sensing signal, the data is transmitted to other vehicle ECUs via the bus. This solution realizes an all-round sensing configuration for the entire steering wheel area to accurately monitor the driver's hand position and movement, thereby realizing the driver's hands-off detection function.

[0029] The development with a single MCU can greatly shorten the software development cycle. It not only realizes the HOD function but also can integrate functions such as touch buttons, scroll wheels, and steering wheel heating drive, achieving a touch multi-functional steering wheel, optimizing the structural space design of the steering wheel. The realization of multiple functions on a single board improves the utilization rate of the structural space of the steering wheel, reduces the system cost, and improves the human-machine interaction experience at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an integrated block diagram of the HOD hands-off detection and multi-functional steering wheel switch system described in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following further detailed description of the present utility model is provided in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the text of the specification.

[0032] As Figure 1 shown, the present utility model provides a HOD hands-off detection and heated multi-functional steering wheel switch system, including: a toggle switch module 1, a backlight LED module 2, a touch button switch module 3, a HOD detection module 4, a touch diaphragm module 5, a LIN communication module 6, an LD0 power module 7, a KL30 voltage detection module 8, and an intelligent high-side drive module 9.

[0033] The input end of the single-chip microcomputer controller module is electrically connected to the output end of the knob switch module 1. The input end of the backlight LED module 2 is electrically connected to the output end of the single-chip microcomputer controller module. The output end of the touch key switch module 3 is electrically connected to the input end of the single-chip microcomputer controller module. The input end of the HOD detection module 4 is electrically connected to the output end of the single-chip microcomputer controller module. The touch diaphragm module 5 and the LIN communication module 6 are respectively bidirectionally electrically connected to the single-chip microcomputer controller module. The LDO power module 7 is simultaneously electrically connected to the single-chip microcomputer controller module, the knob switch module 1, the backlight LED module 2, the touch key switch module 3, and the LIN communication module 6. The KL30 voltage detection module 8 and the intelligent high-side drive module 9 are respectively bidirectionally electrically connected to the single-chip microcomputer controller module 1. The vehicle interface is bidirectionally electrically connected to the interface and supplies power to the LIN communication module 6, the LDO power module 7, and the KL30 module 8 through the interface. The vehicle interface also supplies power to the heating interface. The output end of the heating interface is electrically connected to the input end of the heating wire and the input end of the NTC sensor. The input end of the heating interface is electrically connected to the output end of the single-chip microcomputer controller module and is bidirectionally electrically connected to the intelligent high-side drive module 9. The output end of the HOD detection module 4 is connected to the input end of the HOD interface, and the output end of the HOD interface is connected to the HOD sensor.

[0034] The single-chip microcomputer control module collects the analog signal of the switch voltage dividing circuit in the knob switch module 1 through the ADC port, and realizes the switch function through the program judgment in the single-chip microcomputer controller module. The single-chip microcomputer control module drives the backlight LED module 2 to work in the PWM mode. The single-chip microcomputer controller collects the analog signal of the switch voltage dividing circuit in the touch key switch module 3 through the ADC port, and realizes the switch function through the program judgment in the single-chip microcomputer control module. The single-chip microcomputer controller module realizes the function of detecting the HOD of the steering wheel by detecting the capacitance change signal on the HOD sensor held by the steering wheel. The single-chip microcomputer controller module realizes the touch switch function by detecting the capacitance change signal of the diaphragm touch in the touch diaphragm module 5.

[0035] The LDO power module 7 is simultaneously electrically connected to the single-chip microcomputer controller module, the knob switch module 1, the backlight LED module 2, the touch key switch module 3, and the LIN communication module 6, and converts the 12V voltage into 5V voltage to realize the power supply function for the steering wheel switch system. The single-chip microcomputer controller module and the LIN communication module 6 communicate with the vehicle through the LIN protocol. The output end of the LIN communication module 6 is connected to the input end of the LDO power module 7, and controls the operation of the LDO power module 7 through the INH port to realize the communication wake-up function.

[0036] The single-chip microcomputer controller module collects the circuit analog signal in the KL30 power detection module 8 through the ADC port, and realizes the KL30 voltage detection function through the judgment of the program in the single-chip microcomputer controller module; the single-chip microcomputer controller module controls the intelligent high-side drive module 9 in PWM mode to realize the function of steering wheel heating.

[0037] This utility model is developed based on a single MCU, which greatly shortens the software development cycle. It not only realizes the HOD function, but also can integrate functions such as touch buttons, rollers and steering wheel heating drive, etc., to realize a touch multi-functional steering wheel, optimize the structural space design of the steering wheel, and improve the utilization rate of the structural space of the steering wheel with a single board. While reducing the system cost, it improves the human-computer interaction experience.

[0038] Although the implementation of this utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation. It can be fully applied to various fields suitable for this utility model. For those familiar with this field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, this utility model is not limited to the specific details and the illustrated and described examples here.

Claims

1. A multifunctional steering wheel switch system with HOD (hands-off detection) and heating functions, characterized in that, Comprising: Single-chip microcomputer controller module; Button switch module, whose output end is electrically connected to the input end of the single-chip microcomputer controller module; Backlight LED module, whose input end is electrically connected to the output end of the single-chip microcomputer controller module; Touch key switch module, whose output end is electrically connected to the input end of the single-chip microcomputer controller module; HOD detection module, whose input end is electrically connected to the output end of the single-chip microcomputer controller module; Touch diaphragm module, which is bidirectionally electrically connected to the single-chip microcomputer controller module; LIN communication module, which is bidirectionally electrically connected to the single-chip microcomputer controller module; LDO power module, which is simultaneously electrically connected to the single-chip microcomputer controller module, the button switch module, the backlight LED module, the touch key switch module and the LIN communication module; KL30 voltage detection module, which is bidirectionally electrically connected to the single-chip microcomputer controller module; Intelligent high-side drive module, which is bidirectionally electrically connected to the single-chip microcomputer controller module.

2. The HOD off - hand detection and heating multifunctional steering wheel switch system according to claim 1, wherein, Further comprising: Interface, which is bidirectionally electrically connected to the vehicle interface, and the interface is simultaneously electrically connected to the LIN communication module, the LDO power module and the KL30 voltage detection module.

3. The HOD off-hand detection and heating multifunctional steering wheel switch system according to claim 2, wherein The connection between the interface and the LIN communication module is bidirectional.

4. The HOD off-hand detection and heating multifunctional steering wheel switch system according to claim 3, wherein, Further comprising: Heating interface, which is electrically connected to the vehicle interface, and the heating interface is bidirectionally electrically connected to the intelligent high-side drive module; The output end of the single-chip microcomputer controller module is electrically connected to the input end of the heating interface.

5. The multifunctional steering wheel switch system with HOD hand-off detection and heating according to claim 4, wherein, The output end of the heating interface is electrically connected to the input end of the heating wire and the input end of the NTC sensor.

6. The multifunctional steering wheel switch system with HOD off - hand detection and heating according to claim 5, characterized in that, Further comprising: HOD interface and HOD sensor, the output end of the HOD detection module is connected to the input end of the HOD interface, and the output end of the HOD interface is connected to the input end of the HOD sensor.

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