CN-121989776-A - Automobile seat heating system

CN121989776ACN 121989776 ACN121989776 ACN 121989776ACN-121989776-A

Abstract

The invention discloses an automobile seat heating system, belongs to the technical field of automobile seat temperature control, and solves the problems of poor heating accuracy, no active fault diagnosis, high energy consumption and single mode of the existing seat heating system. The system comprises a main control unit, a pressure sensing array, a partition temperature sensing module, a partition heating module, a fault self-diagnosis unit and a mode switching unit, wherein the pressure sensing array, the partition temperature sensing module, the partition heating module, the fault self-diagnosis unit and the mode switching unit are electrically connected with the main control unit, the pressure sensing array detects the pressure distribution characteristic of human body contact of a seat, the partition temperature sensing module collects real-time temperature of each heating partition, the fault self-diagnosis unit detects the electrical state and the abnormal temperature of the heating module, the mode switching unit realizes switching of three heating modes of preheating, normal and energy saving, and the main control unit outputs partition heating control signals based on the pressure distribution, the real-time temperature, the fault state and the heating mode.

Inventors

ZHU ZHIMIN
GE JUNYI
HUANG XINGUO

Assignees

安徽星烽汽车科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260320

Claims (8)

1. The automobile seat heating system is characterized by comprising a main control unit, a pressure sensing array, a partition temperature sensing module, a partition heating module, a fault self-diagnosis unit and a mode switching unit, wherein the pressure sensing array, the partition temperature sensing module, the partition heating module, the fault self-diagnosis unit and the mode switching unit are all electrically connected with the main control unit, the pressure sensing array is arranged in a contact area of an automobile seat and is used for detecting pressure distribution characteristics of each partition of the seat and sending the pressure distribution characteristics to the main control unit, the partition temperature sensing module corresponds to the partition heating module one by one and is used for collecting real-time temperatures of each heating partition and sending the real-time temperatures to the main control unit, the fault self-diagnosis unit is respectively electrically connected with the partition heating module and the partition temperature sensing module and is used for detecting electrical parameters and abnormal temperature states of the partition heating module and sending the abnormal temperature conditions to the main control unit, the mode switching unit is used for receiving mode selection instructions of passengers and outputting three heating mode signals of preheating, normal and energy saving to the main control unit, and the main control unit is used for outputting partition heating control signals to the partition heating module based on the pressure distribution characteristics, the real-time temperatures, the fault states and the heating mode signals to the partition heating module so as to realize power adjustment or power on-off of each partition.
2. The automobile seat heating system according to claim 1, wherein the fault self-diagnosis unit comprises a current detection module and a temperature abnormality judgment module, the current detection module detects working current of the partition heating module, the temperature abnormality judgment module compares the partition real-time temperature with a preset temperature threshold, and when the working current exceeds a preset current range or the change rate of the real-time temperature exceeds a preset rate range, the corresponding partition heating module is judged to be faulty.
3. The automobile seat heating system according to claim 1, wherein the fault self-diagnosis unit comprises a current detection module and a temperature abnormality judgment module, the current detection module detects working current of the partition heating module, the temperature abnormality judgment module compares the partition real-time temperature with a preset temperature threshold, and when the working current exceeds a preset current range or the change rate of the real-time temperature exceeds a preset rate range, the corresponding partition heating module is judged to be faulty.
4. The heating system of claim 1, wherein the control logic of the three heating modes of the mode switching unit is: the main control unit controls all the subarea heating modules to operate with rated maximum power until the real-time temperature of each subarea reaches the preset preheating temperature; The main control unit controls the heating modules of the effective contact subareas to control the temperature in a closed loop by a PID algorithm based on the pressure distribution characteristic, and the heating modules of the non-contact subareas stop supplying power; In the energy-saving mode, the main control unit controls the core contact areas of the middle area of the seat cushion and the middle area of the backrest to control the temperature in a closed loop mode through a PID algorithm, the non-core contact area is reduced by 50% of rated power to operate, and the non-contact area stops supplying power.
5. The heating system of the automobile seat according to claim 1, wherein the partition temperature sensing modules are NTC thermistors, each NTC thermistor is arranged close to a heating wire of a corresponding partition, and the acquired real-time temperature precision is +/-0.5 ℃.
6. The automobile seat heating system of claim 1, wherein the main control unit is an automobile central control MCU or an independent seat control MCU, a PID temperature control algorithm and a fault processing program are built in, when a fault signal is received, power supply of a corresponding fault partition is immediately cut off, and fault prompt information is output through an automobile central control screen.
7. The car seat heating system of claim 1, wherein the partition heating module comprises heating wires and power adjusting switches which are in one-to-one correspondence with each core heating partition, and the power adjusting switches are MOS tube high-side switches.
8. The vehicle seat heating system of claim 1, wherein the main control unit controls the output power of the power regulating switch by regulating the PWM duty cycle and converts the high frequency PWM signal to a low frequency on-off signal to avoid pulse radiation.

Description

Automobile seat heating system Technical Field The application relates to the technical field of temperature control of automobile seats, in particular to an automobile seat heating system. Background The automobile seat heating system is an important configuration for improving driving comfort, and the related heating system in the prior art has a plurality of defects that the partial heating system only calculates heating power based on the environment temperature in the automobile and the manually adjusted coefficient of passengers, adopts an integral heating mode, does not combine the actual contact pressure distribution of a human body and the seat to carry out accurate heating, and the synchronous heating of a non-contact area causes a great amount of energy waste and has poor heating pertinence; Although a few heating systems realize the zone heating of the seat, the situation that local overheating or insufficient heating is easy to occur due to the lack of real-time closed-loop feedback of the heating temperature of each zone, the power cannot be dynamically adjusted according to the actual heating temperature, and the driving comfort is poor; The existing heating system has no special self-diagnosis function of the faults of the heating module, when faults such as open circuit and short circuit occur on the heating wire, the system cannot timely detect and take protective measures, potential electrical safety hazards exist, only a single heating mode is set, and the quick heating requirement in the preheating stage and the energy consumption control requirement in normal use cannot be considered. In view of the above problems, there is no automobile seat heating system that combines precise heating, active fault diagnosis and multi-mode energy-saving control, so there is a need for a seat heating system with simple structure and perfect functions to solve the above technical drawbacks. Disclosure of Invention The application provides an automobile seat heating system which adopts the following technical scheme: The automobile seat heating system comprises a main control unit, a pressure sensing array, a partition temperature sensing module, a partition heating module, a fault self-diagnosis unit and a mode switching unit, wherein the pressure sensing array, the partition temperature sensing module, the partition heating module, the fault self-diagnosis unit and the mode switching unit are all electrically connected with the main control unit, the pressure sensing array is arranged in a contact area of an automobile seat and is used for detecting pressure distribution characteristics of each partition of the seat and sending the pressure distribution characteristics to the main control unit, the partition temperature sensing module corresponds to the partition heating module one by one and is used for collecting real-time temperatures of each heating partition and sending the real-time temperatures to the main control unit, the fault self-diagnosis unit is respectively electrically connected with the partition heating module and the partition temperature sensing module and is used for detecting electrical parameters and abnormal temperature states of the partition heating module and sending the abnormal temperature states to the main control unit, the mode switching unit is used for receiving mode selection instructions of passengers and outputting three heating mode signals of preheating, normal and energy saving to the main control unit, and the main control unit is used for outputting partition heating control signals to the partition heating module based on the pressure distribution characteristics, the real-time temperatures, the fault states and the heating mode signals. Further, the pressure sensing array is a film type pressure sensor array, the automobile seat is divided into four core heating subareas including a seat cushion front area, a seat cushion middle area, a seat cushion rear area and a backrest middle area, each core heating subarea is correspondingly provided with at least one pressure sensor, and the pressure distribution characteristics comprise pressure values and effective contact duty ratios of the subareas. The fault self-diagnosis unit comprises a current detection module and a temperature abnormality judgment module, wherein the current detection module detects working current of the partition heating module, the temperature abnormality judgment module compares real-time temperature of the partition with a preset temperature threshold, and when the working current exceeds a preset current range or the change rate of the real-time temperature exceeds a preset rate range, the fault of the corresponding partition heating module is judged. Further, the control logic of the three heating modes of the mode switching unit is as follows: the main control unit controls all the subarea heating modules to operate with rated maximum power until the real-time temperature of each sub