乘员离位量检测装置
By installing a transmitter and receiver module in the seat and using a light source and drive circuit to detect occupant displacement, the problems of large error, poor real-time performance and high cost in the prior art are solved. This achieves low-cost and accurate occupant displacement detection, meets the real-time decision-making needs of the vehicle restraint system and protects privacy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZF ASIA PACIFIC AUTOMOTIVE SAFETY SYSTEMS (SHANGHAI) CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-07-17
AI Technical Summary
Existing methods for detecting occupant displacement suffer from problems such as large errors, poor real-time performance, high costs, and poor privacy, especially those based on seat belts and 3D cameras.
The system employs separate transmitting and receiving modules within the seat. By transmitting and receiving ranging signals, it utilizes discretely arranged light sources and independently modulated frequency drive circuits, combined with the ranging circuit, to perform precise distance detection. This enables efficient, low-cost distance detection between the occupant and the seat without the collection of privacy data.
It achieves low-cost and accurate occupant displacement detection, meets the real-time decision-making needs of vehicle restraint systems, reduces hardware size, and protects privacy.
Smart Images
Figure CN224518968U_ABST
Abstract
Claims
1. An occupant out-of-position amount detecting device characterized by comprising: include: A transmitting module, housed in the seat, has a plurality of discretely arranged light sources configured to transmit ranging signals; A driving circuit, connected to the transmitting module, is configured to independently modulate each light source, making the frequencies of each light source different and / or time-division multiplexing; A receiving module, disposed in the seat, has at least one receiver configured to receive a reflected signal of the ranging signal; The ranging circuit, connected to the receiving module, is configured to demodulate and separate the reflected signals of each light source to obtain the ranging value corresponding to each light source.
2. The occupant out-of-position amount detecting apparatus according to claim 1, characterized by The transmitting module has M*N light sources arranged in a square matrix, where M and N are both less than or equal to 5; Alternatively, the transmitting module has P rings arranged in a circular array and Q light sources, wherein P is less than or equal to 3 and Q is less than or equal to 20.
3. The occupant out-of-position amount detecting apparatus according to claim 1, characterized by The number of receivers is less than or equal to the number of light sources, wherein each receiver is configured to receive reflected signals from one or more light sources.
4. The occupant out-of-position amount detecting apparatus according to claim 1, characterized by The light source is a light-emitting diode, the receiver is a photodiode, and both the ranging signal and the reflected signal are infrared light.
5. The occupant out-of-position amount detecting apparatus according to claim 1, characterized by The receiving module further includes a filter disposed in the incident optical path of the receiver, the transmission band of the filter matching the signal band of the light source.
6. The occupant out-of-position amount detecting apparatus according to claim 1, characterized by The driving circuit includes: Frequency synthesizer, configured to generate multiple modulation frequencies; A modulator, connected to the frequency synthesizer, is configured to generate drive signals for each light source based on each modulation frequency. A switch array, connected to the modulator and the transmitter module, is configured to distribute the drive signal to each light source according to a set timing sequence.
7. The occupant out-of-position amount detecting apparatus according to claim 1, characterized by The ranging circuit includes: A bandpass filter, connected to the receiving module, is configured to separate reflected signals of different frequencies; A demodulator, connected to the bandpass filter, is configured to extract the phase difference between the reflected signal and the ranging signal of each light source; A time-to-digital converter, connected to the demodulator, is configured to calculate the distance measurement value corresponding to each light source based on the phase difference of each light source.
8. The occupant out-of-position amount detecting apparatus according to claim 1, characterized by At least the transmitting module and the receiving module are embedded in the headrest of the seat, and the transmitting range of the transmitting module and the receiving range of the receiving module cover a predetermined area in front of the headrest.
9. The occupant out-of-position amount detecting apparatus according to claim 8, characterized by Also includes: A connector configured to communicate with a circuit module embedded in the headrest and a circuit module external to the headrest.
10. The occupant out-of-position amount detecting apparatus according to any one of claims 1 to 9, characterized in that, It also includes any of the following circuit modules: The arithmetic processing unit is connected to the driving circuit and the ranging circuit, and is configured to calculate the head displacement of the occupant based on the ranging value corresponding to each light source. A voltage regulator is connected to the drive circuit, the ranging circuit, and the arithmetic processing unit; A crystal oscillator circuit is connected to the arithmetic processing unit; A bus interface circuit is connected to the arithmetic processing unit; The output circuit is connected to the bus interface circuit and the voltage regulator.