What this page is

This page is for OEM teams sourcing a commercial vehicle sensor manufacturer in China. It covers the tyre-pressure (TPMS) sensors and receivers, rain-light sensors, fuel-level senders and audible annunciators we build, and how each one is specified, validated and produced. The starting point is always your wheel layout, vehicle network and mounting needs rather than a fixed catalogue part number.

The detail below is the qualification pack we share with engineering teams specifying a fleet TPMS rollout, a cab rain-light upgrade or a tank-level instrument. For the engineering background on how tyre-pressure monitoring works and how to write the specification, see the heavy-truck TPMS buyer guide.

Who Youlai is

Changsha Youlai Electronic Technology Co., Ltd. is an IATF 16949 certified OEM electronics manufacturer based in Changsha, Hunan, China. We supply vehicle electronics — sensors and switch panels, body control, power distribution and displays — to commercial-vehicle and construction-machinery OEMs including SANY, XCMG, ZOOMLION, SINOTRUK, YUTONG and BYD. The full named list is on the About page.

Our manufacturing footprint is 3 SMT automated lines, 1 THT automated flow line and 4 standard assembly lines, supported by an in-house environmental laboratory with EMC pre-compliance equipment. The quality system is certified to IATF 16949. Environmental and OH&S system certificates (ISO 14001 / ISO 45001) are shared as current PDFs during qualification — see the OEM sourcing guide for what to verify.

What we make in vehicle sensors

The sensor range covers the measurements a commercial-vehicle programme reads off the wheels, the cab glass and the tanks. The sensor platforms below are published designs we build to your OEM specification:

  • Valve-stem TPMS sensors — the YDK‑902 bolts to the valve stem inside the tyre and reports pressure, acceleration and temperature over a 433.92 MHz frequency-hopping link, with an IP66 sealed PA66-GF30 housing and a 5–8 year battery on a typical commercial-vehicle duty cycle.
  • Clamp-mount TPMS sensors — the YDK‑903 shares the same RF link, sensing payload and battery target but clamps inside the rim with an external whip antenna, for mining, special-trailer and drop-centre wheels whose geometry does not accept a valve-stem sensor. A mixed-wheel fleet runs both variants under one protocol.
  • In-cab TPMS receiver — the EBX‑957 demodulates the 433.92 MHz bursts and forwards per-wheel data to the cluster or body module over a single CAN channel, on a sealed IP67 body and a standard Deutsch DT06-4S 4-pin connector.
  • Rain-light, fuel-level and audible-warning sensors — rain and light sensors for automatic wiper and headlight control (the windscreen-bonded CGQ-024A light & rain sensor for automatic wipers, and the CGQ-012A ambient light & sun-load sensor for auto-lighting and climate), fuel-level senders for trucks and machinery, and buzzers / annunciators are quoted through the same OEM workflow; mounting, signal interface and range are configured per programme.
  • Custom interfaces and ID coding — RF protocol and ID-coding scheme, CAN reporting map, mounting style and connector are all configured on an existing platform rather than drawn from zero.

The full Switches & Sensors catalogue, including the model matrix, is on the Switches and Sensors overview page; buyers consolidating a whole program can also source body control, power distribution, displays and switch panels from the same supplier across the four product families.

A valve-stem TPMS sensor and a clamp-mount TPMS sensor with a whip antenna fitted to a heavy-truck wheel rim
Two TPMS mounting styles on a truck wheel rim: valve-stem for standard rims and clamp-mount for wheels that need a separate fixing point.

How a programme starts

  1. Briefing. Share target vehicle / machine, expected annual volume, the measurement and sensor list (TPMS, rain-light, fuel-level, buzzer), wheel population and rim type for TPMS, working voltage where a receiver is involved (12 V / 24 V), reporting protocol (CAN 2.0 / CAN-FD / J1939), mounting constraint, IP rating, temperature range and connector preference.
  2. Selection or custom. We propose the closest standard platform. If your program needs a different mounting style, sealing class, RF ID scheme, CAN map or connector, we quote a custom variant on the same platform rather than starting from zero. Where the requirement does not map onto any existing platform, we scope it as a new design instead of forcing a fit.
  3. RF protocol & receiver pairing. For TPMS we agree early on the wheel-side sensor style (valve-stem, clamp-mount or both), the ID-coding scheme and which receiver the wheel sensors pair to — the Youlai EBX-957 or an OEM-equivalent. This decision drives commissioning more than any hardware line item.
  4. Sample & validation. Engineering samples for standard variants, with validation supported by our in-house environmental lab and EMC pre-compliance — temperature and vibration, sealing checks, battery-life modelling on the wheel sensors, and a full RF round-trip against the receiver and your body-control simulator.
  5. Mass production. SMT / THT automated lines, in-process inspection, end-of-line functional and RF / CAN-message test, and traceable batch records, with the drawing package, BOM and quality-system documentation released at the milestones agreed with you. Region-specific approvals such as e-Mark / ECE and SASO, and radio approvals such as FCC, are available upon project requirement and confirmed per destination market.

Why programmes pick this supplier

  • Engineering-led, not catalogue-only. Because we own the housing, the PCBA and the RF and CAN integration, a custom mounting style, ID-coding scheme or reporting map is something we quote as part of the normal workflow rather than treat as a special case.
  • RF and protocol depth. We work with the 433.92 MHz frequency-hopping TPMS link and single-CAN receiver reporting day to day; the heavy-truck TPMS guide walks through how a wheel sensor reaches the cluster.
  • Mixed-wheel coverage. Valve-stem and clamp-mount sensors speak one protocol to one in-cab receiver, so a fleet with non-standard rims does not need a second monitoring system.
  • Sealing range. The wheel sensors are IP66 for years of in-wheel service and the receiver is IP67; we document the design rationale behind the IP65 / IP67 enclosures rather than leave it assumed.
  • Full product-family coverage. Buyers consolidating the electronics side of a program can take sensors, switch panels, body control and power distribution from one supplier across the four product families.
  • Direct contact. Sales mobile +86 134 6767 4786, also on WhatsApp.

Get a quote moving

Send a sensor list, the vehicle or machine spec, and the wheel population and bus matrix if you have them to [email protected] or message us on WhatsApp. That lets us map your requirement onto an existing platform, or set out what a custom variant would involve. Typical reply within one business day. NDA on request.