CAN-Bus Compatible Step Control Units

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Technical Overview

Our CAN-Bus compatible Step Control Units (ECUs) are built around an Automotive-Grade Microcontroller programmed with read-only communication logic. This advanced ECU passively reads essential vehicle data (door status, vehicle speed, ignition status) from the vehicle's CAN-Bus network without transmitting signals, ensuring non-invasive integration that avoids triggering vehicle error codes or interfering with essential systems.

The ECU features redundant motor control channels and an integrated High-Speed Anti-Pinch Circuit, which continuously monitors the step's position via a positional encoder and current draw, executing soft-stop and reverse in milliseconds upon obstruction detection.

Introduction

Modern vehicles rely on complex electronic networks. Our CAN-Bus ECUs provide the critical, smart interface for electric steps, ensuring the accessory operates in complete harmony with the vehicle's advanced systems. This sophisticated integration is essential for seamless fitment on premium and late-model vehicles.

BHTC’s in-house electronics team develops vehicle-specific firmware tailored to match the unique CAN protocols of various manufacturers (e.g., VAG, BMW, GM). We provide a solution that is intelligent, safe, and highly reliable, simplifying installation for distributors.

Applications

Late-Model Luxury Vehicles: Necessary for seamless integration with BMW, Audi, Mercedes-Benz, and other vehicles where simple analog wiring is insufficient.
Advanced Aftermarket: Serving distributors that require a plug-and-play solution to minimize installation time and electronic risk.
Electric Vehicles (EVs): The non-invasive, low-draw ECU is vital for preserving the battery and preventing interference with complex EV power management systems.
Fleet Diagnostics Integration: Provides a controlled interface for advanced diagnostics and monitoring of step function.

Specification

Processor	Automotive AEC-Q100 Microcontroller
Communication	CAN/LIN Bus Read-Only (Passive)
Safety Logic	Current Sensing & Positional Encoder Anti-Pinch
Quiescent Current	<4 mA (Minimal Battery Draw)
Protection	Reverse Polarity, Transient Voltage Suppression (TVS)
Firmware	Model-Specific, Field-Updatable Firmware
Motor Control	Pulse Width Modulation (PWM) for Smooth Motion

Common Questions

Q: Does the CAN-Bus module require the vehicle's software to be coded?
A: No. Our solution is designed for plug-and-play installation. The module reads the existing CAN data passively, so no vehicle software modification or coding is required.

Q: How quickly does the anti-pinch safety system react?
A: The combined current and positional monitoring system reacts in milliseconds, significantly faster than simple current-overload relays, providing superior protection by initiating an immediate soft-stop and reversal.

Q: Is the unit protected from electrical faults like short circuits?
A: Yes. The ECU is fully protected with overcurrent and short-circuit protection built into the motor driver stage, safeguarding both the ECU and the vehicle's harness.

Core Features

Non-Interference: Passive, read-only logic guarantees that the accessory will not generate error codes or disrupt the vehicle's essential electronic functions.
Precision Motion Control: PWM motor control provides smooth acceleration and deceleration, eliminating jerky motion and reducing mechanical wear.
Field-Updatable Firmware: Allows distributors to quickly update the ECU with new vehicle protocols or feature enhancements without replacing the hardware.
High Reliability Hardware: Utilization of AEC-Q100 certified components ensures the ECU can withstand the harsh thermal and electrical environment of a vehicle.

Production & Customization Services

Production involves a mandatory Hardware-in-the-Loop (HIL) Simulation Test for every ECU to verify protocol compliance and safety logic against simulated vehicle data before shipment.

Customization Opportunities:

Protocol Tailoring: Developing custom firmware for integration into niche vehicle platforms or non-standard protocols required by conversion companies.
Diagnostic Output: Providing a unique diagnostic output port or log feature for clients needing advanced troubleshooting data from the ECU.
Custom Harness Design: Engineering vehicle-specific harnesses that perfectly match the OEM connector positions and lengths for different markets.

Material Selection Guide

The printed circuit board (PCB) is protected by Conformal Coating (a thin polymer film) to guard against humidity and condensation.

The enclosure is a High-Grade, Sealed Polymer Box with integrated strain relief on the wire entry points to prevent water ingress and cable damage.

We use Automotive-Grade Sealed Connectors from recognized suppliers (e.g., TE Connectivity, Delphi) to ensure robust, vibration-resistant electrical connections.

about Bohai

R&D and manufacturing of mid-to-high-end SUV electric pedals.

Bohai Automotive Technology (Zhejiang Huzhou) Co., Ltd. was established in 2014. It is a technology-based enterprise specializing in R&D China CAN-Bus Compatible Step Control Units Manufacturers and Wholesale CAN-Bus Compatible Step Control Units Suppliers The company is located on the southern bank of the beautiful Taihu Lake in the hinterland of the Yangtze River Golden Triangle-Changxing County, Huzhou City, Zhejiang Province. It is about 150 kilometers away from Shanghai, Hangzhou, Nanjing, Ningbo, Suzhou, Wuxi and other large and medium cities.

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