In vehicle driving performance evaluation, test drivers find it difficult to control accelerator and brake pedal travel quantitatively, accurately and repeatably. To address this, ZEER provides a brake testing product portfolio covering driving performance assessment and brake system component inspection, including the VMS3400 driving controller (pedal wire control / pedal actuator testing system), static brake disc DTV tester, portable brake drag torque & DTV tester, vehicle DTV tester, brake caliper functional tester, EPB durability / functional test bench, and the DB4 engine tachometer, among others.

The VMS3400 integrates a 100Hz GPS speed sensor and APS/BPS controller, and can replace the driver in controlling the accelerator and brake pedals, repeatedly performing pedal travel control according to specified modes. It serves as an ideal speed controller for chassis dynamometer tests and repeated driving tests on the proving ground. The DTV/LRO series testers measure disc thickness variation (DTV) and lateral runout (LRO) of brake discs on both bench and actual vehicles, providing reliable data for analyzing brake judder and noise caused by brake pressure fluctuation and brake torque fluctuation. The CFT-L brake caliper functional tester and EPB test bench perform caliper performance evaluation, leakage / clamping force / drag torque measurement, and durability and functional tests of the electronic parking brake.

Product Features

·A complete brake testing product line covering driving performance evaluation, brake disc DTV/LRO measurement, brake caliper functions, and EPB durability / functional tests

·The VMS3400 controls the vehicle by simulating APS/BPS signals identical to those of the actual vehicle, supports voltage and SENT protocol travel signals, and enables brake pedal travel and deceleration control on electric / hybrid vehicles through the BPS interface

·The VMS3400 supports test applications such as constant pedal travel, constant acceleration / deceleration, pedal travel change rate, combination mode, speed and engine RPM control, with an optional pedal robot solution; the vehicle can still be driven manually after installation

·Automated test procedures reduce equipment operation, and together with the ActiveDC program for data analysis, results are displayed immediately after the test is completed

·The DT series testers adopt non-contact capacitive displacement sensors and high-precision structures such as air bearings; measurement values are saved by rotation angle and support FFT and order tracking analysis

·The CFT-L adopts frictionless air bearings, non-contact DTV / runout sensors, precise digital torque sensors and high-resolution flow meters

·Each device is equipped with multifunctional analysis software such as Sunware DT-S, PDRAGDTV / pdViewer, Sunware CFT-L, and EPB-Tester

Main Products / Sub-products

VMS3400 driving controller (pedal wire control / pedal actuator testing system)

a driving performance assessment device with a built-in 100Hz GPS speed sensor and APS/BPS controller; it replaces the driver in controlling acceleration and deceleration by simulating APS/BPS signals, automatically executes tests, and measures, stores and classifies data. It is ready for use by disconnecting the original vehicle's APS/BPS connector and connecting it to the unit's port; for vehicles without drive-by-wire, a pedal robot can be added.

DT-S static brake disc DTV tester

a high-precision automated measurement system for disc thickness variation (DTV) and lateral runout (LRO) of brake discs: air-bearing supported, non-contact capacitive displacement sensors (0-1500 μm), rotation speed 0-10 RPM, angular resolution 16 bit (1/65536), fixture accuracy 3 μm or better; it automatically scans the entire disc surface at customer-defined track spacing and provides per-track DTV & LRO, 3D view, cross-section profile, fixture installation error calibration, and FFT order tracking. It accommodates brake discs with diameters of 200-500 mm, thicknesses of 5-55 mm and a maximum weight of 30 kg, and is supplied with Sunware DT-S analysis software.

Portable brake drag torque & DTV tester

used to measure the drag torque and brake disc DTV/LRO of vehicles on a lift, and is easy to move and store; it uses a constant velocity joint (CVJ) to connect the motor drive shaft and the brake disc, allowing a 15° alignment error; motor speed is adjustable from 0-50 RPM, motor drive torque 75 N·m, torque measurement accuracy 0.1% F.S., with 2 non-contact capacitive probes (4 or 6 optional); low rotation-inertia structure, weighing only 42 kg, supplied with PDRAGDTV / pdViewer software supporting FFT and order tracking analysis.

DT-V vehicle DTV tester

non-contact displacement sensors are installed at both ends of the brake disc and vibration sensors on the vehicle to measure DTV/LRO in both non-braking and braking states, and to analyze how DTV caused by increased brake heat leads to brake judder; measurement range 0-2500 μm, 8 sensors (2 pairs on each side), maximum measurement speed 180 km/h, sampling rate 1 MHz, A/D resolution 16 bit, supports manual / automatic brake pedal linked measurement, and is supplied with Sunware DT-D software for various measurements and analyses.

CFT-L brake caliper functional tester

a comprehensive brake caliper functional test system: it applies braking multiple times under set conditions, detects liquid leakage, total flow and braking force, and tests parameters such as drag torque, DTV/LRO and clamping force. Speed 0-50 RPM (±1 RPM), torque 0-12 N·m (0.1% FSO), DTV 0-2500 μm (0.2% FSO), flow 2-2000 mL/min (±0.3% RD), pressure 0-25 MPa (±0.25% FS); universal brake discs (200-400 mm) and caliper mounting fixtures, frictionless air bearings minimize the lower limit of residual drag torque measurement, supplied with Sunware CFT-L measurement and analysis program, including tolerance deviation warnings, periodic component details and statistical data analysis.

EPB durability test bench

capable of durability testing for 12 electronic parking brakes (EPB); each pair of brakes is controlled by 6 independent electronic modules, and three independent hydraulic units provide hydraulic control of three pairs of brakes. A 19-inch cabinet houses a 19-inch display, 6 power supply units of 20 V / 60 A, a dSPACE CAN simulation PC, an Ethernet switch, and hydraulic units with brake fluid reservoir / proportional valve / pressure sensor / exhaust pump; the operating software EPB-Tester provides an editor, control panel, plotting panel and plotter, and measurement data is updated at 100 Hz.

EPB functional test bench

integrated into a mobile 19-inch cabinet, with an EPB actuator fixture with motor and gears on one side and a brake support on the other; a torque sensor and incremental encoder built into the drive shaft measure torque, speed and rotation angle, and a pressure transmitter between the caliper friction pads measures clamping force. The drive cycle includes two phases, engaged (until current cutoff or clamping force cutoff) and disengaged, supports rotation in both directions and manual / automatic voltage setting, calculates actuator input / output power and drive and spindle efficiency, stores measured and calculated values in LDFII data files, and is supplied with EPBPerformance.exe operating software and GdS control module.

DB4 engine tachometer

speed measurement can be performed on any model of gasoline and diesel engines (2-stroke or 4-stroke, single-cylinder to 12-cylinder); when powered from the vehicle battery it supports 1-8 cylinders. Measurement methods include battery signal acquisition, photo sensor + reflector, inductive clamp (distributor ignition system ignition coil), Piezo clamp (diesel injection pipe), and high-pressure common-rail engine inductive clamp.

Car Roll Cage

this titanium alloy roll cage complies with the provisions of the U.S. National Highway Traffic Safety Administration document NHTSA-2001-9663, and is used to reduce the risk of vehicle rollover during cornering or other emergency situations. It features a simple structure and easy operation, and is available in three models: light, standard and heavy.

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