GMW GMW17664 PDF

Introduction

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose. The purpose of this standard is to determine the performance of a vehicle equipped with a Belt, Alternator, Starter (BAS, a Mild hybrid assist system) Power Inverter Module (PIM), or BPIM Regenerative Braking System. The BPIM regulates regenerative braking and coast-down torque to the wheels. During proper Electronic Brake Command Module (EBCM) function, Anti-lock Braking System (ABS), Traction Control System (TCS), and Electronic Stability Control (ESC) regulate brake pressure to the wheels and override all BPIM torque commands to the wheels. From a chassis controls perspective, the concern is to tune the BPIM when the EBCM is not functioning. During an EBCM failure, the BPIM should be calibrated to not intervene with regenerative braking to cause vehicle instability. This standard evaluates system performance under a variety of test surface conditions. This standard may be used for development or validation of requirements within the GM Vehicle Technical Specification (VTS) and for regional regulations.

Applicability. This standard is applicable for vehicles equipped with the BPIM regenerative braking systems.

Remarks. The BAS Control Processor (BCP) is part of the BPIM, this control processor is used to calibrate the BPIM for Calculated Vehicle Speed, Wheel Slip Status and Regeneration Torque Reduction