Standby Idle with Average Load Calculation
Publication Date: 2017-Feb-15
The IP.com Prior Art Database
Title: Standby Idle with Average Load Calculation
Description: As described below, a standby idle control method that is more responsive to operator commands and
machine demands, is disclosed. In order to reduce fuel consumption during periods of relative inactivity with the engine operating, a vehicle (for example an off‐highway vehicle with a hydraulically actuated boom or bucket) control system may activate one of a number of available idle modes to regulate engine speed (for example RPM’s) to an optimal level based on current operating conditions. Although idle modes may have various identifiers such as economy mode or power mode, for purposes of this disclosure the available vehicle idle modes will be referred to as standby idle mode, low idle mode, and alternate/ultra low idle mode.
The target engine speed of the standby idle mode is between the low idle mode speed (for example 900 RPM) and the alternate/ultra low idle mode speed (for example 700 RPM). For example, the standby idle speed may be 800 RPM. In other words, this standby‐idle acts as an intermediate step between low idle and alternate/ultra low idle. This standby idle condition allows for a faster response for operator commands as compared to the alternate/ultra low idle.
When the vehicle conditions required to enter a standby idle mode are met, a VCU (Vehicle Control Unit) commands the ECU (Engine Control Unit) to decrease the engine speed to a standby idle speed. For example, a standby idle mode may be activated by the VCU if certain continuous idle duration times are met and the duration time is valid. Operating parameters relating to these conditions must be maintained in order for the standby idle mode to remain active. In addition, other criteria such as average load are evaluated (for example percent load at current speed as compared to average percent load at current speed with or wi...