Electronic Throttle Controle System
ABSTRACT
The ETCS system allows the ECM to precisely control the opening and closing of the throttle valve based on drivers input and is also interrelated with chassis control ECUs such as Traction Control and Vehicle Stability Control (Skid Control ECU).
Introduction
The Accelerator Pedal Position Sensor (APPS) detects the accelerator pedal position (driver input) and sends a signal to the ECM. Based on the input from the APPS and other ECUs (ABS, TRAC and VSC), the engine ECM directs the
Throttle Control Motor to change throttle valve position. The Throttle Position Sensor (TPS) detects throttle valve angle and confirms to the ECM that the desired throttle valve position has been achieved. Both the APPS and the TPS have two sensing elements. ➢ Electronic Throttle Control System-intelligence provides several advantages over a mechanical linked throttle valve system as the ECM can position the throttle valve for optimum performance under a variety of conditions. ➢ The ETCS-i system gives the ECM precise control over the opening and closing of the throttle valve, based upon the driver’s input (accelerator pedal). ➢ And in conjunction with input from chassis control ECUs, such as those for Traction Control and Vehicle Stability Control (Skid Control ECU). ➢ This system not only enhances drive line control, but also assists in reducing tailpipe emissions and improving fuel economy.
ETCS Control modes • The ECM drives the throttle valve to a specified angle as determined by operating conditions. • Different throttle valve angles in relation to the accelerator pedal position are used to achieve different engine output characteristics. • The following describes the different modes that affect throttle valve angles. ➢ Non-linear Control - Non-linear control means the ECM can control the throttle valve opening rate and position based on such factors as accelerator pedal effort and engine rpm to
The ETCS system allows the ECM to precisely control the opening and closing of the throttle valve based on drivers input and is also interrelated with chassis control ECUs such as Traction Control and Vehicle Stability Control (Skid Control ECU).
Introduction
The Accelerator Pedal Position Sensor (APPS) detects the accelerator pedal position (driver input) and sends a signal to the ECM. Based on the input from the APPS and other ECUs (ABS, TRAC and VSC), the engine ECM directs the
Throttle Control Motor to change throttle valve position. The Throttle Position Sensor (TPS) detects throttle valve angle and confirms to the ECM that the desired throttle valve position has been achieved. Both the APPS and the TPS have two sensing elements. ➢ Electronic Throttle Control System-intelligence provides several advantages over a mechanical linked throttle valve system as the ECM can position the throttle valve for optimum performance under a variety of conditions. ➢ The ETCS-i system gives the ECM precise control over the opening and closing of the throttle valve, based upon the driver’s input (accelerator pedal). ➢ And in conjunction with input from chassis control ECUs, such as those for Traction Control and Vehicle Stability Control (Skid Control ECU). ➢ This system not only enhances drive line control, but also assists in reducing tailpipe emissions and improving fuel economy.
ETCS Control modes • The ECM drives the throttle valve to a specified angle as determined by operating conditions. • Different throttle valve angles in relation to the accelerator pedal position are used to achieve different engine output characteristics. • The following describes the different modes that affect throttle valve angles. ➢ Non-linear Control - Non-linear control means the ECM can control the throttle valve opening rate and position based on such factors as accelerator pedal effort and engine rpm to
References: http://www.insideline.com/toyota/toyota-throttle-control-and-electromagnetic-interference-testing-presentation.html/ http://auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/electronic-throttle-control-systems1.html/ http://en.wikipedia.org