Electronic Stability Control Systems 25 © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Advanced Automotive.

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OBJECTIVES Discuss the need for electronic stability control (ESC).

ELECTRONIC STABILITY CONTROL SYSTEMS

OBJECTIVES Discuss the need for electronic stability control (ESC).

Electronic Stability Control Systems

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Presentation transcript:

Electronic Stability Control Systems 25 © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ Advanced Automotive Electricity and Electronics James D. Halderman

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE 25.1 The electronic stability control (ESC) system applies individual wheel brakes to keep the vehicle under control of the driver.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE 25.2 The sine with dwell test is designed to test the electronic stability control (ESC) system to determine if the system can keep the vehicle under control.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE 25.3 Using a simulator is the most cost-effective way for vehicle and aftermarket suspension manufacturers to check that the vehicle is able to perform within the FMVSS No. 126 standard for vehicle stability.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE 25.4 The hand-wheel position sensor is usually located at the base of the steering column.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE 25.5 Hand-wheel (steering wheel) position sensor schematic.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE 25.6 The VS sensor information is transmitted to the EBCM by Class 2 serial data.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE 25.7 A schematic showing the lateral acceleration sensor and EBCM.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE 25.8 A lateral acceleration sensor is usually located under the center console and can be easily checked by unbolting it and turn it on its side while monitoring the sensor value using a scan tool. When it is on its side the sensor value should read one G.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE 25.9 Yaw rate sensor showing the typical location and schematic.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE Typical traction control system that uses wheel speed sensor information and the engine controller (PCM) to apply the brakes at lower speeds and also reduce engine power applied to the drive wheels.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE Wheel speed sensor information is used to monitor if a drive wheel is starting to spin.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE A traction control or low traction light on the dash is confusing to many drivers. When the lamp is on or flashing, it indicates that a low traction condition has been determined and the traction control system is working to restore traction. A flashing traction dash light does not indicate a fault.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ FIGURE The use of a factory scan tool is often needed to diagnose the ESC system.

25 Electronic Stability Control Systems Advanced Automotive Electricity and Electronics James D. Halderman © 2013 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458