Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ 07458 All.

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Presentation transcript:

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 1 FIGURE 20–1 The electronic stability control (ESC) system applies individual wheel brakes to keep the vehicle under control of the driver.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 2 FIGURE 20–2 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.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 3 FIGURE 20–3 Using a simulator is the most costeffective 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.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 4 FIGURE 20–4 The hand-wheel position sensor is located at the base of the steering column.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 5 FIGURE 20–5 Hand-wheel (steering wheel) position sensor schematic.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 6 FIGURE 20–6 The VS sensor information is transmitted to the EBCM by Class 2 serial data.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 7 FIGURE 20–7 A schematic showing the lateral acceleration sensor and EBCM.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 8 FIGURE 20–8 The lateral accelerometer sensor (G-sensor) is usually located under the center console.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 9 FIGURE 20–9 Yaw rate sensor showing the typical location and schematic.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 10 FIGURE 20–10 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.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 11 FIGURE 20–11 Wheel speed sensor information is used to monitor if a drive wheel is starting to spin.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 12 FIGURE 20–12 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.

Automotive Chassis Systems, 5/e By James D. Halderman Copyright © 2010, 2008, 2004, 2000, 1995 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 13 FIGURE 20–13 The use of a factory scan tool is often needed to diagnose the ESC system.