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Electronic stability control (ESC) is becoming a standard technology in passenger cars, and because of its effectiveness in reducing serious traffic accidents, its use is spreading to commercial vehicles. ESC is activated by comparing the target vehicle behavior, which is analyzed based on driver operation, with the actual vehicle behavior, which is detected by onboard sensors. The target vehicle behavior is analyzed with an initial steer characteristic (such as a vehicle stability factor Ks) representing a vehicle turning characteristic (understeer, neutral steer, or oversteer). Because Ks changes depending on the payload loading states (such as vehicle mass and location of center of gravity), it varies considerably for commercial vehicles. We analyzed the influence of error in Ks on ESC performance and established a method for the online estimation of Ks. ESC includes the restriction functions of oversteer and understeer.

This paper discusses the effective utilization of tire force for improving vehicle dynamics. A sensing technology that can detect the tire force based on the transformation of the tire and suspension bushing has been developed. By applying this sensing technology, ABS can be controlled around the μ-peak of the tire to shorten the stopping distance.

We have developed a new vehicle dynamics control system that is based on a new concept and uses a new hydraulic modulator. The new algorithm, which reflects the concept and hydraulic modulator, can control a vehicle not only in emergency but also in normal driving situation. This results in excellent vehicle controllability.

An Integrated type Hydraulic Brake Booster has the following benefit; With high pressure source, it can provide strong stopping power for Base Brake, especially beneficial for heavier vehicle, and precise brake control for Vehicle Dynamics Control. With integrated brake control unit, it will provide packaging flexibility and easy installation at vehicle assembly plants. At this time, we developed a new Hydraulic Brake Booster, which is smaller and lighter than previous model even with additional integration of the ECU. This report is to introduce the technology used for New Hydraulic Brake Booster to reduce weight and size, in addition to the contribution to Base Brake Performance and Vehicle Dynamics Control.