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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.

1 ABS becomes popular standard equipment due to increased demand for vehicle safety from user. That trend requests to make ABS smaller in size and lower in cost. Electronic Control Unit of ABS (ABS/ECU) has to correspond to that request and, further, ABS/ECU should lead system development by integration of ECU with actuator in engine compartment. We have been promoting the above development positively as the developer of ECU. This paper describes the development of high temperature-proof and small sized ABS/ECU composed 2 chips with using ASIC (Application Specific of Integrated Circuit) design and the method of thermal design, suitable for integration with actuator.