Method and system for controlling vacuum level of brake assist system

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By measuring and adjusting the exhaust gas recirculation loop and engine valve timing, the cost and space issues caused by the vacuum pump in the spark-ignition internal combustion engine brake assist system were resolved, achieving dynamic adjustment of the vacuum level and improving the driver's braking comfort and safety.

CN122122382APending Publication Date: 2026-05-29HORSE POWERTRAIN SOLUTIONS S L U

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Patent Information

Application Number: CN202480070321.0
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Priority Date: 2023-11-06
Filing Date: 2024-11-05
Publication Date: 2026-05-29

Application Information

Patent Timeline

06 Nov 2023

Priority

05 Nov 2024

Application

CN202480070321.0

29 May 2026

Publication

CN122122382A

IPC: F02D41/00; F02M35/10

CPC: F02D2250/41; F02M35/10229; F02D41/0047; F02D41/0002; F02D2200/0406; F02D2200/602

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Application Domain

Electrical control Machines/engines

Technology Topics

Exhaust gas recirculation Control theory

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AI Technical Summary

Technical Problem

In existing spark-ignition internal combustion engine brake assist systems, the use of a vacuum pump leads to high costs and space integration issues. Furthermore, insufficient vacuum levels increase brake pedal hardness, affecting driver comfort.

Method used

By measuring the vacuum level of the brake assist system, the vacuum level is adjusted using the exhaust gas recirculation loop, including disabling exhaust gas recirculation and adjusting engine valve timing or lift, to increase the vacuum in the intake distributor and avoid the use of the vacuum pump.

Benefits of technology

Without increasing costs or space requirements, the vacuum level of the brake assist system can be effectively adjusted to improve driver braking comfort and ensure safe vehicle braking.

✦ Generated by Eureka AI based on patent content.

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Abstract

A method for monitoring an internal combustion engine (1) of a motor vehicle having an exhaust gas recirculation circuit (8) for monitoring a vacuum level in a brake assist system (3), the vacuum level of the brake assist system (3) depending on a prevailing vacuum in an air intake distributor (17). The method comprises: at least one step of measuring (E1) a vacuum level in the brake assist system (3); a step of comparing (E2) the measured vacuum level with at least one first threshold value (NOK1); and a step of deactivating (E3) the exhaust gas recirculation in order to increase the vacuum in the air intake distributor (17).

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