Exhaust emission control device for vehicles, controls suppression of exhaust gas flow into combustion engine when requirement brake force correlation value is larger than real brake force correlation value

摘要

A detector detects the real brake force correlation value of negative pressure type brake booster. Another detector detects the brake frame correlation value required for the brake booster. When the requirement brake force correlation value is greater than real brake force correlation value, suppression of the exhaust gas flow is controlled by control unit.