Engine Throttle and Ignition Control for DPF Regeneration Shock Suppression
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Solution Overview
Problem
Increasing the air supply to improve filter regeneration efficiency leads to excessive engine output torque, causing shocks in vehicles during fuel cut.
Innovation Solution
A vehicle system with a control device that adjusts throttle valve opening and ignition timing based on engine temperature, using normal and auxiliary regeneration controls to manage engine torque and suppress shocks during fuel cut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the amount of air supplied to the filter is increased by increasing throttle opening, then regeneration efficiency of the filter is improved, but output torque of the engine becomes too large at the time of returning from fuel cut, causing shock to the vehicle
Solution Approach 1:
The patent changes the parameter of ignition timing (specifically, increasing retard amount) when returning from fuel cut to suppress excessive output torque. By adjusting the ignition timing parameter dynamically based on the fuel cut state and throttle opening, the system prevents large torque fluctuations that cause vehicle shock, while still allowing sufficient air supply for filter regeneration during the fuel cut period.
2Quantity of substance
If the throttle opening is increased during fuel cut, then more air is supplied to improve regeneration, but the engine output torque becomes excessive when fuel cut ends
Solution Approach 1:
The patent applies preliminary action by increasing the retard amount of ignition timing in advance before the engine returns from fuel cut. This preparatory adjustment ensures that when fuel injection resumes, the engine torque does not spike excessively. The control device predicts the upcoming end of fuel cut and pre-adjusts ignition timing to compensate for the torque increase, thereby maintaining smooth power delivery while having allowed high air flow during regeneration.
Data Source
AI summary
An engine having a throttle valve, a filter for collecting an exhaust particulate matter from the engine, and a control device are provided, and the control device includes an acquisition unit for acquiring a temperature of the engine, a regeneration control unit for increasing an opening degree of the throttle valve as the temperature increases, and executing a regeneration control of the filter by a fuel cut. A vehicle comprising: a retard amount control unit that increases a retard amount of an ignition timing at a time of returning from the fuel cut as the temperature increases.