Vehicle Drive Force Control Device Ignition Timing Delay
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Solution Overview
Problem
Existing vehicle driving force controllers struggle to effectively reduce driving force while avoiding exhaust gas temperature increases, which can lead to deterioration of exhaust gas purification catalysts, and often result in limited effectiveness in reducing drive slippages and failing to meet strict emission standards.
Innovation Solution
A driving force controller that adjusts throttle opening and ignition timing to reduce engine output, with specific reference values and flags to determine when to use throttle reduction alone or in combination with ignition timing delay, ensuring the ignition timing delay is not prolonged to prevent catalyst deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ignition timing is delayed to reduce engine output with good responsiveness, then the driving force of the vehicle can be reduced with good responsiveness, but the temperature of exhaust gas of the engine increases, which causes deterioration of the exhaust gas purification catalyst
Solution Approach 1:
The patent dynamically adjusts the ignition timing delay control execution time based on actual vehicle operating conditions (drive slippage magnitude, vehicle speed, engine load). When drive slippage is severe and vehicle speed is low, the control execution time is extended to provide effective driving force reduction. When vehicle speed is high or drive slippage is mild, the execution time is restricted to prevent exhaust gas temperature increase. This dynamic adjustment resolves the contradiction between responsiveness and exhaust gas temperature control.
Solution Approach 2:
The patent changes the control parameter (ignition timing delay execution time) based on operating conditions. By varying the execution time parameter according to vehicle speed and drive slippage magnitude, the system achieves optimal balance between driving force reduction effectiveness and exhaust gas temperature control, preventing catalyst deterioration while maintaining good responsiveness when needed.
2Object-affected harmful factors
If the control of completely closing the throttle valve is performed continuously to prevent exhaust gas temperature increase, then the exhaust gas purification catalyst is protected, but the output of the engine cannot be reduced with good responsiveness
Solution Approach 1:
The patent dynamically switches between throttle control and ignition timing delay control based on drive slippage magnitude and vehicle operating conditions. When drive slippage is severe and immediate driving force reduction is needed, ignition timing delay control is activated for its superior responsiveness. When drive slippage is mild or vehicle speed is high, throttle control is used to protect the catalyst. This dynamic switching resolves the contradiction between responsiveness and exhaust gas temperature control.
3Object-affected harmful factors
If the execution time of the ignition-timing delay control is restricted to a predetermined period of time to prevent exhaust gas temperature increase, then the exhaust gas purification catalyst is protected, but the effect of reducing the vehicle driving force through the ignition-timing delay control is limited
Solution Approach 1:
The patent dynamically adjusts the ignition timing delay control execution time based on actual drive slippage magnitude and vehicle speed. When drive slippage is severe (exceeding first reference value) and vehicle speed is low (below second reference value), the execution time is extended beyond the predetermined period to effectively reduce driving force and address the drive slippage. When drive slippage is mild or vehicle speed is high, the execution time is restricted to protect the catalyst. This dynamic adjustment resolves the contradiction between catalyst protection and drive slippage reduction effectiveness.
Data Source
Figure 1A~1B
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AI summary
An object of the present invention is to effectively reduce driving force of a vehicle, when the driving force of the vehicle must be reduced, while avoiding an increase in the temperature of exhaust gas and resultant deterioration of an exhaust gas purification catalyst, the object being achieved by effectively utilizing delaying of the ignition timing or reduction of the fuel supply amount to a possible extent, while preventing elongation of the execution time of control of delaying the ignition timing or control of reducing the fuel supply amount. When the driving force of the vehicle is excessively large, a target driving force Fxt is computed. When an indicator value SAa indicating the degree of necessity of reducing the driving force is equal to or greater than a first reference value SAa1, the throttle opening is reduced so that the driving force of the vehicle decreases more slowly than the target driving force Fxt. When the indicator value SAa is equal to or greater than a second reference value SAa2 greater than the first reference value SAa1, in addition to the reduction of the throttle opening, the ignition timing is delayed so that the driving force of the vehicle decreases faster than does in the case where only the reduction of the throttle opening is performed.