Fuel Pump Driver Communication Interruption Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel pump control devices fail to maintain proper operation and prevent abnormal states when communication between the engine control unit and the fuel pump driver is interrupted, leading to potential engine operation issues and unnecessary fuel pump activation.
Innovation Solution
The control device incorporates a fuel pump driver that uses a specific drive command value (DTYMAX) to maintain the fuel pump's stop state during communication interruptions and recognizes ignition switch states through distinct stop and start command values, ensuring the fuel pump is only activated when necessary, even in cases of relay sticking failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel pump driver uses a specific drive command value (DTYMAX) during communication interruption, then the fuel pump can be driven to avoid engine operation issues, but the fuel pump may operate uselessly when the ignition switch is OFF, increasing electrical power consumption
Solution Approach 1:
The fuel pump driver changes its interpretation of the drive control command value DUTY based on communication status. When communication is normal, DUTY is interpreted as a duty ratio for pump speed control. When communication is interrupted, the same DUTY value is reinterpreted as a specific drive command value DTYMAX to maintain a predetermined rotational speed, ensuring reliable engine operation while avoiding unnecessary fuel pump operation that would waste energy
2Use of energy by moving object
If the fuel pump is controlled to stop at idle state to reduce power consumption, then energy efficiency is improved, but abnormal states occur when communication is interrupted causing the pump to stop when it should operate or continue operating when it should stop
Solution Approach 1:
The fuel pump driver continuously monitors the communication status with the engine control unit and uses this feedback to adjust its operation mode. When communication is established, the system operates normally with stop commands at idle states to save energy. When communication is interrupted, the system switches to a fail-safe mode where the fuel pump is maintained at a predetermined rotational speed, ensuring continuous reliable operation despite the loss of communication feedback
3Ease of operation
If the fuel pump driver recognizes ignition switch state through distinct command values, then the fuel pump operation can be precisely controlled, but the device complexity increases due to multiple command value interpretations
Solution Approach 1:
The existing drive control command value DUTY transmission mechanism is made multi-functional. It serves dual purposes: normally transmitting duty ratio information for speed control, and during communication interruption, serving as a specific drive command value DTYMAX to maintain predetermined rotational speed. This eliminates the need for separate command value transmission paths while maintaining precise control capability, thus reducing device complexity without sacrificing control precision
Data Source
AI summary
In the communication interruption state in which the transmission of a drive control command value DUTY from an engine control unit (ECU) 1 to a fuel pump driver (FPD) 2 is disabled, the FPD 2 is configured so as to drive a fuel pump 4 by using the maximum command value DTYMAX (100%) as a drive control command value DUTY. A stop state of the fuel pump 4 is maintained even if the drive control command value DUTY is the maximum command value DTYMAX when an ignition switch 21 is in the OFF State so as to have stopped the fuel pump 4, while the fuel pump 4 is driven when the ignition switch 21 is in the ON state and the drive control command value DUTY is the maximum command value DTYMAX.