Injection Quantity Adaptation via Torque Feedback
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Solution Overview
Problem
Existing methods for adapting injection quantities in internal combustion engines of mild hybrid and starter generator vehicles face limitations, particularly in modes like sailing, where overrun phases are reduced, leading to less adaptation and increased effort due to various transmission and clutch variations.
Innovation Solution
A method that determines injection quantities through minimum-quantity test injections based on resultant torque, allowing adaptation without overrun phases, and compensates torque increases via electric motor regulation, applicable in starting, shut-down, and sailing modes with reduced effort and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the MFMA method is used for adapting injection quantities, then adaptation accuracy is improved, but the method becomes inapplicable in sailing mode where overrun phases are reduced
Solution Approach 1:
The patent transitions from a static adaptation method (MFMA requiring specific overrun phases) to a dynamic method that adapts to different operating modes. The new method uses test injections during electric motor-driven phases (including sailing mode) to determine correction variables, enabling continuous adaptation across varying operational conditions rather than being restricted to specific phase types.
Solution Approach 2:
The patent changes the fundamental parameter used for adaptation from relying on overrun phase characteristics to using test injection torque measurements. By measuring the torque increase caused by test injections during electric motor-driven phases and converting this to fuel mass, the system achieves adaptation accuracy without depending on the presence of traditional overrun phases, thus resolving the contradiction between precision and versatility.
2Measurement precision
If the MFMA method is activated frequently, then adaptation precision is improved, but the system complexity and effort increase due to numerous transmission and clutch variations
Solution Approach 1:
The patent replaces the mechanical system dependency (transmission/clutch variations affecting overrun phases) with an electrical measurement system. By using the electric motor's torque measurement capability to detect the torque increase from test injections and converting this to fuel mass, the system eliminates the need to account for mechanical transmission variations, thereby reducing system complexity while maintaining adaptation precision.
Solution Approach 2:
The patent introduces an intermediary measurement approach using test injections as a mediator between the injection system and the adaptation algorithm. Instead of directly analyzing complex transmission behaviors during overrun, the system uses standardized test injections to create a consistent, measurable torque signal that serves as an intermediary for determining correction variables, simplifying the adaptation process across different transmission configurations.
3Measurement precision
If test injection quantity is increased to improve measurement accuracy, then injection quantity determination precision is improved, but the torque increase requires additional compensation effort
Solution Approach 1:
The patent implements a feedback mechanism where the torque increase from test injections is measured and used to calculate correction variables. The electric motor controller receives feedback about the torque increase and adjusts its output accordingly, compensating for the additional torque while maintaining overall system stability. This feedback loop enables accurate measurement without requiring excessive compensation effort, as the system continuously monitors and adjusts based on actual conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient adaptation of injection quantities in various operating conditions without requiring overrun phases, reducing application effort and maintaining system performance across different modes, including sailing and idling, with improved flexibility and speed.
Implementation Method 1
in an operating phase in which the electric motor of the motor vehicle drives the internal combustion engine
Implementation Method 2
at least one minimum-quantity test injection into a cylinder of the internal combustion engine is performed, the associated injection quantity is determined via the resultant torque
Implementation Method 3
the increase in torque of the internal combustion engine achieved via the test injection is compensated for by regulating the electric motor
Data Source
AI summary
A method for adapting an injection quantity in an injection system of an internal combustion engine of a mild-hybrid motor vehicle or motor vehicle having a starter-generator or integrated starter-generator is disclosed. In an operating phase in which the e-machine of the motor vehicle drives the internal combustion engine, at least one small-quantity test injection is performed into a cylinder of the internal combustion engine. The associated injection quantity is determined based on a resulting torque. Corresponding correction variables for the adaptation of the injection quantity are determined therefrom. The method may eliminate the need to perform test injections during overrun phases of the internal combustion engine.