PTO Engine Speed Calibration via Instrument Cluster Input
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Solution Overview
Problem
Vocational trucks have pre-set engine speed settings for power take-off operations that cannot be altered by operators without expensive tools and software, limiting the ability to set user-desirable speeds, such as 974 RPM, which is not divisible by 5.
Innovation Solution
A system and method that allows operators to calibrate a desirable engine speed for power take-off operations using an instrument cluster unit (ICU) to select a speed value between minimum and maximum values, which is then communicated to a signal actuation module (SAM) and a common power-train control unit (CPC) to modify engine parameters, enabling the programmable engine control unit (ECU) to adjust settings and provide adjusted parameters to a transmission control unit (TCU) to attain the desired speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pre-set engine speed settings are used for PTO operations, then the system maintains simplicity and reliability, but the operator cannot set user-desirable speeds (e.g., 974 RPM not divisible by 5)
Solution Approach 1:
The system enables the operator to independently calibrate the fourth engine speed using the existing ICU interface without requiring external technicians or specialized tools. The operator can directly input the desired speed value (e.g., 974 RPM) through the speedometer interface, and the system automatically processes and applies the calibration, making the service function available to the end-user themselves.
Solution Approach 2:
The existing ICU interface, originally designed for displaying speed information, is made multi-functional by enabling it to also serve as an input interface for speed calibration. The same display and button interface used for viewing PTO speeds is repurposed to allow operators to input and calibrate custom speed values, eliminating the need for separate calibration hardware.
2Ease of operation
If a technician uses specialized tools and software to alter pre-set speeds, then the speed can be modified, but the process becomes costly and time-consuming
Solution Approach 1:
The calibration process is transformed from a technician-performed service requiring specialized tools into a self-service operation that any operator can perform using the existing ICU interface. The operator can complete the calibration independently by navigating through the speedometer display and using the existing control buttons, eliminating the need to wait for technician availability and avoiding tool rental or purchase costs.
Solution Approach 2:
The ICU serves as an intermediary interface that mediates between the operator's desired speed input and the underlying engine control system. Instead of requiring direct access to complex calibration tools, the operator interacts with the familiar ICU display and controls, which then translates these inputs into the appropriate calibration commands for the engine control unit.
3Measurement precision
If technicians alter speeds only by multiples of 5 RPMs, then the system maintains standardized increments, but precise calibration (e.g., 974 RPM) cannot be achieved
Solution Approach 1:
The system changes the parameter of speed increment resolution from fixed multiples of 5 RPM to variable increments allowing any integer value. The calibration process accepts any speed value within the valid range (minimum to maximum PTO speeds), enabling precise calibration to exact values such as 974 RPM that match specialized equipment specifications, rather than being constrained to standardized increments.
4Adaptability or versatility
If three pre-set engine speeds are provided, then the system maintains simplicity, but the operator cannot add a fourth custom speed value
Solution Approach 1:
The fourth custom speed value is nested within the existing three pre-set speed framework. The system maintains the original three factory-fitted speeds while allowing the operator to overlay a fourth custom speed value that can replace or supplement the pre-set options. This nested approach allows expansion of functionality without requiring a complete redesign of the speed selection architecture.
Data Source
AI summary
The present invention relates to a system and method of calibrating a desirable engine speed for power take-off (PTO) operation. In particular, the present invention discloses having an instrument cluster unit (ICU) (102) that allows an operator to select a fourth desirable speed value for PTO operation, and a signal actuating module (SAM) (104) that may be configured to receive the value from the ICU (102) and store the value in its memory. Further, the present invention describes having a common power-train control unit (CPC) connected to the SAM (104) and configured to receive the desirable speed value from the SAM (104), and in response, modify one or more engine parameters to attain the desirable speed value for operating an engine PTO.