Heat Engine Speed Control for Load-Handling Vehicle
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Solution Overview
Problem
Load-handling vehicles face the challenge of increasing handling movement speed without degrading vehicle comfort and precision, as existing methods to accelerate handling system speed result in increased fuel consumption and inability to optimize heat engine rotation speed.
Innovation Solution
A control unit that determines a heat engine rotation speed setpoint based on data from the accelerator pedal position sensor and hydraulic pump flow rate, allowing for synchronized control of the heat engine's rotation speed with driver inputs, thereby optimizing handling system precision and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the accelerator pedal is pressed to increase the speed of execution of handling system movements, then the handling speed is improved, but the fuel consumption increases and the heat engine rotation speed cannot be optimized
Solution Approach 1:
The control unit dynamically adjusts the heat engine rotation speed parameter based on the accelerator pedal position and hydraulic pump flow rate requirements. By changing the rotation speed parameter in response to operator input and system demands, the system optimizes fuel consumption while maintaining handling speed, resolving the contradiction between productivity and energy use.
2Productivity
If the heat engine rotation speed is increased to accelerate handling movements, then the handling speed is improved, but the vehicle forward movement speed also increases which degrades comfort
Solution Approach 1:
The control system segments the functions of heat engine rotation speed control into two independent control paths: one for handling system speed (via hydraulic pump flow rate) and one for vehicle forward movement (via transmission). This segmentation allows the handling speed to be increased without necessarily increasing the vehicle forward speed, thereby maintaining comfort while improving productivity.
Solution Approach 2:
The control unit continuously monitors the accelerator pedal position and adjusts the heat engine rotation speed accordingly. This feedback mechanism allows the system to respond precisely to operator demands for handling speed while preventing excessive rotation speed increases that would degrade comfort through unintended vehicle movement acceleration.
3Speed
If the control system is made sensitive to accelerator pedal position for handling speed control, then the handling responsiveness is improved, but the control precision is degraded
Solution Approach 1:
The control unit adjusts the heat engine rotation speed parameter based on the accelerator pedal position while considering the hydraulic pump flow rate requirements. This parameter adjustment approach allows the system to be responsive to operator input (improving speed) while maintaining precise control through calculated rotation speed settings rather than direct proportional control, thereby preserving control precision.
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
This approach enables improved comfort and precision in handling movements by matching heat engine rotation speed with driver actions, avoiding overly sensitive controls and optimizing fuel consumption.
Implementation Method 1
a hydraulic pump driven in rotation by the heat engine
Data Source
AI summary
Load-handling vehicle (1) comprising: —a heat engine (2), —an accelerator pedal (3), —a pedal position sensor (4), a system (5) for driving the machine (1), which system is engaged with the heat engine (2), —a handling system (6) comprising at least one handling member (61), a pump (62) rotationally driven by the heat engine (2), at least one actuator (631, 632, 633) of the handling member (61), —a system (7) for controlling the actuators (631, 632, 633), and —a control unit. The control unit is configured to determine: —according to data provided by the control system (7), a pump flow rate setpoint (62), and —according to the pump flow rate setpoint (62) and the position data provided by the pedal position sensor (4), a rotation speed setpoint of the heat engine (2).