CAN-PWM Fuel-Saving Switch Control for Engine Load Matching
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Solution Overview
Problem
Existing fuel-saving multi-state switch systems in commercial vehicles require manual intervention, leading to poor fuel-saving effects due to mismatched load conditions and inconvenient operation.
Innovation Solution
A control circuit comprising a vehicle body ECU, a fuel-saving control unit connected via a CAN bus, and a PWM voltage regulating unit that automatically determines the required gear and outputs corresponding voltage values to control engine speed and torque, eliminating the need for manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual operation of fuel-saving multi-state switch is required, then driver can control gear switching, but operation convenience deteriorates and fuel-saving effect becomes poor due to mismatched load conditions
Solution Approach 1:
The system automatically detects vehicle load conditions through sensors and autonomously switches between gear states without driver intervention. The control unit processes sensor signals and actuates the multi-state switch based on real-time operating conditions, enabling the system to serve itself and eliminate manual operation requirements.
Solution Approach 2:
The system continuously monitors vehicle operating parameters through sensors and feeds this information back to the control unit. Based on the feedback signals indicating load conditions, the control unit automatically adjusts the gear state of the multi-state switch, creating a closed-loop control system that adapts to changing operating conditions in real-time.
2Extent of automation
If automatic control is implemented through CAN bus and PWM signals, then operation convenience improves and real-time control is achieved, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it receives and processes CAN bus signals, interprets sensor inputs, determines optimal gear states, generates PWM control signals, and manages communication between different system components. By consolidating these diverse functions into a single multi-functional control unit, the system achieves high automation while managing complexity through functional integration.
Solution Approach 2:
The PWM voltage regulating unit acts as an intermediary between the digital control unit and the analog actuator system. It converts digital PWM signals from the control unit into analog voltage signals that can directly control the multi-state switch actuator, serving as a bridge that simplifies the interface between different control layers and reduces overall system complexity.
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
The solution provides a reliable, real-time, and efficient fuel-saving mechanism that automatically adjusts engine speed and torque, improving fuel efficiency and driving safety without manual gear operation.
Implementation Method 1
The PWM voltage regulating unit is connected to the fuel-saving control unit to be configured to receive the PWM pulse signal, and the PWM voltage regulating unit is configured to output a voltage value corresponding to the switch gear according to the PWM pulse signal
Data Source
AI summary
A control circuit and method for a fuel-saving multi-state switch is provided. The control circuit comprises a vehicle body ECU, a fuel-saving control unit, and a PWM voltage regulating unit. The fuel-saving control unit is connected to the vehicle body ECU through a CAN bus to collect CAN signals. The fuel-saving control unit determines a switch gear required by a current vehicle according to the CAN signals and outputs a PWM pulse signal having a corresponding duty cycle. The PWM voltage regulating unit is connected to the fuel-saving control unit to receive the PWM pulse signal. The PWM voltage regulating unit outputs a voltage value corresponding to the switch gear according to the PWM pulse signal. The vehicle body ECU is connected to the PWM voltage regulating unit to receive the voltage value, so as to control a speed and torque of an engine according to the voltage value.