Electrically Assisted Vehicle Motor Control Circuit Data Verification
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Solution Overview
Problem
Existing electrically assisted vehicles lack a reliable method to confirm the compliance and proper operation of devices communicating with the control circuits, which can lead to inappropriate assistance force generation, potentially violating regulations and affecting ride quality.
Innovation Solution
The implementation of a control circuit and a device with a microcontroller and transmission circuit that communicate using a shared data generation rule, allowing the control circuit to compare received data for compliance, and only permit motor control if the data matches, thereby ensuring appropriate assistance force generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a control circuit uses data from external devices to control the electric motor, then the assistance force can be adjusted according to rider input, but the reliability of the system is reduced because there is no verification mechanism to confirm device compliance and proper operation
Solution Approach 1:
The control circuit generates check data from first data using a data generation rule, compares it with second data received from the device, and uses this feedback loop to verify device compliance before permitting motor control. This feedback mechanism ensures reliability while maintaining ease of operation.
Solution Approach 2:
The control circuit performs preliminary verification by comparing check data with received data before actually controlling the electric motor based on motor control-related data. This preliminary action prevents unauthorized or erroneous control while allowing normal operation when verification succeeds.
2Reliability
If the control circuit implements data verification by generating and comparing check data, then the reliability of motor control is improved, but the device complexity increases due to additional data processing requirements
Solution Approach 1:
The control circuit performs multiple functions using the same data generation rule: it generates check data from first data, and also generates expected data from the same first data for comparison with received second data. This universal approach to data verification reduces overall system complexity while maintaining high reliability.
3Reliability
If the control circuit prohibits motor control when data mismatch is detected, then the regulatory compliance is improved, but the productivity is reduced due to restricted motor operation
Solution Approach 1:
The control circuit applies partial verification - it only prohibits motor control when data mismatch is detected, while allowing full motor operation when verification succeeds. This partial action approach ensures regulatory compliance without unnecessarily restricting productivity during normal operating conditions.
Data Source
AI summary
An electrically assisted vehicle includes an electric motor, a device including a microcontroller and a transmission circuit that sends motor control-related data used to control rotation of the electric motor, and a control circuit that controls the electric motor based on the data. The control circuit and the device both retain the same data generation rule. When the control circuit sends first data to the device, the microcontroller generates second data which at least includes a portion of first reception data having been received, generates third data from the second data by using the rule, and sends, via the transmission circuit, the third data to the control circuit. The control circuit generates fourth data at least from the first data by using the rule, and compares a portion of second reception data received from the device against the fourth data. If the result of comparison indicates a match, the control circuit permits control of the electric motor.