What the data for this category looks like
Vehicle investment research data sources cover automaker public annual/quarterly financial reports, MIIT motor vehicle product announcements, third-party vehicle performance test reports, supply chain company disclosure documents, and industry association monthly sales statistics. Update cycles vary significantly by data source type. Financial reports are updated quarterly or annually. Vehicle test reports are released with new model launches. Supply chain data is updated monthly.
Document structures include three categories: long text (such as thousands-word review reports, hundreds-page financial report documents), structured tables (including parameters like curb weight, CLTC range, suggested retail price), and scattered announcements. Fields and units have strict standards. For example, range must note the CLTC/NEDC test standard. Body size units are millimeters. Suggested retail price units are Chinese Yuan.
How These Characteristics Create Constraints for Citation Source and Traceability
The coexistence of long text and structured data requires retaining original paragraph identifiers and metadata during traceability. For example, segmented long financial reports must link to original page numbers. Without this, precise citation location is impossible. Structured parameter tables must retain field names and test standards to avoid mixing parameters across different models.
Data sources with multiple update cycles require the traceability system to support filtering source data by release time. This ensures references use the latest version of parameters and announcements. Different document formats (PDF, Excel, web pages) need unified parsing logic, retaining metadata such as publishing organization and release time. Otherwise, traceability cannot confirm source authority.
Strict parameter unit requirements mean traceability must display test standards and units simultaneously. This prevents users from misunderstanding the applicable scenario of referenced content.
Configuration Settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
recallTopK | Top 8-12 entries | Vehicle investment research data has many parameters and complex associated information. Sufficient recalled entries are needed to cover relevant parameters and review content |
similarityThreshold | 0.75-0.85 | Filters low-relevance recall results while retaining subtle parameter differences across batches of the same model |
chunkSize | 800-1200 characters | Adapts to the length of vehicle review text and financial report chapters, balancing recall accuracy and traceability positioning accuracy |
chunkOverlap | 150-200 characters | Retains contextual association when segmenting long documents, ensuring complete paragraphs can be located during traceability |
ENABLE_SOURCE_MATCH_EXACT | Enabled | Forces responses to use original knowledge base text, avoiding AI-generated rewritten content |
PARSE_FILE_TIMEOUT_SECONDS | 600 seconds | Prevents timeout interrupts when processing large financial report PDFs |
The parameter values provided on this page are common starting points for configuration. Actual values are affected by material format, data volume and business rules. Specific issues require targeted analysis. It is recommended to test on your own samples before finalizing settings.
Three Common Misconfigurations
- Phenomenon: Returned responses do not use knowledge base original text, and AI-generated rewritten content appears. Cause: The
ENABLE_SOURCE_MATCH_EXACTparameter is not enabled, or the recall threshold is set too low, resulting in recall of non-target question-answer pairs. - Phenomenon: Source data has been uploaded to the knowledge base, but no citation source field is displayed in the response. Cause: The
SHOW_SOURCE_CITATIONparameter is not set to enabled, or original page numbers or paragraph identifiers of the document were not retained during parsing. - Phenomenon: The indexing process gets stuck with no response, and the log shows an
ETIMEDOUTerror. Cause: ThePARSE_FILE_TIMEOUT_SECONDSparameter is not adjusted, and large financial report PDF parsing times out without triggering a retry mechanism.
How to Verify Proper Configuration
- Upload a vehicle financial report PDF with clear page numbers, run a query, and check the reference column of the returned results to confirm that the document name, page number and publishing organization are displayed.
- Enter a precise parameter query, such as "CLTC range of a certain model", and check whether the returned content directly uses the original text of the structured parameter table in the knowledge base without rewriting.
- Upload a structured Excel parameter table, run a query, and confirm that the citation source includes the table's column names and corresponding field values.
- Simulate an incremental update scenario, upload an updated vehicle parameter document, and check whether the indexing task is completed within the preset time without timeout errors.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.