The system for monitoring CO, CO2 and CH4 concentration as part of vehicle-based electronic systems allows: to determine the excess of CO, CO2 and CH4 concentrations above the set thresholds at critical points on board the vehicle (canopy, cabin) in real time; to collect, store and update information on excessive CO, CO2 and CH4 concentrations above the set thresholds; to provide interaction with the on-board security system via the CAN interface.
Benefits
- reducing the risk of harm to life and health
- minimization of social and environmental damage
- maximum autonomy in making a decision on dangerous gas concentrations
- capability to transmit information on the sensors operation to the car dashboard
- sound alarm to attract the driver's attention
- capability to operate in power saving mode
- capability to simultaneously operate with six sensors connected
Configuration
- central control unit
- methane concentration excess sensor – DPK-CH4
- carbon monoxide concentration sensor – DPK-CO
- excessive carbon dioxide concentration sensor – DPK-CO2
Principle of Operation
For the most efficient functioning and operation of the system, all concentration excess sensors are implemented in the format of maximum autonomy in making a decision on a dangerous concentration of a particular gas.The central control unit is located in the driver's cabin and serves as a system operational status indicator as a whole and each of the sensors connected. All available and necessary information on the system and sensors operational status is displayed using LED indicators with different colors of light.
If there is a signal from any of the dangerous gas concentration excess sensors, the central control unit supplies an audible alarm to attract the driver's attention. The additional function of the central control unit is the capability to transmit information on the sensors operation to the dashboard of the car. The information from the central control unit is transfered to the vehicle information system via the CAN interface in compliance with all the necessary requirements for the transmission protocol.
To determine if there is a possible methane leak when the car is parked with the engine turned off, it is advisable to leave the system running regardless of the position of the ignition key.
For to reduce the energy consumption of the car accumulator battery, which supplies the power to the system when the engine is not running, it is proposed to implement a mode in which, at the command from the central control unit, only the sensors responsible for monitoring methane leakage remain in working condition, and the remaining sensors are switched to a reduced power consumption mode.
The concentration monitoring system allows implementing all the requirements of a potential targeted consumer.
Specifications
| Interface for connecting sensors to the central control unit | CAN |
| Output signal interface | CAN |
|
CO (carbon monoxide) mass concentration monitoring range in the air, mg/m³ |
from 0 to 200 |
|
CO2 (carbon monoxide) mass concentration monitoring range in the air, mg/m³ |
from 0 to 2000 |
|
Limit of allowable relative error in measuring CO and CO2 concentrations, %, not more than |
20 |
|
CH4 mass concentration monitoring range, lower explosive limit (LEL), % |
from 0 to 50 |
|
First system response threshold for CH4 , % LEL |
10 |
|
Second system response threshold for CH4, % LEL |
20 |
|
Allowable relative CH4 concentration measurement error limit, %, not more than |
20 |
|
System response time to CH4 concentration measurement, s, not more than |
5 |
| System response time to CO concentration measurement, s, not more than | 10 |
|
System response time to CO2 concentration measurement, s, not more than |
20 |
|
Monitoring the concentration of CO, CO2 and CH4 with the car moving in the speed range, km/h |
from 0 to 120 |