Monitoring Hybrid Drive System, Basic Function - GF08.30-P-1014A
Model all (PKW)
with Code ME05 (Hybrid drive 85 kW-94 kW - Variant (incl. Plug-in))
Model all (PKW)
with Code ME08 (Hybrid drive 75-84 KW-VARIANT (INCLUDING PLUGIN))
Model all (PKW)
with Code ME10 (Hybrid vehicle)
Overview:
This document contains information on:
- General
- Functional level
- Monitoring of the control unit functions
- Hardware-implemented monitoring function of the control unit monitoring
- Interlock circle
- Decentralized interlock
General
The monitoring within the drive train control unit and power electronics is divided into the following levels:
- Functional level (level 1)
- First monitoring level (level 2)
- Second monitoring level (level 3)
Depending on the type, the interlock monitoring is carried out by means of the interlock circuit by the battery management system control unit or decentrally.
Functional level
All functions of the hybrid drive system implemented in the drive train control unit are contained in the monitoring at the functional level. These are, for example, torque coordination, energy management, sensor and actuator control.
Monitoring of the control unit functions
The first monitoring level (level 2) contains the target / actual comparison of the driver's specified torque (accelerator pedal position) and total drive torque (sum of the torques from the internal combustion engine and electrical machine).
In the drive train control unit, level 2 checks whether the total drive torque generated is greater than that requested by the driver via the accelerator pedal sensor. If this is the case, it is assumed that there is a fault in the drive train control unit and a switch is made to the emergency function of the internal combustion engine (speed limitation 1500 rpm).
In level 2 of the power electronics control unit, an additional check is carried out to determine whether the drive torque requested by the drive train control unit is always greater than the motor torque of the electric machine calculated from the currents and the position angle of the rotor. If this is the case, the electrical machine is switched to passive by the power electronics control unit.
Hardware-implemented monitoring function of the control unit monitoring
The second monitoring level (level 3) is based on self-sufficient hardware monitoring. It consists of one
Monitoring computer that checks the basic functions of the first monitoring level in the drive train control unit (check of the checker).
Interlock circle
The interlock protects against accidental contact with live parts of the high-voltage components. An interlock voltage signal is looped through all components of the high-voltage electrical system that can be dismantled or opened (interlock circuit). For this purpose, there is an electrical bridge in each removable high-voltage connection, which interrupts the interlock circuit when the high-voltage connection is removed.
In addition, the interlock circuit is connected in series via the 12 V control unit plug-in connections of the high-voltage components. When a control unit plug connection is removed, the interlock circuit is interrupted via the interlock contacts.
During the journey, an interruption in the interlock circuit does not lead to the high-voltage electrical system being switched off. The high-voltage on-board electrical system is only switched off when the selector lever position "N" or "P" is inserted and the vehicle speed is 5 km / h. In addition, the high-voltage on-board electrical system is switched to selector lever position "D" also switched off when the bonnet is opened. If the ignition is switched off and the interlock circuit is interrupted, the vehicle is no longer ready to drive.
Decentralized interlock
The interlock protects against accidental contact with live parts of the high-voltage components. Every high-voltage component that has a removable high-voltage connection monitors this connection itself (decentralized interlock). This is done with the help of an interlock voltage signal that is looped through all of its own high-voltage connections. There is an electrical bridge in these, which interrupts the voltage signal when the high-voltage connection is disconnected. An evaluation in the high-voltage component recognizes the opening of a high-voltage connection and sends an interlock message via the network to the drive train control unit.
During the journey, an interlock message does not lead to the high-voltage electrical system being switched off. The high-voltage on-board electrical system is only switched off when the selector lever position "N" or "P" > 3s is engaged and the vehicle speed & lt; 5 km / h is. In addition, the high-voltage on-board electrical system is switched to selector lever position "D" also switched off when the bonnet is opened. If the ignition is switched off and an interlock message is active, the vehicle is no longer ready to drive.
In the pyro fuse, a clamp 30c is generated from clamp 30t. This serves the battery management system control unit and the power electronics control unit as a signal line for detecting a crash event and for the protection as well power supply. If the Supplemental Restraint System control unit trips the explosive fuse in the pyro fuse or the high-voltage disconnection device is opened, the terminal 30c signal line is interrupted and the contactor in the high-voltage battery interrupts the connection between the high-voltage battery and the high-voltage on-board network.
| Detailed information | |||
| Interlock circle detailed information | Model 177, 247 with Code ME08 (Hybrid-drive 75-84 KW-VARIANT (INCLUDING PLUGIN)) |
GF47.70-P-1100A | |
| Model 213 from 2021 with Code ME05 (Hybrid-drive 85 kW-94 kW-Variant (incl. Plug-in)) Model 213 from 2021 with Code ME08 (Hybrid-drive 75-84 KW-VARIANT (INCLUDING PLUGIN)) |
GF47.70-P-1100B | ||
| Model 223 with engine 256 with Code ME10 (Hybrid vehicle) | GF47.70-P-1100D | ||
| Model 167 with Code ME05 (Hybrid drive 85 kW-94 kW-Variant (incl. Plug-in)) | GF47.70-P-1100F | ||
| Control units | |||
| Power electronics control unit basic function | GF08.20-P-9891A | ||
| Drivetrain control unit basic function | GF54.21-P-9894A |