BMW 3: Introduction
In the G20 PHEV, the B46B20O1 is an element of the BMW hybrid drive. The 4-cylinder engine, which generates power of 135 kW (180 hp) and a maximum torque of 300 Nm, guarantees more sustainability and efficiency.
Modified B46 engine
For use in the G20 PHEV, the B46 engine and its periphery have been modified.
Details of the individual modifications are provided in the following:
Belt drive
For deployment in the G20 PHEV, the belt drive has been modified compared to the B46TU engine in a conventional vehicle. The elimination of the alternator and mechanical air conditioning compressor enabled a reduction in the width of the belt from 6 ribs to 3 ribs.
The vibration damper has also been adapted to the modified belt drive. A viscous vibration damper with rigid belt pulley is deployed.
G20 PHEV belt drive B46B20O1
- Viscous vibration damper with rigid belt pulley
- Coolant pump belt pulley
- Tensioning pulley
- Elastic belt
The belt is tensioned via an eccentric tensioning pulley mounted on the component carrier. The dust- protected tensioning device is located under a cover on the tensioning pulley.
A belt that is not tensioned in line with accepted technical principles can lead to loss of function of the driven component or to damage. The notes and instructions in the current repair instructions therefore apply.
Vacuum system
Various components of the G20 PHEV are shown with a vacuum supply. The B46 engine generates the required vacuum using a mechanical vacuum pump. As the vacuum supply must also be guaranteed in phases in which the B46 engine is not active, the vacuum system has been enhanced with an electrical vacuum pump. As soon as the value in the vacuum system drops below a certain threshold, the electrical vacuum pump is activated. The vacuum is measured by a pressure sensor in the brake servo, which is already known from vehicles with an automatic engine start-stop function.
The following graphic provides an overview of the respective components:
G20 PHEV vacuum system
- Electrical vacuum pump
- Vacuum line to electrical vacuum pump
- Mechanical vacuum pump
- Pressure sensor
- Brake servo
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Fuel supply
For the operation of the combustion engine, the G20 PHEV is equipped with a
pressurized fuel
tank. As a result during purely electric driving it is guaranteed that the
gasoline fumes remain in
Components and their installation location
G20 PHEV components of the fuel supply in European version
Carbon canister
Pressurized fuel tank (in cast aluminum housing)
Fuel filler flap with cover
Fuel tank isolation valve
Cable for
System wiring diagram
G20 PHEV, system wiring diagram for fuel supply
Integrated supply module
Digital Motor Electronics (DME)
Shutoff valve purge air line (only for US version)
Body Domain Controller (BDC)
Fue
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STANDARD
With a sufficient state of charge of the high-voltage battery unit,
all-electric driving of the vehicle with
maximum power of the electric drive is possible for up to 41 miles (66 km). The
maximum speed in this
case is 87 mph (140 km/h).
In the STANDARD variant, all ECO PRO setting
Connection for potential compensation lines
The isolation monitoring determines whether the isolation resistance between
active high-voltage
components (e.g. high-voltage cables) and ground is above or below a required
minimum value. If
the isolation resistance falls below the minimum value, the danger exists that
the vehicle parts will be
