| Motormanagement |
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| This article is a summary of the full version from Born Classic |
| The Engine This article describes the motor management system of the Volvo 480. First, a brief general introduction on motor management is presented. The Volvo 480 motor management system is controlled by a sophisticated electronic control unit (ECU), which is described later on. The different versions of the ECU, including original Volvo part numbers and bodynumbers, are presented in a table All versions of the Volvo 480 have a four cylinder multipoint injection engine. Multipoint indicates that every cylinder has its own fuel injector. Advantage of multipoint injection over a single point injection is that the fuel/air mix is better controlled, resulting in smoother running, improved efficiency and less pollution.The following factors are key to high efficiency: quality of the fuel, the fuel/air mix, compression ratio, shape of the combustion chambers, timing of fuel injection, ignition timing and the valve timing (opening, closing and lift of the inlet and outlet valves). The motor management system adresses the fuel injection and ignition. |
| Management By system, the fact that the engine is controlled by several interrelated components is indicated. The management system of the Volvo 480 is controlled by an electronic control unit (ECU). This unit is a computer on its own, receiving data froms several sensors, and controlling injectors and ignition. During its years of production, different ECU's were used, a.o. varying per engine type. The ECU is located in the car's interior, on the body panel at the right side under the dashboard, near the right knee of the passenger (passenger in continental version). The ECU receives data on air pressure (sensor under the bonnet), lambasond (oxigensensor in catalyst), flywheel sensor (measuring rotations per minute and cranckshaft position), carbonoxide emission, inlet air temperature, cooling liquid temperature, fuel valve opening, knock sensor. The ECU sends signals to the injectors, the valve controlling idling and the ignition unit. These output signals are based on preset variables. Presets are factory determined for each combination of measurements of input data. Optimal programming for high torque, high fuel economy, low emission, reliability etcetera is based on real life test data. The programmed data are embedded in the integrated circuits on the ECU. |
| Versions During its years of production, several versions of the ECU were used. In total, 14 different part numbers are used to identify these versions. Generally speaking, each ECU version is linked to the engine type and the body number. The tables below show the various part, engine and body numbers. Although these tables are based on original Volvo information and prepared with utmost care, they are tentative. The Dutch Volvo 480 Enthusiasts Club does not assume any responsibility, also because there are still some unclarities.Unclarities include the first body number of 1986, the first and last body number of 1995, the actual dates of transition to different engine types (especially from B18E to B18F engine and from B18EP/FP engine to B20F engine), the overlap between the different engine types (were different engine types mounted succeedingly, or did they overlap each other), and the fuel engine code of the B20F engine. |
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