Brief description
| Brief description |
The PSG 16 engine management system with diesel pump VP44 is a fuel management system for diesel engines with the primary task of supplying the correct amount of diesel fuel to the combustion chamber at the right time.
When the driver presses the accelerator pedal, a wire is stretched and affects a pedal position sensor. The pedal position sensor is read by the engine control module, which then becomes aware of the magnitude of the power output desired by the driver. The amount of fuel injected controls the power output of the engine and it is up to the control module to convert the desired power output from the driver or cruise control into the amount of fuel injected per combustion.
The control module calculates the optimum injection amount per combustion for all driving conditions based on emissions, engine strength, driveability and fuel consumption.
The PSG 16 diesel injection system with diesel pump VP44 is manufactured by Robert Bosch GmbH.
PSG 16 with diesel pump VP44 has the following advantages over previous diesel injection systems:
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It is possible to control the injected amount of fuel individually for each cylinder.
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The system compensates for mechanical wear in the drive between the diesel pump and the crankshaft. Consequently, the correct moment for pressure build-up in the diesel pump is ensured during the whole service life of the engine.
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Load compensation is possible throughout the whole load and speed range.
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Efficient torque limitation as necessary.
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Cruise control is easy to integrate.
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| Control module and diesel pump, PSG 16 (595) |
The engine control module is attached to the diesel pump. The control module reads the driver's desire for power output (torque request) using a number of sensors. The control module calculates the permissible amount of fuel in mg/combustion and together with the fuel pump's electro-hydraulics regulates the injected amount of fuel per combustion and the starting time for pressure build-up in the high-pressure pump.
The pump contains a feed pump that sucks fuel from the tank through a fuel filter up to the high-pressure part of the fuel pump.
The control module has internal diagnostics, the results of which can be read directly with the diagnostic tool.
It reads the digital information from the cruise control switch and, if requested by the driver, controls the speed of the car.
| Accelerator pedal position sensor (379) |
The position sensor has two potentiometers that inform the PSG 16 control module of the driver's request for torque output.
| Coolant temperature sensor, engine management system (202) |
The temperature sensor informs the engine control module of the temperature of the engine. This information is used amongst other things to supply the engine with extra fuel during cold starting. It can also protect the engine against harmful overheating, as the control module limits the fuel quantity when there is risk of overheating.
| Engine oil temperature sensor (559) |
The temperature sensor informs the engine control module of the temperature of the engine oil. This information can also be used to carry out a plausibility diagnosis on the engine coolant temperature sensor. It can also protect the engine against harmful overheating, as the control module limits the fuel quantity when there is risk of overheating.
| Mass air flow sensor (205) |
The mass air flow sensor sends a voltage modulated signal on mass air flow to the engine control module. The control module calculates intake air mass per combustion from mass air flow.
| Temperature and pressure sensor, intake air (407/603) |
The combined pressure and temperature sensor measures the temperature and pressure of the intake air. The sensor informs the control module of the pressure in the intake manifold to control the boost pressure of the turbocharger. The sensor informs the control module of the intake air temperature so that the control module can determine the correct air mass for combustion (warm air requires a high volume).
| Crankshaft position sensor (408) |
The position sensor sends a crankshaft speed-dependent alternating current to the control module. Each pulse is used to determine when the engine has reached top dead centre.
| Control module, glow plugs (596) |
The control module supplies power to the glow plugs on request from the engine control module. It also reduces the power to the glow plugs when the engine has started. The glow plug control module has internal diagnostics, the result of which is sent through a lead to the engine control module where any DTCs can be read.
| Switch, cruise control (141) |
The driver can request that the engine control module retain the set vehicle speed or, alternatively, reduce or increase the set vehicle speed.
| Clutch switch, cruise control (133) |
The switch informs the engine control module of the position of the clutch pedal. It is used to turn off the cruise control.
| Brake switch, cruise control (134) |
The switch is used to perform a plausibility diagnosis of the brake light switch. It is used to turn off the cruise control.
| Brake light switch (29) |
The switch informs the engine control module of the position of the brake pedal. It is used to turn off the cruise control.
| Main relay, engine management system (229) |
The relay controls the power supply to the diesel control system.
| Relay, A/C compressor (156) |
The relay turns the A/C compressor on and off after receiving a command from the engine control module.
| Charge air control valve (179a) |
The control valve controls boost pressure using a vacuum from the vacuum pump.
| Control valve, swirl throttle (403) |
The control valve controls the swirl throttle using a vacuum from the vacuum pump.
| EGR valve (606) |
The EGR valve is a control valve with its own control module. The EGR function means that the engine control module gives the order that the EGR is to allow in a certain amount of combusted gases to reach the mg/combustion calculated by the control module. The EGR valve with processor has internal diagnostics.
| P-bus and I-bus |
Information on the I-bus comes to PSG 16 partly on the P-bus via MIU.
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