Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine
Patent
1997-11-21
1998-12-08
Koczo, Michael
Power plants
Fluid motor means driven by waste heat or by exhaust energy...
With supercharging means for engine
F02B 37007
Patent
active
058454950
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arrangement for detecting speed-of-rotation deviations between two exhaust-gas turbochargers of an internal combustion comprised of two separate cylinder banks, an exhaust train with an exhaust turbine being allocated to each cylinder bank.
BACKGROUND INFORMATION
The international Patent Application No. WO 90/03503 discloses a V-engine, which is comprised of two cylinder banks and has one exhaust-gas turbocharger for each cylinder bank. Provision is made for a boost pressure closed-loop control, which is supposed to assure that the same pressures prevail in the induction pipes of both cylinder blocks. To ensure equal pressures in both induction pipes, the speeds of rotation of the exhaust turbines arranged in the exhaust trains of the two cylinder blocks are automatically controlled as a function of the pressures measured in both induction pipes. The rotational speeds of the exhaust turbines are controlled in closed loop using bypass valves.
If a fault occurs in one of the two exhaust trains, e.g., a clogged catalytic converter, a defect in the boost-pressure controller or a malfunction of the exhaust turbine, etc., then the defect becomes noticeable because of the difference in the rotational speeds of the two exhaust-gas turbochargers. Thus, a speed deviation between the two exhaust-gas turbochargers indicates some defect, which could cause damage to one of the two exhaust-gas turbochargers.
To detect defects in a timely fashion and to avoid expensive damages resulting from the defects, there is a need to specify an arrangement for detecting the speed deviations between the two exhaust-gas turbochargers of an internal combustion engine includes two separate cylinder banks.
SUMMARY OF THE INVENTION
The device according to the present invention determines the difference between the pressures or gas masses (or volumes) prevailing in the two exhaust trains upstream from the exhaust turbines. A speed deviation between the exhaust-gas turbochargers is signaled when the difference sensed exceeds a specifiable threshold. The pressure ratios or gas masses or gas-volume ratios in the exhaust trains of the two cylinder banks give reliable evidence of whether a relevant speed deviation exists between the two exhaust-gas turbochargers.
The threshold for the measured pressure difference or the difference in the gas masses (or volumes) can be a function of the air mass (or volume) in the induction pipe or of the engine speed and/or of the load of the engine.
When a speed deviation has been recognized, various measures can be introduced to avoid greater damages on the exhaust-gas turbochargers. Either the closed-loop control system for the exhaust-gas turbochargers is interrupted and, in its place, a manipulated variable is made available, or a cylinder-selective suppression of injection is induced, or the maximum opening of the throttle valve is limited.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a block diagram of an internal combustion engine having two exhaust-gas turbochargers according to the present invention.
FIG. 2 shows a block diagram of an engine having two exhaust-gas turbochargers, where the gas masses (or volumes) in the two exhaust trains are measured to detect speed deviations.
DETAILED DESCRIPTION OF THE DRAWINGS
FIG. 1 schematically shows a V-engine a boxer engine, a flat engine, or a horizontally opposed engine (1), includes two cylinder banks (2,3). Each cylinder bank (2,3) has its own exhaust train (4,5). Installed in each the exhaust train (4,5) is an exhaust turbine (6,7) of an exhaust-gas turbocharger. Exhaust turbine (6) in exhaust train (4) drives a supercharger (8), and exhaust turbine (7) in exhaust train (5) drives a supercharger (9). The two superchargers (8,9) compress the intake air in induction pipe (10), which in the shown exemplary embodiment is comprised of a pipe in which is arranged an intercooler (11) and a throttle valve (12). Downstream of throttle valve (12), induction pipe (10) branches into two cylind
REFERENCES:
patent: 2199259 (1940-04-01), Hersey
patent: 2359615 (1944-10-01), Browne et al.
patent: 5090204 (1992-02-01), Bonitz et al.
Bauerle Michael
Haming Werner
Schray Bernhard
Koczo Michael
Robert & Bosch GmbH
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