KR100681063B1 - Warning device for breakage of turbocharger - Google Patents

Abstract

A device for warning damage of a turbo-charger is provided to allow a worker to check damage of the turbo-charger by storing a turbo-charger damage code in a memory. A device for warning damage of a turbo-charger comprises an engine start judging unit(10), a sudden acceleration judging unit(20), a frequency judging unit(30), a warning lamp unit(40), and an error code storing unit(50). The engine start judging unit judges whether an engine RPM is bigger than the engine RPM which permits cranking and smaller than an idle engine RPM by using the signal input from an engine RPM sensor. The sudden acceleration judging unit judges whether a fuel injection amount is higher than a predetermined amount at the state where the vehicle speed is low, by using the signal input from a vehicle speed sensor and fuel injection amount information. The frequency judging unit judges whether the frequency of sudden start or sudden acceleration after start of the engine is bigger than a predetermined frequency. The warning lamp unit gives warning to a driver if the frequency of sudden start or sudden acceleration is bigger than the predetermined frequency. The error code storing unit stores error codes if the frequency of sudden start or sudden acceleration is bigger than the predetermined frequency.

Description

Warning device for breakage of turbocharger}

1 is a block diagram of a general turbocharger.

2 is a circuit diagram of a turbocharger burnout warning device according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: engine start state determination unit 20: rapid acceleration state determination unit

30: frequency judgment 40: warning light

50: fault code storage unit

The present invention relates to the field of turbochargers, and more specifically, to warn the driver that the turbocharger may be burned out if the driver starts with the accelerator pedal fully pressed at initial startup or if the driver accelerates immediately after starting. The present invention relates to a turbocharger burnout warning device, which allows a maintenance worker to check whether a turbocharger is burned out by storing a turbocharger burnout fault code in a memory.

A turbocharger is powered by the power lost from the engine, that is, the exhaust gas lost from the engine. A turbocharger is generally composed of a coaxial turbine, a compressor, a center housing and a Westgate control actuator. The turbine and the compressor are composed of a wheel and a housing, and the wheels are installed at both ends of the shaft.

Today turbochargers are widely used in industrial engines and truck commercial vehicles. In particular, a vehicle equipped with a common rail diesel engine is basically equipped with a turbocharger capable of improving performance and reducing exhaust gas by increasing the amount of intake air using the force of exhaust gas. The common rail diesel engine is controlled by the ECU to optimize the injection timing, injection pressure, and injection amount, and then improve fuel efficiency by injecting high-pressure fuel stored in the common rail, and dramatically reducing the noise, vibration and exhaust gas of the engine. It is a new diesel engine reduced by.

As illustrated in FIG. 1, the turbocharger has a structure in which engine oil is injected through an engine oil inlet 3 for lubrication between a shaft 1 and a bearing 2 having a high rotation of 150,000 RPM or more. Is made of.

When starting the engine after leaving the vehicle for at least one day after starting the vehicle, it is usually several seconds (up to 8 seconds) until the engine oil of the oil pan located at the bottom of the engine block is supplied to the lubricator of the turbocharger by the oil pump. ), Which is proportional to the time the vehicle is left unattended.

Accordingly, in the conventional turbocharger, the lubrication engine oil is applied to the shaft 1 when the driver starts the engine by fully stepping on the accelerator pedal at initial startup, or accelerates immediately after starting the engine at a high rotation of 4000 RPM or more. The turbocharger is rotated high before the lubrication portion of the bearing 2 and the bearing 2 is reached, thereby causing a critical risk of turbocharger durability such as wear of the bearing 2.

An object of the present invention is to solve the conventional problems as described above, the turbocharger may be damaged when the driver starts by fully stepping on the accelerator pedal at the initial start, or if the driver accelerates immediately after starting the engine. It is to provide a turbocharger burnout warning device to warn the driver of an accident.

Another object of the present invention is to store a turbocharger damageable fault code in the memory when the driver starts the engine by fully stepping on the accelerator pedal at the initial start-up or if the driver accelerates immediately after starting the engine. It is to provide a turbocharger burnout warning device that can check whether or not.

As a means for achieving the above object, the configuration of the present invention, using the signal input from the engine speed sensor, whether the engine speed is greater than the engine speed capable of cranking and less than the idle engine speed, that is, the engine is in a starting state A rapid acceleration state that determines whether the amount of injected fuel is above a predetermined value, i.e., a sudden acceleration state, at a low speed state of the vehicle using an engine starting state judging unit for judging whether the vehicle is in A judgment unit, a frequency judging unit for judging whether the rapid start or rapid acceleration state occurs more than a predetermined number of times immediately after starting, a warning light for warning the driver when the rapid start or rapid acceleration state occurs more than a certain number of times immediately after starting the engine Fault code storage that stores the fault code when immediate start or rapid acceleration occurs more than a certain number of times Including ledger.

The engine starting state determining unit may further include a first comparator for comparing the input engine speed signal with a reference engine speed, a timer operated by the output of the first comparator, and a time value of the timer. And a second comparator for comparing with a reference time.

The rapid acceleration state determining unit may further include a third comparator for comparing the input vehicle speed signal with the reference vehicle speed, a fourth comparator for comparing the input injection fuel amount signal with the reference injection fuel amount, and the third comparator and the fourth And a first AND product for ANDing the output of the comparator.

In addition, the frequency judging unit is operated by a second logical multiplication device for performing an AND operation on the output of the engine startup state judging unit and the rapid acceleration state judging unit, and the output of the second logical multiplication device. And a fifth comparator for comparing the counter value of the counter with the reference number of times.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram of a turbocharger burnout warning device according to an embodiment of the present invention.

As illustrated in FIG. 2, the configuration of the turbocharger burnout warning device according to an embodiment of the present invention is based on a signal input from an engine speed sensor (not shown). The vehicle is driven at a low speed by using the engine starting state determination unit 10 that determines whether the engine is larger than the idle engine speed or smaller than the idle engine speed, and a signal and injection fuel amount information input from a vehicle speed sensor (not shown). In the state of the injection fuel amount is a predetermined value or more, that is, the rapid acceleration state determination unit 20 for determining whether the rapid acceleration state, and the frequency determination unit 30 for determining whether the rapid start or sudden acceleration state occurs more than a certain number of times immediately after starting And, the warning lamp unit 40 for warning the driver when the rapid start or rapid acceleration state occurs immediately after the start-up and the rapid start or rapid acceleration state immediately after starting the work If the number of times no longer occurs comprises the trouble code storage unit 50 for storing the fault code.

The engine start state determining unit 10 includes a first comparator 11 for comparing the input engine speed signal with a reference engine speed, and a timer operated by the output of the first comparator 11 ( 12) and a second comparator 13 for comparing the time value of the timer 12 with a reference time.

The rapid acceleration state determining unit 20 includes a third comparator 21 for comparing the input vehicle speed signal with a reference vehicle speed, a fourth comparator 22 for comparing the input injection fuel amount signal with a reference injection fuel amount, And a first AND product 23 for ANDing and outputting the outputs of the third and fourth comparators 21 and 22.

The frequency judging unit 30 includes a second logical multiplication element 31 for performing an AND operation on the output of the engine start state judging unit 10 and the rapid acceleration state judging unit 20, and A counter 32 operated by the output of one second AND product 31, and a fifth comparator 33 for comparing the counter value of the counter with a reference number of times.

By the above configuration, the operation of the turbocharger burnout warning device according to an embodiment of the present invention is as follows.

When the driver starts, the crankshaft of the engine rotates. Accordingly, the engine speed sensor (not shown) detects the engine speed and converts it into an electrical signal. Will print.

The signal relating to the engine speed is input to the first comparator 11 of the engine starting state determining unit 10 and compared with the first comparator 11 to determine whether the signal is greater than the reference engine speed. The reference engine speed is an engine speed that can be cranked, and is set within a range smaller than the idle engine speed, that is, within a range capable of determining whether the engine is in a starting state. 600 rpm is set as the rotation speed.

When the engine speed is greater than the reference engine speed, the output of the first comparator 11 causes the timer 12 to operate. When the timer 12 operates as described above, the output of the timer 12 is input to the second comparator 13 and compared with the second comparator 13 to see if it is smaller than the reference time. The reference time is set within a range in which it can be determined that the initial startup state. In the embodiment of the present invention, 8 seconds is set as the reference time.

If the engine speed becomes smaller than the reference engine speed while the timer 12 is in operation, that is, if the engine is turned off, the timer 12 stops and resets to zero, thereby causing a logical low from the second comparator 13. The status is output. The logical low state is output from the second comparator 13 even when the time value of the timer 12 is larger than the reference time. However, while the engine speed is greater than the reference engine speed, the logical high state is output from the second comparator 13 while the time value of the timer 12 is smaller than the reference time.

On the other hand, after the start is made, the vehicle speed sensor (not shown) detects the speed of the vehicle, converts it into an electrical signal, and outputs it to the rapid acceleration state determining unit 20. In addition, information on the amount of injection fuel is also input to the rapid acceleration state determination unit 20.

The signal relating to the vehicle speed is input to the third comparator 21 of the rapid acceleration state determining unit 20 and compared with the third comparator 21 to determine whether it is smaller than the reference speed. The reference speed is set within a range capable of determining whether the vehicle is starting or slowing. In an embodiment of the present invention, 10 kph is set as the reference speed.

Then, the information on the injection fuel amount is input to the fourth comparator 22 of the rapid acceleration state determination unit 20 is compared with the amount of the reference injection fuel in the fourth comparator 22. The reference injection fuel amount is set within a range in which it is possible to determine whether rapid start or rapid acceleration has been made. In the embodiment of the present invention, 40 mcc is set as the reference injection fuel amount.

If the injection speed is larger than the reference injection fuel amount in a state where the vehicle speed is smaller than the reference speed, that is, if a rapid start or rapid acceleration is made at the start or low speed state, a logical high state is output from the first logical multiplication element 23.

When the logical high state is input from the engine start state determining unit 10 and the rapid acceleration state determining unit 20, that is, the engine is started for a reference time and the rapid start or rapid acceleration is performed while the vehicle speed is low. If so, the second AND product 31 of the frequency judging unit 30 operates the counter 32 by outputting a logical high state.

The output of the counter 32 of the frequency determining unit 30 is input to the fifth comparator 33 and compared with the fifth comparator 33 to determine whether it is larger than the reference number. The reference number of times is set within the range in which sudden start or rapid acceleration immediately after starting can cause burnout in the turret charger. In the embodiment of the present invention, the reference number is set five times.

If, immediately after starting, a recovery is generated in which rapid start or rapid acceleration may cause burnout in the porter charger, a logical high state is output from the fifth comparator 33.

As such, when the logical high state is output from the fifth comparator 33 of the frequency determining unit 30, the warning lamp unit 40 operates to warn the driver.

In addition, the fault code is stored in the fault code storage unit 50 so that the maintenance worker can check whether the turbocharger is burned out.

Up to now, the embodiments disclosed herein are only selected and presented the most preferred embodiment in order to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment Rather, various changes, additions, and changes are possible within the scope without departing from the spirit of the present invention, as well as other equivalent embodiments.

As described in the above embodiment, the present invention warns the driver that the turbocharger may be burned out when the driver starts the vehicle by stepping on the accelerator pedal at the initial start-up or accelerates immediately after the start-up. By storing the turbocharger burnout fault code in the memory, the maintenance worker can later check whether the turbocharger burns out.

Claims (4)

An engine starting state determining unit determining whether the engine speed is greater than the engine speed capable of cranking and less than the idle engine speed, that is, whether the engine is in a starting state by using a signal input from the engine speed sensor; A rapid acceleration state determination unit which determines whether the amount of injected fuel is a predetermined value or a rapid acceleration state in a state where the vehicle is at a low speed by using a signal inputted from the vehicle speed sensor and the information of the injected fuel amount; A frequency judging unit for determining whether a rapid start or rapid acceleration state occurs more than a predetermined number of times immediately after starting; A warning light unit to warn the driver when a rapid start or a rapid acceleration state occurs more than a predetermined number of times immediately after starting; And Turbocharger burnout warning device characterized in that it comprises a fault code storage unit for storing a fault code when a sudden start or a rapid acceleration state occurs more than a certain number of times immediately after starting. The method of claim 1, wherein the engine start state determining unit, A first comparator for comparing the input engine speed signal with a reference engine speed; A timer operated by the output of the first comparator; And And a second comparator for comparing the time value of the timer with a reference time. The method of claim 1, wherein the rapid acceleration state determination unit, A third comparator for comparing the input vehicle speed signal with a reference vehicle speed; A fourth comparator for comparing the input injection fuel amount signal with a reference injection fuel amount; And And a first logical AND element for performing an AND operation on the outputs of the third and fourth comparators. The method of claim 1, wherein the frequency determining unit, A second logical AND element for performing an AND operation on the output of the engine startup state determination unit and the rapid acceleration state determination unit; A counter operated by the output of said second AND product; And And a fifth comparator for comparing the counter value of the counter with a reference number of times.

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