JP4715815B2 - Drive source control device, control method, program for realizing the method, and recording medium recording the program - Google Patents

Description

  The present invention relates to a drive source control device, a control method, a program for realizing the method, and a recording medium on which the program is recorded, and more particularly to a technique for limiting the output of the drive source when an abnormality is detected.

  2. Description of the Related Art Conventionally, a technique for limiting the output of a drive source is known in order to prevent the occurrence of a secondary failure when an abnormality occurs in a drive source such as an engine. The output of the drive source is limited so that, for example, the vehicle can travel and no secondary failure occurs.

  Japanese Patent Laid-Open No. 2001-317399 (Patent Document 1) discloses an instruction unit that outputs an instruction signal that transmits a request to increase a driving force output from a vehicle axle, and a power that is mounted on the vehicle and generates the driving force of the vehicle. A control unit that controls the generator so that the driving force changes according to an instruction signal from the instruction unit, an abnormality detection unit that detects a specific type of abnormality in the vehicle, and when an abnormality is detected An operation control device comprising: a control change unit that changes control executed by the control unit to abnormality detection time control corresponding to a detected abnormality type among a plurality of preset abnormality detection time control To do. At least one of a plurality of preset abnormality detection controls is based on at least one of the conditions of the elapsed time since the abnormality was detected and the travel distance since the abnormality was detected. It is the control which restricts the driving force of stepwise.

According to the operation control device described in Patent Literature 1, when a specific type of abnormality is detected in the vehicle, an abnormality detection corresponding to the detected abnormality type among a plurality of preset abnormality detection controls. Time control is executed. Therefore, even when an abnormality occurs, the driving force of the vehicle can be ensured according to the type of abnormality that has occurred. Therefore, when an abnormality that has little influence on the generation of the driving force by the power generation device occurs, it is possible to prevent the driver from feeling a decrease in operability by not limiting the driving force of the vehicle more than necessary. In addition, by securing the driving force at the time of occurrence of an abnormality according to the type of abnormality, it is possible to improve safety when taking a retreat action at the time of occurrence of the abnormality.
JP 2001-317399 A

  However, the operation control device described in Japanese Patent Application Laid-Open No. 2001-317399 merely restricts the output according to the type of abnormality or limits the output in stages. For this reason, there is room for further improvement in order to finely control the output at the time of occurrence of an abnormality to improve the behavior and drivability of the vehicle.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a drive source capable of finely controlling the output when an abnormality occurs to improve the behavior and drivability of the vehicle. A control device, a control method, a program for realizing the method, and a recording medium on which the program is recorded.

  According to a first aspect of the present invention, there is provided a control device for a drive source, a command for detecting an abnormality of a drive source mounted on a vehicle, and a command relating to an output of the drive source according to an operation amount of an operation unit operated by a driver. Command value setting means for setting the command value so that the value is less than or equal to the upper limit if an abnormality is detected, and the rate of decrease in the upper limit is abnormal if a drive source abnormality is detected The reduction rate setting means for setting according to the type of the power supply, the upper limit setting means for setting the upper limit value so that the upper limit value decreases at the set reduction rate, and the output of the drive source according to the command value Means for controlling. The drive source control method according to the sixth aspect of the present invention has the same requirements as the drive source control apparatus according to the first aspect of the present invention.

  According to the first or sixth invention, the command value related to the output of the drive source is set according to the operation amount of the operation unit operated by the driver. This command value is set to be equal to or lower than the upper limit value when an abnormality is detected. When an abnormality of the drive source is detected, the reduction rate of the upper limit value is set according to the type of abnormality. The upper limit value is set so that the upper limit value decreases at the set decrease rate. The output of the drive source is controlled according to the command value that is limited to the upper limit value or less. As a result, when an abnormality of the drive source is detected, the output of the drive source can be limited so as to decrease at a reduction rate corresponding to the type of abnormality. Therefore, for example, by reducing or increasing the reduction rate according to the type of abnormality, it is possible to finely control the output when an abnormality occurs. As a result, it is possible to provide a drive source control device or control method that can improve the behavior and drivability of the vehicle.

  In the drive source control apparatus according to the second aspect of the invention, in addition to the configuration of the first aspect, the reduction rate setting means sets the first reduction rate to the upper limit value when the first type of abnormality is detected. When a second type of abnormality different from the first type is detected and a means for setting the reduction rate, a second reduction rate different from the first reduction rate is set as the upper limit reduction rate. Means. The upper limit setting means includes a means for setting an upper limit value so as to decrease at a first decrease rate to a first limit value when a first type abnormality is detected, and a second type abnormality. Means for setting an upper limit value so as to decrease at a second rate of decrease to a second limit value different from the first limit value if detected. The drive source control method according to the seventh invention has the same requirements as those of the drive source control device according to the second invention.

  According to the second or seventh invention, when the first type of abnormality is detected, the upper limit value is set so as to decrease at the first decrease rate up to the first limit value. When the second type of abnormality is detected, the upper limit value is set so as to decrease at the second reduction rate up to the second limit value. As a result, the output of the drive source can be controlled so that the output corresponding to the type of abnormality decreases at a reduction rate corresponding to the type of abnormality. Therefore, the output of the drive source can be controlled more finely.

  In the drive source control apparatus according to the third aspect of the invention, in addition to the configuration of the second aspect of the invention, the first reduction rate is smaller than the second reduction rate. The first limit value is larger than the second limit value. The drive source control method according to the eighth invention has the same requirements as the drive source control device according to the third invention.

  According to the third or eighth aspect of the invention, when the first type of abnormality is detected, the upper limit of the command value is set so as to decrease at a smaller decrease rate than when the second type of abnormality is detected. Value is set. Further, when the first type of abnormality is detected, the command value is finally set to a larger value than when the second type of abnormality is detected. Thereby, for example, when the degree of abnormality is small, the output limit amount can be made smaller than when the degree of abnormality is large. Therefore, it is possible to prevent the output from being restricted more than necessary. As a result, it is possible to reduce a sense of discomfort that can be given to the driver when an abnormality occurs in the drive source.

  According to a fourth aspect of the present invention, there is provided a control device for a drive source, a command for detecting an abnormality of the drive source mounted on the vehicle, and a command relating to the output of the drive source in accordance with an operation amount of the operation unit operated by the driver. Command value setting means for setting the command value to be less than the upper limit value when an abnormality is detected, and up to a predetermined limit value when a drive source abnormality is detected Means for setting an upper limit value so as to decrease at a predetermined reduction rate, and whether or not the limit value is set to the upper limit value when the operation amount of the operation unit is smaller than the limit value. And a means for controlling the output of the drive source according to the command value. The drive source control method according to the ninth aspect has the same requirements as those of the drive source control apparatus according to the fourth aspect.

  According to the 4th or 9th invention, the command value regarding the output of a drive source is set according to the operation amount of the operation part operated by the driver | operator. This command value is set to be equal to or lower than the upper limit value when an abnormality is detected. When an abnormality of the drive source is detected, the upper limit value is set so as to decrease at a predetermined decrease rate up to a predetermined limit value. When the operation amount of the operation unit is made smaller than the limit value, whether or not to set the limit value to the upper limit value is selected according to the type of abnormality of the drive source. Thereby, when abnormality of a drive source is detected, it can be selected according to the kind of abnormality whether output limitation which considers a driver's operation is performed. Therefore, the output when an abnormality occurs can be finely controlled according to the type of abnormality. As a result, it is possible to provide a drive source control device or control method that can improve the behavior and drivability of the vehicle.

  In the drive source control device according to the fifth invention, in addition to the configuration of any one of the first to fourth inventions, the command value setting means sets the command value according to the accelerator opening, and an abnormality is detected. If so, a means for setting the command value to be equal to or less than the upper limit value is included. The drive source control method according to the tenth invention has the same requirements as the drive source control device according to the fifth invention.

  According to the fifth or tenth invention, the command value related to the output of the drive source is set according to the accelerator opening. This command value is set to be equal to or lower than the upper limit value when an abnormality is detected. Thus, even when the driver requests a high output, the output can be limited when an abnormality occurs. Therefore, it is possible to prevent a secondary failure from occurring.

  A program according to an eleventh invention is a program for causing a computer to implement the control method according to any of the sixth to tenth inventions, and the recording medium according to the twelfth invention is any one of the sixth to tenth inventions It is a computer-readable recording medium which recorded the program which makes a computer implement | achieve the control method which concerns on invention.

  According to the eleventh or twelfth invention, the drive source control method according to any of the sixth to tenth inventions can be realized using a computer (which may be general purpose or dedicated).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<First Embodiment>
An embodiment in which the control device according to the first embodiment of the present invention is applied to a diesel engine will be described. A gasoline engine or a motor may be used as a vehicle drive source instead of the diesel engine.

  In FIG. 1, an internal combustion engine (hereinafter referred to as an engine) 1000 is an in-line four-cylinder diesel engine system including a fuel supply system 100, a combustion chamber 200, an intake system 300, an exhaust system 400, and the like as main parts.

  The fuel supply system 100 includes a supply pump 110, a common rail 120, a fuel injection valve 130, a shutoff valve 140, an engine fuel passage 800, and the like.

  The supply pump 110 pumps fuel from the fuel tank, raises the pumped fuel to a high pressure, and supplies the pumped fuel to the common rail 120 via the engine fuel passage 800. The common rail 120 functions as a pressure accumulation chamber that holds (accumulates) the high-pressure fuel supplied from the supply pump 110 at a predetermined pressure, and distributes the accumulated fuel to each fuel injection valve 130. The fuel injection valve 130 includes an electromagnetic solenoid therein, and is appropriately opened to inject fuel into the combustion chamber 200.

  The intake system 300 forms a passage (intake passage) for intake air supplied into each combustion chamber 200. The exhaust system 400 is configured by connecting various passage members such as an exhaust port 410, an exhaust manifold 420, a catalyst upstream side passage 430, and a catalyst downstream side passage 440 in order from upstream to downstream, and exhaust exhausted from each combustion chamber 200. A gas passage (exhaust passage) is formed. A catalyst 450 is provided between the catalyst upstream side passage 430 and the catalyst downstream side passage 440.

  Further, the engine 1000 is provided with a known supercharger (turbocharger) 500. The turbocharger 500 includes two turbine wheels 520 and a turbine wheel 530 that are connected via a shaft 510. One turbine wheel (intake side turbine wheel) 530 is exposed to intake air in the intake system 300, and the other turbine wheel (exhaust side turbine wheel) 520 is exposed to exhaust in the exhaust system 400. The turbocharger 500 having such a configuration performs so-called supercharging in which the intake side turbine wheel 530 is rotated using the exhaust flow (exhaust pressure) received by the exhaust side turbine wheel 520 to increase the intake pressure.

  In the intake system 300, the intercooler 310 provided in the turbocharger 500 forcibly cools the intake air whose temperature has been increased by supercharging. The throttle valve 320 provided further downstream than the intercooler 310 is an electronically controlled on-off valve whose opening degree can be adjusted steplessly, and the flow area of the intake air is reduced under predetermined conditions. The function of adjusting (reducing) the supply amount of the intake air is provided.

  Further, the engine 1000 is formed with an exhaust gas recirculation passage (EGR passage) 600 that bypasses the upstream (intake system 300) and the downstream (exhaust system 400) of the combustion chamber 200. The EGR passage 600 has a function of returning a part of the exhaust to the intake system 300 as appropriate. The EGR passage 600 is opened and closed steplessly by electronic control, and an exhaust gas recirculation (EGR) valve 610 that can freely adjust the flow rate of exhaust gas flowing through the passage, and exhaust gas that passes through (recirculates) the EGR passage 600. An EGR cooler 620 for cooling is provided.

  Various sensors are attached to each part of the engine 1000, and signals related to the environmental conditions of each part and the operating state of the engine 1000 are output.

  For example, the rail pressure sensor 700 outputs a detection signal corresponding to the fuel pressure stored in the common rail 120. The air flow meter 720 outputs a detection signal corresponding to the flow rate (intake amount) Ga of intake air downstream of the throttle valve 320 in the intake system 300.

  The accelerator opening sensor 750 is attached to the accelerator pedal 752 of the engine 1000 and outputs a detection signal corresponding to the operation amount of the pedal, that is, the accelerator opening Acc. Each of these sensors is electrically connected to an electronic control unit (ECU) 1100.

  The ECU (Electronic Control Unit) 1100 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a backup RAM, a timer, a counter, and the like, and an A / D (Analog / Digital). ) An external input circuit including a converter and an external output circuit are connected by a bidirectional bus.

  The ECU 1100 configured as described above inputs detection signals from the various sensors via an external input circuit, and performs basic control for fuel injection and the like of the engine 1000 based on these signals, as well as a reducing agent (as a reducing agent). Various controls relating to the operating state of the engine 1000 are executed, such as control of addition of a reducing agent (fuel) relating to determination of addition timing and supply amount for the functioning fuel) addition.

  ECU 1100 may be divided into a plurality of ECUs. Further, the program executed by the ECU 1100 may be recorded on a recording medium such as a CD (Compact Disc) or a DVD (Digital Versatile Disc) and distributed to the market.

  With reference to FIG. 2, the function of ECU 1100 which is the control apparatus according to the present embodiment will be described. Note that the functions described below may be realized by hardware or may be realized by software.

  ECU 1100 includes an abnormality detection unit 1110, a command value setting unit 1120, a decrease rate setting unit 1130, an upper limit setting unit 1140, and an output control unit 1150.

  Abnormality detection unit 1110 detects an abnormality in engine 1000. For example, an abnormality that the turbocharger 500 has insufficient supercharging pressure, an abnormality that the EGR valve 610 does not close, an abnormality of the air flow meter 720, an abnormality that the pressure of the fuel in the common rail 120 is excessively high, or the like is detected. In addition, about the method of detecting these abnormality, what is necessary is just to use a known general technique, Therefore The detailed description is not repeated here. Moreover, the kind of abnormality is not restricted to these.

  Command value setting unit 1120 sets the command value of the accelerator opening used for controlling the output of engine 1000 according to the actual accelerator opening detected by accelerator opening sensor 750. Furthermore, when an abnormality in engine 1000 is detected, command value setting unit 1120 sets the command value to be equal to or less than the upper limit value set by upper limit setting unit 1140. That is, when an abnormality in engine 1000 is detected, a command value is set according to the actual accelerator opening within a range equal to or less than the upper limit value.

  The decrease rate setting unit 1130 sets the decrease rate of the upper limit value of the command value according to the type of abnormality. For example, when an abnormality that the turbocharger 500 has insufficient supercharging pressure, an abnormality that the EGR valve 610 does not close, or an abnormality of the air flow meter 720 is detected, the first reduction rate is set to the reduction rate of the upper limit value. More specifically, the first reduction amount is set to a reduction amount that represents the amount by which the upper limit value is periodically reduced.

  On the other hand, when an abnormality that the pressure of the fuel in the common rail 120 is excessively high is detected, a second reduction rate larger than the first reduction rate is set as the reduction amount of the upper limit value. More specifically, a second reduction amount larger than the first reduction amount is set as the upper limit reduction amount.

  The upper limit setting unit 1140 sets the upper limit value of the command value so as to decrease at a set decrease rate up to a limit value determined according to the type of abnormality. For example, when an abnormality that the turbocharger 500 supercharging pressure is insufficient, an abnormality that the EGR valve 610 does not close, or an abnormality of the air flow meter 720 is detected, the upper limit value is decreased at the first reduction rate up to the first limit value. Set to On the other hand, when an abnormality that the pressure of the fuel in the common rail 120 is excessively high is detected, the upper limit value is set to decrease at the second reduction rate to a second limit value that is smaller than the first limit value. The initial value of the upper limit value is, for example, 100%, which is the maximum value of the accelerator opening.

  The output control unit 1150 controls the output of the engine 1000 according to the set command value. For example, the output of engine 1000 is controlled by controlling the fuel injection amount from fuel injection valve 130 to be smaller as the command value is smaller.

  With reference to FIG. 3, a control structure of a program executed by ECU 1100 which is the control apparatus according to the present embodiment will be described. The program described below is repeatedly executed at a predetermined cycle.

  In step (hereinafter, step is abbreviated as S) 100, ECU 1100 determines whether or not an abnormality in engine 1000 has been detected. If an abnormality in engine 1000 is detected (YES in S100), the process proceeds to S102. If not (NO in S100), the process proceeds to S122.

  In S102, ECU 1100 determines whether or not the upper limit value of the accelerator opening command value is being decreased. For example, when the upper limit value is decreased in the previous control cycle, it is determined that the upper limit value is decreasing. If the upper limit value is being decreased (YES in S102), the process proceeds to S106. If not (NO in S102), the process proceeds to S104. In S104, ECU 110 initializes the upper limit value. For example, the maximum value of the accelerator opening is set as the upper limit value.

  In S106, ECU 1100 sets the reduction amount and limit value of the upper limit value according to the type of abnormality. In S108, ECU 1100 decreases the upper limit value by the set decrease amount.

  In S110, ECU 1100 determines whether or not the upper limit value is less than or equal to a limit value set according to the type of abnormality. If the upper limit value is less than or equal to the limit value (YES in S110), the process proceeds to S112. If not (NO in S110), the process proceeds to S114. In S112, ECU 1100 sets the limit value to the upper limit value.

  In S114, ECU 1100 determines whether or not the actual accelerator opening detected by accelerator opening sensor 750 is equal to or less than the upper limit value. If the actual accelerator opening is equal to or smaller than the upper limit value (YES in S114), the process proceeds to S116. If not (NO in S114), the process proceeds to S118.

  In S116, ECU 1100 sets the actual accelerator opening to the command value. In S118, ECU 1100 sets the upper limit value to the command value. In S120, ECU 1100 controls the output of engine 1000 according to the command value.

  In S122, ECU 1100 sets the actual accelerator opening detected by accelerator opening sensor 750 as the upper limit value of the command value. When the upper limit value is being decreased, the actual accelerator opening is set to the upper limit value, whereby the decrease of the upper limit value is stopped.

  An operation of ECU 1100 that is the control device according to the present embodiment based on the above-described structure and flowchart will be described.

  When abnormality of engine 1000 is detected (YES in S100), it is determined whether or not the upper limit value of the accelerator opening command value is decreasing (S102). Here, it is assumed that the upper limit value is not decreasing (NO in S102).

  In this case, the upper limit value of the command value for the accelerator opening is initialized (S104). The reduction amount and limit value of the upper limit value are set according to the type of abnormality (S106). The upper limit value is decreased by the set decrease amount (S108). That is, the upper limit value is set so that the upper limit value decreases at a reduction rate set according to the type of abnormality.

  If the upper limit value is less than or equal to the limit value set according to the type of abnormality (YES in S110), the limit value is set to the upper limit value (S112). If the upper limit value is larger than the limit value (NO in S110), the upper limit value is repeatedly reduced (gradually decreased) until it becomes equal to or lower than the limit value.

  As a result, as shown in FIG. 4, the upper limit value can be reduced at a reduction rate corresponding to the type of abnormality up to a limit value corresponding to the type of abnormality. For this reason, for example, when an abnormality with a low possibility of causing a secondary failure is detected, the upper limit value should be decreased more slowly than when an abnormality with a high possibility of occurrence of a secondary failure is detected. Can do.

  If the actual accelerator opening detected by accelerator opening sensor 750 is equal to or smaller than the upper limit value (YES in S114), the actual accelerator opening is set to the command value (S116). If the actual accelerator opening is larger than the upper limit value (NO in S114), the upper limit value is set as the command value (S118). The output of engine 1000 is controlled according to this command value (S120).

  As a result, for example, when an abnormality is detected that is unlikely to cause a secondary failure, the output is gradually reduced as compared to the case where an abnormality that is likely to cause a secondary failure is detected. Can do. Therefore, it is possible to prevent the output from being limited more than necessary when an abnormality with a low possibility of causing a secondary failure is detected. In addition, when an abnormality that is highly likely to cause a secondary failure is detected, the output can be quickly reduced. As a result, it is possible to finely control the output when an abnormality occurs.

  On the other hand, if abnormality of engine 1000 is not detected (NO in S100), the actual accelerator opening detected by accelerator opening sensor 750 is set to the upper limit value of the command value (S122). Thereby, the output according to the actual accelerator opening can be obtained.

  As described above, according to the ECU that is the control device according to the present embodiment, when an engine abnormality is detected, the reduction amount and the limit value of the upper limit value of the command value are set according to the type of abnormality. . Furthermore, the upper limit value is set so as to decrease at a reduction rate set according to the type of abnormality up to a limit value set according to the type of abnormality. The engine output is controlled in accordance with the accelerator opening command value set to be equal to or lower than the upper limit value. Thereby, when an abnormality of the engine is detected, the output of the engine can be limited so as to decrease at a decreasing rate corresponding to the type of abnormality. Therefore, for example, by reducing or increasing the reduction rate according to the type of abnormality, it is possible to finely control the output when an abnormality occurs. As a result, the behavior and drivability of the vehicle can be improved.

<Second Embodiment>
Hereinafter, a second embodiment of the present invention will be described. In the present embodiment, when the actual accelerator opening is made smaller than the limit value, whether or not the limit value is set to the upper limit value is selected according to the type of engine abnormality. This is different from the embodiment. Other structures are the same as those in the first embodiment. The same applies to their functions. Therefore, description of those details will not be repeated here.

  With reference to FIG. 5, the function of ECU 1100 which is the control device according to the present embodiment will be described. Note that the functions described below may be realized by hardware or may be realized by software. The same functions as those in the first embodiment are denoted by the same reference numerals. Therefore, detailed description thereof will not be repeated here.

  ECU 1100 includes a selection unit 1160 in addition to abnormality detection unit 1110, command value setting unit 1120, reduction rate setting unit 1130, upper limit setting unit 1140, and output control unit 1150.

  When the actual accelerator opening detected by accelerator opening sensor 750 is made smaller than the limit value, selection unit 1160 selects whether to set the limit value to the upper limit value according to the type of engine abnormality. To do.

  For example, when an abnormality is detected that the fuel pressure in the common rail 120 is excessively high, if the actual accelerator opening is made smaller than the second limit value, the second limit value is set to the upper limit value.

  On the other hand, for example, when an abnormality that the turbocharger 500 supercharging pressure is insufficient, an abnormality that the EGR valve 610 does not close, or an abnormality of the air flow meter 720 is detected, the actual accelerator opening is made smaller than the first limit value. However, the first limit value is not set to the upper limit value.

  With reference to FIG. 6, a control structure of a program executed by ECU 1100 which is the control apparatus according to the present embodiment will be described. The program described below is repeatedly executed at a predetermined cycle. The same step numbers are assigned to the same processes as those in the first embodiment. Therefore, detailed description thereof will not be repeated here.

  In S200, ECU 1100 determines whether or not the actual accelerator opening detected by accelerator opening sensor 750 is smaller than the limit value. If the actual accelerator opening is smaller than the limit value (YES in S200), the process proceeds to S112. If not (NO in S200), the process proceeds to S108.

  In this way, as shown in FIG. 7, the limit value can be set to the upper limit value when the accelerator opening becomes smaller than the limit value at time T (0). For this reason, for example, when an abnormality that is highly likely to cause a secondary failure is detected, the output once reduced can be prevented from increasing. Further, when an abnormality with a low possibility of causing a secondary failure is detected, the output can be prevented from being limited more than necessary.

  As described above, according to the ECU that is the control device according to the present embodiment, whether or not the limit value is set to the upper limit value when the actual accelerator opening is made smaller than the limit value is an engine abnormality. It is selected according to the type. Thereby, it can be selected according to the kind of abnormality whether the output restriction in consideration of a driver's operation is performed. Therefore, the output when an abnormality occurs can be finely controlled according to the type of abnormality. As a result, the behavior and drivability of the vehicle can be improved.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic block diagram which shows the diesel engine system controlled by ECU which is a control apparatus which concerns on the 1st Embodiment of this invention. It is a functional block diagram of ECU which is a control device concerning a 1st embodiment of the present invention. It is a flowchart which shows the control structure of the program which ECU which is a control apparatus which concerns on the 1st Embodiment of this invention performs. It is a timing chart (the 1) which shows transition of the upper limit of command value. It is a functional block diagram of ECU which is a control apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the control structure of the program which ECU which is a control apparatus which concerns on the 2nd Embodiment of this invention performs. It is a timing chart (the 2) which shows transition of the upper limit of command value.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 Fuel supply system, 110 Supply pump, 120 Common rail, 130 Fuel injection valve, 200 Combustion chamber, 300 Intake system, 310 Intercooler, 320 Throttle valve, 400 Exhaust system, 410 Exhaust port, 420 Exhaust manifold, 430 Catalyst upstream passage 440 catalyst downstream side passage, 450 catalyst, 500 turbocharger, 510 shaft, 520, 530 turbine wheel, 600 exhaust recirculation passage, 610 EGR valve, 620 EGR cooler, 700 rail pressure sensor, 720 air flow meter, 750 accelerator opening sensor 752 Accelerator pedal, 800 Engine fuel passage, 1000 Engine, 1100 ECU, 1110 Abnormality detection unit, 1120 Command value setting unit, 1130 Decrease rate setting unit, 1140 Upper limit setting unit, 11 0 output control section, 1160 selector.

Claims (6)

Means for detecting an abnormality of a drive source mounted on the vehicle;
A command value for setting a command value related to the output of the drive source in accordance with the operation amount of the operation unit operated by the driver, and setting the command value to be equal to or less than the upper limit value when an abnormality is detected Setting means;
Means for setting the upper limit value so as to decrease at a predetermined decrease rate to a predetermined limit value when an abnormality of the drive source is detected;
At least one of the abnormality that the turbocharger supercharging pressure is insufficient, the abnormality that the EGR valve does not close, and the abnormality of the air flow meter is detected, and the operation amount of the operation unit is greater than the limit value. In a case where the limit value is not set to the upper limit value, the abnormality that the fuel pressure in the common rail is high is detected and the operation amount of the operation unit is made smaller than the limit value. Means for selecting whether to set the limit value to the upper limit value according to the type of abnormality of the drive source, so as to set the limit value to the upper limit value;
Means for controlling the output of the drive source in accordance with the command value.   The command value setting means includes a means for setting the command value according to an accelerator opening, and setting the command value to be equal to or less than the upper limit value when an abnormality is detected. The drive source control device according to 1. Detecting an abnormality of a drive source mounted on the vehicle;
Setting a command value related to the output of the drive source according to the amount of operation of the operation unit operated by the driver, and setting the command value to be equal to or less than an upper limit value when an abnormality is detected;
When the abnormality of the drive source is detected, setting the upper limit value to decrease at a predetermined decrease rate to a predetermined limit value;
At least one of an abnormality that the turbocharger supercharging pressure is insufficient, an abnormality that the EGR valve does not close, and an abnormality of the air flow meter is detected, and the operation amount of the operation unit is greater than the limit value. In a case where the limit value is not set to the upper limit value, the abnormality that the fuel pressure in the common rail is high is detected and the operation amount of the operation unit is made smaller than the limit value. Selecting whether to set the limit value to the upper limit value according to the type of abnormality of the drive source, so as to set the limit value to the upper limit value;
Controlling the output of the drive source in accordance with the command value.   The step of setting the command value includes a step of setting the command value according to an accelerator opening, and setting the command value to be equal to or less than the upper limit value when an abnormality is detected. 4. A method of controlling a drive source according to 3.   The program which makes a computer implement | achieve the control method of Claim 3 or 4.   A computer-readable recording medium recording a program for causing a computer to implement the control method according to claim 3 or 4.

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