JP2526533Y2 - Vehicle engine output control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine output control device for a vehicle used for controlling driving wheels of a vehicle for suppressing excessive slippage of driving wheels of the vehicle.

Conventionally, a throttle valve of an internal combustion engine for a vehicle is conventionally operated by an accelerator pedal. However, when a driving wheel of the vehicle slips due to a road surface condition or the like, the engine output is temporarily reduced to reduce the driving wheel. To eliminate the slip quickly
As a means of reducing engine output, a traction control system (hereinafter “TC”) that uses a pulse motor to control and throttle the throttle valve independently of the accelerator pedal
A drive wheel control device called "S") is known.

According to such a TCS, when the TCS is not operated, the pulse motor stands by at the fully open position, and the actual throttle valve opening value does not match the pulse motor position. Therefore, the actual throttle valve opening value when the throttle valve is controlled to be closed by the motor during the TCS operation (pulse motor control) is used as the initial position of the pulse motor (initialize).

That is, the pulse motor that has been waiting on the throttle valve fully open side is driven to the throttle valve closing side, and the state in which the accelerator pedal opening is larger than the throttle valve opening and the pulse motor is stopped for a predetermined period of time. When the operation is continued, the throttle valve opening detected by the throttle valve opening sensor at that time is stored as a reference value (reference opening) of the pulse motor position (determination of the initial position of the pulse motor), and based on the stored reference value. The pulse motor is driven in the direction of opening or closing the throttle valve so as to approach the target opening value, and before the initialization, feedback control based on the detection value of the throttle valve opening sensor is performed, and after the initialization, A method for driving a pulse motor by open loop control based on the count value of an internal counter is proposed by the present applicant. Are (Jitsugantaira 2-31476
issue).

(Problems to be Solved by the Invention) By the way, if the throttle valve control system (pulse motor and throttle valve and its control system) (hereinafter referred to as “throttle system”) does not fail, the TCS operating condition is satisfied ( (Pulse motor needs to be closed and controlled.)
Within a predetermined time (for example, 1 second) after that, the pulse motor should be driven from the standby position on the throttle fully open side to the target throttle opening position. Therefore, normally, the initialization condition of the pulse motor (a stable state in which a predetermined time has elapsed since the throttle valve was driven to the target opening degree and stopped by the motor) before the predetermined time has elapsed is satisfied,
Initialization processing is performed.

However, i) step-out due to insufficient torque of the pulse motor due to a drop in the power supply voltage of the battery, etc. ii) mechanical engagement of the throttle valve, bending of the link, ii) instantaneous failure of the throttle sensor, and other failures. In this case, the pulse motor cannot be driven normally, so that the initialization condition remains unsatisfied even if a predetermined time elapses after the TCS operation condition is satisfied. When waiting for the initialization condition to be satisfied as in the conventional control, feedback control based on the detected value of the throttle sensor is continued even though the throttle system is faulty, and the pulse motor normally reaches the target. Since it becomes impossible to move to the throttle opening, there is a problem that the engine output is not properly reduced and the slip of the drive wheels is not eliminated.

The present invention has been made to solve such a conventional problem, and accurately determines that the throttle system has failed, and stops the throttle valve control in the event of a failure, thereby controlling the drive wheels by erroneous throttle valve control. To provide an engine output control device for a vehicle that can execute an engine output reduction function by a control other than the throttle valve control as, for example, TCS control when the throttle system fails. The purpose is to:

In order to achieve the above object, the present invention provides a throttle valve control means for driving a throttle valve of an internal combustion engine in a closing direction by controlling the driving of a pulse motor. An engine output reducing means for reducing an engine output by the throttle valve control means when a specific driving state of the vehicle is detected, wherein the throttle valve opening detecting the opening degree of the throttle valve is provided. Degree detecting means, an accelerator pedal opening detecting means for detecting an accelerator pedal opening, and an accelerator pedal opening detected by the throttle valve opening detecting means detected by the accelerator pedal opening detecting means. When the pulse motor is stopped for a first predetermined time, A pulse motor reference opening determining means for determining and storing an output value of the throttle valve opening detecting means as a reference opening of the initial position of the pulse motor; and a drive control of the pulse motor by the throttle valve control means. If the determination of the reference opening by the pulse motor reference opening determining means has not been completed when a second predetermined time has elapsed since the start of the driving of the throttle valve in the closing direction by the motor, the throttle valve An engine output control device for a vehicle, comprising: an abnormality determination unit configured to determine that the control unit is in an abnormal state.

According to a second aspect of the present invention, there is provided a forced opening drive means for forcibly opening the pulse motor to the throttle valve fully open position when the throttle valve control means is determined to be in an abnormal state.

Further, according to claim 3 of the present invention, the engine output reducing means further includes at least one of a fuel injection amount reducing means and an ignition timing retarding means, and it is determined that the throttle valve control means is in an abnormal state. In this case, the control by the throttle valve control means is prohibited, and at least one of the fuel injection amount reducing means and the ignition timing retarding means is controlled to reduce the output of the engine.

(Operation) When the specific operation state of the vehicle is detected and the engine output reducing means of the engine output control device of the vehicle is operated, the pulse motor which has been waiting on the throttle valve fully open side is driven in the throttle valve closing direction by the throttle valve control means. When the throttle valve opening is smaller than the accelerator pedal opening and the state in which the pulse motor is stopped continues for the first predetermined time, the pulse motor reference opening determining means changes the output value of the throttle valve opening detecting means. It is determined and stored as the reference opening of the initial position of the pulse motor. After the determination of the reference opening, the position control of the pulse motor is performed based on the reference opening. The abnormality determining means is configured to control the drive of the pulse motor by the throttle valve control means, and to start the second drive from the start of the throttle valve in the closing direction by the pulse motor.
If the determination of the reference opening by the pulse motor reference opening determination means is not completed when the predetermined time has elapsed, it is determined that the throttle valve control means is in an abnormal state.

When the abnormality of the throttle valve control means is determined, the panel motor is forcibly driven to the fully open position of the throttle valve. Alternatively, the control by the throttle valve control means is prohibited, and at least one of the fuel injection amount reduction control and the ignition retard control is controlled to reduce the engine output.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram of a traction control system (TCS) to which an engine output control device for a vehicle according to an embodiment of the present invention is applied.
A throttle body 3 is provided in the middle of the intake pipe 2.
A throttle valve 4 is disposed inside the throttle valve. A throttle valve opening (θ _TH ) sensor 5 is connected to the throttle valve 4, and outputs an electric signal corresponding to the opening of the throttle valve 4 and supplies it to an electronic control unit (hereinafter referred to as “ECU”) 6. I do.

Further, a vehicle accelerator pedal 15 is connected to the throttle valve 4 by a wire (not shown). An accelerator pedal opening (θ _AP ) sensor 16 is connected to the accelerator pedal 15, and outputs an electric signal corresponding to the opening of the accelerator pedal 15 to supply the electric signal to the ECU 6.

Furthermore, a panel motor 7 is drivingly connected to the throttle valve 4.

When the TCS is not operated (during normal operation), the throttle valve 4 is operated by the accelerator pedal 15 via a wire.
During operation, the driving is controlled by the panel motor 7 as described later.

The fuel injection valve 8 is provided for each cylinder between the engine 1 and the throttle valve 4 and slightly upstream of an intake valve (not shown) of the intake pipe 2, and each injection valve is connected to a fuel pump (not shown). Is electrically connected to ECU 6
The valve opening time of fuel injection is controlled by a signal from U6.

On the other hand, immediately downstream of the throttle valve 4, an intake pipe absolute pressure ( _PBA ) sensor 9 'is provided through a pipe 9 so as to communicate with the inside of the intake pipe 2. The absolute pressure sensor 9' converts an electric signal into an electric signal. The converted absolute pressure signal is supplied to the ECU 6.

The engine speed (Ne) sensor 10 is mounted around a camshaft (not shown) of the engine 1 or around a crankshaft. The engine speed sensor 10 outputs a TDC signal panel at a predetermined crank angle position each time the crankshaft of the engine 1 rotates by a predetermined angle.
Supplied to 6.

Further, the ECU 6 includes driving wheel speed sensors 11 and 12 for detecting rotation speeds W _FL and W _FR of left and right driving wheels (not shown), and rotation speeds W _RL and W _{RL of} left and right driven wheels (not shown). Driven speed sensors 13 and 14 for detecting W _RR are connected, and these sensors 11 to 14 supply detection signals to the FCU 6.

In this embodiment, the ECU 6 is a part of the throttle valve control means, a part of the accelerator pedal opening detection means, the pulse motor reference opening determination means, the abnormality determination means, the forced opening drive control means, the output reduction means, etc. Is configured.

The ECU 6 shapes input signal waveforms from various sensors, corrects a voltage level to a predetermined level, and converts an analog signal value to a digital signal value. The input circuit 6a has a function of a central processing unit (hereinafter referred to as a “CPU”). 6b), a storage means 6c for storing various calculation programs executed by the CPU 6b, calculation results and the like, an output circuit 6d for supplying drive signals to the fuel injection valve 8 and the pulse motor 7, and the like.

The CPU 6b determines various engine operating states based on the various engine parameter signals described above, and according to the engine operating state, determines the TDC based on the following equation (1).
The fuel injection time T _OUT of the fuel injection valve 8 synchronized with the signal pulse
Is calculated.

T _OUT = Ti × K ₁ + K ₂ (1) Here, Ti is a basic fuel injection time determined according to a basic fuel amount, for example, the engine speed Ne and the intake pipe absolute pressure _PBA .

K ₁ and K ₂ is a correction coefficient and correction variable computed according to various engine parameter signals, predetermined as fuel consumption characteristic according to engine operating conditions, the optimization of various properties such as the engine acceleration characteristics can be achieved Determined by the value.

The CPU 6b outputs a drive signal for opening the fuel injection valve 8 based on the fuel injection time T _OUT obtained as described above in an output circuit.
The fuel is supplied to the fuel injection valve 8 via 6d.

Further, the ECU 6 calculates the average value Vw (= ( _WFL + _WFR ) / 2) of the left and right driving wheel speeds and the average value Vv (= ( W _RL + W _RR ) / 2) is calculated, and the slip ratio λ of the drive wheels is calculated from the calculated average values Vw and Vv based on the following equation (2).

At this time, when the slip ratio λ exceeds a predetermined value (for example, 5%), the ECU 6 outputs a control signal to the pulse motor 7 to control the throttle valve opening θ _TH .

FIG. 2 is a flowchart of a control program of the TCS of FIG.

This program is executed by a timer built in the ECU 6 every predetermined time (for example, 2 ms).

First, in step S1, the analog value of the throttle valve opening θ _TH detected by the throttle valve opening sensor 5 is converted to a digital value. Next, in step S2, it is determined whether the TCS is operating. As described above, the TCS has a predetermined value (eg, 5
%) Or more, it operates to quickly eliminate the slip of the drive wheels. If the answer in step S2 is negative (No),
When the TCS is not operated (during normal operation), the program is terminated, and the throttle valve 4 is controlled by operating the accelerator pedal. When the TCS is not operating, the pulse motor 7 does not operate and stands by on the throttle valve fully open side (FIG. 4 (a)).

When the answer to step S2 is affirmative (Yes), that is, when the TCS is activated, it is determined whether or not the throttle valve 4 target opening θ _THO has been calculated (step S3). The target opening θ _THO of the throttle valve 4 is calculated based on a predetermined calculation formula from the slip ratio of the drive wheels calculated by the above formula (2) at the start of the TCS operation. The calculation of θ _{THO in} step S3 is executed by the second timer at every second predetermined time (for example, 10 ms).

When the answer to step S3 is affirmative (Yes), that is, when the target opening θ _THO of the throttle valve 4 is calculated, the throttle valve 4 is driven by the pulse motor 7 to the valve closing side (fourth).
Figure (b). At the same time, the CPU 6b executes Step S4 and subsequent steps to be described later to control the throttle valve opening θ _TH to the target opening θ _THO . If the answer to step S3 is negative (No), the target opening θ of the throttle valve 4 has not yet been set since the start of the TCS operation.
_{Since THO} has not been calculated, this program ends.

Next, in step S4, it is determined whether or not the flag F _INIT is 1, that is, whether or not the reference value (reference opening) of the pulse motor position has been determined (initialized). The reference value, which is the initial position of the motor position, is used when performing position control of the pulse motor 7 by open-loop control. The determination in step S4 is performed by a program shown in FIG. _INIT is set to 1 when the reference value of the motor position is determined.

The answer to step S4 is affirmative (Yes), that is, the pulse motor 7
When the reference value of the motor position is determined (when the flag F _INIT is set to 1 in step S39 in FIG. 3), the difference between the target opening θ _THO of the throttle valve and a pulse counter value θ _THP described later is determined. It is determined whether the difference (θ _THO −θ _THP ) is positive (step S5), and the answer is affirmative (Yes), that is, (θ _THO
When - [theta] _THP) value is positive, the flag F _DIR is set to 0 (step S6), and the absolute value of the difference | θ _THO -θ _THP | and the throttle valve opening command value theta _CMD (step S7 ). If the answer to step S5 is negative (No), that is, (θ _THO −θ _THP )
If the value is negative, the flag F _DIR is set to 1 (step
S8), and proceed to step S7.

On the other hand, when the answer to step S4 is negative (No), that is, when the reference value of the motor position of the pulse motor 7 is not determined (when the flag F _INIT is set to 0), the throttle valve opening sensor 5 Is determined (step S9), and if the answer is negative (No), that is, if the sensor 5 has not failed, the target opening θ _THO of the throttle valve 4 and the current loop are determined. It is determined whether the difference (θ _THO −θ _TH ) from the throttle valve opening θ _TH is positive (step S10), and the answer is affirmative (Yes), that is, (θ _THO −θ _TH ).
If the value is positive, the flag _FDIR is set to 0 (step S1).
1), as in step S7, the absolute value of the difference | θ _THO −
θ _TH | is set as the throttle valve opening command value θ _CMD (step S12). If the answer in step S10 is negative (No), that is, (θ
_{If the (THO-} θ _TH ) value is negative, the flag F _DIR is set to 1 (step S13), and the routine proceeds to step S12. On the other hand, if the answer to step S9 is affirmative (Yes), that is, if the throttle valve opening sensor 5 has failed, the process proceeds to step S5.

As described above, in order to determine the rotation direction of the pulse motor 7, each difference between the target opening θ _THO of the throttle valve opening 4 and the counter θ _THP value or the throttle valve opening θ _TH (θ _THO −
The flag F _DIR is set in accordance with the sign of (θ _THP ) and (θ _THO -θ _TH ) (steps S6, S8, S11, S13), and the difference between the above differences is determined in order to determine the required rotation amount of the pulse motor 7. Absolute value |
θ _THO −θ _THP | and | θ _THO −θ _TH | are the throttle valve opening command values (the number of output pulses) θ _CMD (steps S7 and S1).
2).

While the open loop control based on the pulse counter θ _THP value is performed according to the difference | θ _THO −θ _THP | (step S7), the throttle valve is opened according to the difference | θ _THO −θ _TH | (step S12). Feedback control based on the degree θ _TH is performed.

Furthermore, even if the throttle valve opening sensor 5 fails (the answer to step S9 is affirmative (Yes)), the process for determining the initial position of the remotor is being executed (step S40 in FIG. Is affirmative (Yes), the pulse counter θ _THP
An abnormal value can be prevented from entering the value, and the pulse motor 7 is continuously driven by open loop control based on the counter θ _THP value.

Next, proceeding to step S14, the throttle valve opening command value θ _CMD determined in step S7 or S12 is _compared with the pulse output determination threshold value θ of the two-phase excitation mode of the pulse motor described later.
Determine whether it is greater than _HOLD . If the answer to step S14 is affirmative (Yes), that is, if θ _CMD is larger than θ _HOLD , the process proceeds to step S15, and the flag F _EQU (step S36 in FIG. 3)
Is set to 0. The flag F _EQU is set to 1 when the pulse motor 7 is stopped, and is set to 0 when the pulse motor 7 is rotating. Subsequently, it is determined whether or not the flag _FDIR is 0 (step S16), and the answer is affirmative (Yes), that is, the flag _FDIR = 0.
In order to rotate the pulse motor 7 in the opening direction, the pulse counter θ _THP value is added with a unit advance θ _{2 phase} in a two-phase excitation mode (a method of simultaneously exciting two excitation coils) of the pulse motor 7. Next loop pulse counter θ _THP
Then, according to the excitation phase pattern of the pulse motor 7 in step S18, a normal duty output (for example, 50%) is output in step S19, and the program ends.

On the other hand, if the answer to step S16 is negative (No), that is, if the flag F _DIR = 1, the unit advance angle θ _{2 phase} is subtracted from the pulse counter θ _THP value to rotate the pulse motor 7 in the closing direction. The value of the pulse counter θ _THP of the next loop is set (step S20), and the process proceeds to each of steps S18 and S19.

On the other hand, the answer to step S14 is negative (No), that is, θ _CMD
Is less than θ _HOLD , the flag F _{EQU is set} to 1 in step S21.
Is set, and the pulse motor is stopped (a predetermined hold current is supplied to hold the pulse motor in a stopped state) (step S22), and the program is terminated.

FIG. 3 shows a program for determining the initial position of the pulse motor and detecting a throttle system abnormality.

This program is also executed every predetermined time (for example, 10 ms).

In FIG. 3, first, in a step S31, it is determined whether or not the TCS is operating. If the answer in step S31 is negative (N
o), that is, when the TCS is not operating (during normal operation),
Proceeding to S32, an initial timer INITTM for setting a predetermined time, which is one of the initial position determination conditions of the pulse motor 7, and a predetermined time for determining a failure of the throttle valve (the pulse motor, the throttle valve and its peripheral elements) are determined. Reset the initial error timer INTERRTM to be set and terminate this program.

When the answer to the step S31 is affirmative (Yes), that is, when the TCS is activated, it is determined whether or not the flag _FINIT is set to 1 in the next step S33. The flag F _INIT is set to 1 in step S39 described later when a reference value of the motor position (motor initial position) is determined. If the answer to step S33 is negative (No), that is, if the flag F _INIT is 0, the accelerator pedal opening θ _AP is equal to the target opening value θ _THO of the throttle valve 4 and the detection error correction θ _{THR of the} throttle valve opening sensor 5. It is determined whether or not the sum is larger than (step S34). Step S
If the answer to 34 is negative (No), that is, if the accelerator pedal 4 has not been depressed to an opening greater than the target opening θ _THO , the process proceeds to step S32 and the initial timer INITT
Reset M and the initial error timer INTERRTM, and terminate this program. On the other hand, the answer to step S34 is affirmative (Yes), that is, the accelerator pedal 4 is
_{If the} opening is greater than _THO , the process proceeds to step S35, where the accelerator pedal opening θ _AP is calculated from the sum of the detected throttle valve opening θ _TH of the throttle valve opening sensor 5 and the detection error correction θ _THR. It is determined whether it is larger. The answer is affirmative (Yes), that is, the throttle valve 4 is
Is controlled to the valve closing side by the accelerator pedal opening θ _AP
Is larger than the sum of the actual throttle valve opening θ _TH and the detection error correction θ _THR (FIG. 4B), it is determined whether or not the flag F _EQU is set to 1 (see FIG. 4B). Step S36). The answer to step S36 is affirmative (Yes), that is, the pulse motor 7 is stopped and the flag F _EQU is set to 1, that is, the accelerator pedal is depressed to an opening larger than the target opening value θ _THO. When the accelerator pedal opening θ _AP is larger than the actual throttle valve opening θ _TH and the pulse motor 7 is stopped (the answers of steps S34, S35 and S36 are both affirmative (Yes)), the initials are set in step S37. Start or continue counting of the timer INITTM (if this loop is the first loop immediately after TCS ON (the answer to step S31 is affirmative)), start the counting. Continue), whether or not the count of the initial timer INITTM has been completed in the next step S38, that is, whether or not the state of θ _AP > θ _TH + θ _THR and F _EQU = 1 has continued for a predetermined time (for example, 20 ms) Determine whether or not That (step S38). The answer to step S38 is affirmative (Ye
s) That is, when the above condition is continued for the predetermined time and the predetermined motor initial position determination condition is satisfied, it is considered that the positional relationship between the pulse motor 7 and the throttle valve opening sensor 5 is stable. (FIG. 4 (c)), the detected throttle valve opening value θ _TH at that time is set as a pulse count value θ _THP in a pulse counter in the ECU 6, and the detected throttle valve opening value θ _{TH is set} to the motor position. Reference value θ
Stored in the storage unit 6c as _THPINIT, further set the flag F _INIT to 1 (step S39), and terminates the program. In the stable state shown in FIG. 4 (c), the actual opening degree of the throttle valve θ _TH ≒ the target opening degree value of the throttle valve θ _THO holds.

Returning to step S33, if the answer is affirmative (Yes), that is, if the flap F _INIT is 1 and the reference value of the motor position is determined, it is determined whether or not the initial position of the motor should be determined again.
That is, the target opening value θ _THO of the throttle valve 4 is determined as the reference value of the motor position.
_It is determined whether it is smaller than _THPINIT (step S40).
If the answer is negative (No), that is, θ _THO ≧ θ _THPINIT holds, the program is terminated as it is. On the other hand, if the answer is affirmative (Yes), that is, θ _THO <θ _THPINIT holds, the initial timer INITTM and the initial error timer INTERRTM are reset, and the flag F _INIT is reset.
Is set to 0 (step S41), the process proceeds to step S34, and the initial position determination process of the pulse motor 7 is performed again by executing steps 34 to S39. Even after the reference value of the motor position is once determined (step S3
3 is affirmative (Yes), the target opening value θ of the throttle valve 4
_{When THO} becomes smaller than the throttle valve opening θ _THPINIT determined as the reference value of the motor position (step S40).
Is affirmative (Yes), and the motor initial position determination processing (steps S34 to S39) is executed again. This throttle valve opening theta _TH of the above-mentioned throttle valve is detected errors who as possible the throttle valve opening theta _TH from the output characteristic detected by the small opening side of the opening sensor 5 becomes small low opening side This is because the accuracy of the position control of the pulse motor 7 is improved by determining the reference value θ _THPINIT of the motor position.

On the other hand, when the TCS is moving and the initial position of the pulse motor 7 has not been determined, the accelerator pedal 4 is moved to the target opening value θ.
_The state where the degree of depression is greater than _THO (step S31 is affirmative (Yes), step S33 is negative (No) and step S3
4 is affirmative (Yes)), the answer of step S35 is negative (No),
That is, when the accelerator pedal opening θ _AP is smaller than the sum of the throttle valve opening θ _TH and the detection error correction θ _THR , the throttle valve 4 is not driven to the valve closing side by the pulse motor 7, that is, the motor is out of step. Indicates the occurrence of mechanical engagement of the throttle valve, etc. In this case, after resetting the initial timer INITTM in step S42, the counting of the initial error timer INTERRTM is started or continued in the next step S43 (first after TCS ON) In this loop, the counting is started, and the counting is continued when the current loop is continued thereafter.)

Also, if the step S35 is affirmative (Yes), that is, the rottle valve 4 is controlled in the throttle valve closing direction by the pulse motor 7, but the pulse motor 7 does not stop (the answer of step S36 is negative (No), that is, the flag (When F _EQU = 0)
After resetting the initial timer INITTM in step S42, the initial error timer INTERRT is reset in step S43.
Start or continue counting M.

Further, the throttle valve 4 is driven in the throttle valve closing direction by the pulse motor 7, the motor 7 is stopped, and the count of the initial timer INITTM is started (both steps S35 and S36 are affirmative, and the processing of step S37 is started). ,
Even when the counting of the timer INITTM is not completed (the answer of step S38 is negative (No)), the counting of the initial error timer INTERRTM is continued at step S43.

Then, in a step S44 following the step S43, it is determined whether or not the counting of the initial error timer INTERRTM is completed. After the TCS is turned on in step S31, the initial error timer INTERRTM determines whether any of the steps S35, S36, and S38 for determining the pulse motor initial position determination condition is negative (No), that is, the pulse motor Unless the initial position determination condition is satisfied, the counting is continued (step S43). The answer in step S44 is affirmative (Yes),
That is, when the count value of the timer INTERRTM is finished during a predetermined time after TCS ON (for example, 1 second) has elapsed, 1 flag F _THAPFS as an initial position determination impossible of the pulse motor 7, i.e. a failure in the throttle system is generated (Step S45), and the program ends. The flag F _THAPFS
Is set to 1, the control by the TCS is switched to at least one of the fuel injection amount reduction and the ignition timing retard control after the pulse motor 7 is forcibly driven to the throttle valve fully open position by another program (not shown). Control is performed. On the other hand, if the answer to step S44 is negative (No), that is, if the count of the initial error timer INTERRTM is not completed, the program is immediately terminated.

As described above, according to the present embodiment, any of the conditions of steps S35, S36 and S38 for determining the initial position determination condition of the pulse motor from the start of the operation of the TCS is not satisfied, and the initial position of the motor is not determined. , Initial error timer IN
Since the count of TERRTM is continued and the throttle system is determined to be in a failure state when the timer continues counting for a predetermined time, it can be accurately determined that the throttle system has failed. By stopping the throttle valve control, it is possible to prevent drive wheel control due to incorrect throttle valve control. When the throttle system breaks down, the pulse motor is forcibly returned to the fully open position, and then the throttle valve control is prohibited, so that the influence of unstable throttle valve control can be eliminated, and the throttle valve stops at the intermediate position. As a result, it is possible to prevent the occurrence of acceleration failure (throttle valve does not open by the required value). Furthermore, when the throttle system fails, the function as TCS control can be secured by switching to TCS by fuel injection amount reduction control or ignition timing retard control.

(Effects of the Invention) As described in detail above, according to the first aspect of the present invention, the throttle valve control means for driving the throttle valve of the internal combustion engine in the closing direction by controlling the driving of the pulse motor, and identifying the vehicle. An engine output control device for a vehicle, comprising: an engine output reducing unit configured to reduce an engine output by the throttle valve control unit when an operation state is detected; a throttle valve opening detection unit configured to detect an opening of the throttle valve; Accelerator pedal opening detecting means for detecting the accelerator pedal opening, throttle valve opening detected by the throttle valve opening detecting means is smaller than accelerator pedal opening detected by the accelerator pedal opening detecting means, and When the state in which the pulse motor is stopped continues for a first predetermined time, the throttle valve opening detection A pulse motor reference opening determining means for determining and storing the output value of the stage as a reference opening of the initial position of the pulse motor; and a drive control of the pulse motor by the throttle valve control means. If the determination of the reference opening by the pulse motor reference opening determining means is not completed when the second predetermined time has elapsed since the start of the drive in the closing direction, the throttle valve control means is in an abnormal state. Abnormality judgment means for judging that the throttle valve control means is in a wrong position.Thus, it is accurately judged that the throttle valve control means has failed. Prevention of being disturbed.

According to the second aspect of the present invention, there is provided control opening driving means for forcibly opening the pulse motor to the throttle valve fully open position when it is determined that the throttle valve control means is in an abnormal state. Driving the throttle valve stably and stopping the throttle valve at the intermediate position can be prevented.

Still further, according to claim 3, the engine output reducing means further includes at least one of a combustion injection amount reducing means and an ignition timing retarding means, and when it is determined that the throttle valve control means is in an abnormal state. Inhibits the control by the throttle valve control means and controls at least one of the fuel injection amount reducing means and the ignition timing retarding means to reduce the output of the engine.For example, when the present invention is applied to TCS control, Has an effect that the function of TCS control can be secured.

[Brief description of the drawings]

FIG. 1 is a diagram showing the overall configuration of a traction control system to which the present invention is applied, FIG. 2 is a flowchart showing a throttle valve control program of the system of FIG. 1, and FIG. FIG. 4 is a conceptual diagram showing the positional relationship among the accelerator pedal 15, the throttle valve 4, and the pulse motor 7. 4 throttle valve, 5 throttle valve opening sensor (throttle valve opening detecting means), 6 ECU (part of throttle valve control means, part of accelerator pedal opening detecting means, pulse motor reference opening determining means 7; pulse motor; 16 ... accelerator pedal opening sensor (accelerator pedal opening detecting means).

Claims (3)

(57) [Scope of request for utility model registration] 1. A throttle valve control means for driving a throttle valve of an internal combustion engine in a closing direction by controlling the driving of a pulse motor, and reducing the output of the engine by the throttle valve control means when a specific operating state of a vehicle is detected. An engine output control device for a vehicle, comprising: a throttle valve opening detecting unit that detects an opening of the throttle valve; an accelerator pedal opening detecting unit that detects an accelerator pedal opening; When the throttle valve opening detected by the throttle valve opening detecting means is smaller than the accelerator pedal opening detected by the accelerator pedal opening detecting means and the state in which the pulse motor is stopped continues for a first predetermined time. The output value of the throttle valve opening detecting means is set to a reference opening of the initial position of the pulse motor. A pulse motor reference opening determining means for determining and storing the pulse motor; and the throttle valve control means for controlling the driving of the pulse motor, and a second predetermined time from when the driving of the throttle valve in the closing direction by the pulse motor is started. Abnormality determination means for determining that the throttle valve control means is in an abnormal state if the determination of the reference opening degree by the pulse motor reference opening degree determination means has not been completed when the time has elapsed. An engine output control device for a vehicle. 2. A forced opening drive means for forcibly opening the pulse motor to a throttle valve fully open position when the throttle valve control means is determined to be in an abnormal state. 2. The engine output control device for a vehicle according to claim 1. 3. The engine output reducing means further includes at least one of a fuel injection amount reducing means and an ignition timing retarding means, and when it is determined that the throttle valve control means is in an abnormal state, the throttle valve control means. 2. The engine output control device for a vehicle according to claim 1, wherein the control of the engine output is inhibited, and at least one of the fuel injection amount reducing means and the ignition timing retarding means is controlled to reduce the output of the engine.