JPS6371543A - Output controller for internal combustion engine of automobile - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an output control device for an internal combustion engine of an automobile, and more specifically to a throttle valve that changes the flow rate of combustion air and an electric adjustment that positions the throttle valve. The present invention relates to an output control device for an internal combustion engine of an automobile, including a device, a position sensor for detecting the position of a throttle valve, and means for monitoring the sensor.

[Prior Art] DE 1514113 describes a device for controlling the running speed of a motor vehicle, which device is mainly formed by an electrical position adjustment device, the setpoint value input terminal of which has a setpoint value input terminal. For example, a signal from a position sensor integrated with the accelerator pedal is input. The control circuit is supplied with a signal from a position sensor in the regulating mechanism of the electric regulating device as an actual value signal, by means of which the fuel-air mixture is regulated. In this device, therefore, a simple adjustment device is provided which converts, for example, the position of the accelerator pedal into the position of the throttle valve of the internal combustion engine.

[Problems to be Solved by the Invention] However, there are two major drawbacks to known positioning devices. If at least one of the mechanical and electrical position sensors fails, the control circuit becomes inoperable, so that dangerous driving conditions of the motor vehicle cannot be avoided. This is because in that case it is possible for the adjusting device to occupy an undefined position, in particular the position of the end stop. Moreover, after this type of defect has occurred, the car can no longer be driven. U.S. Patent Publications Nos. 3,722,492 and 430,535
In the device according to No. 9, in order to improve the safety of a control circuit of this kind, the above-mentioned actual value signal and setpoint value signal from a position sensor in the standby state can, for example, be changed to an extreme position (for example a rest position or It is known to provide switching contacts which close or open when a maximum steering position is occupied, thereby providing further position signals. This position signal must always be in a valid relationship with the adjustment signal.

If a lack of reasonability is recognized, an alarm signal can be generated or the internal combustion machine can be shut down. However, even with the above-mentioned embodiment of the known regulation control circuit of an internal combustion engine, for example, it is still not possible to carry out an emergency driving operation, for example, to drive the motor vehicle to the nearest factory. Although such a method increases driving safety, the motor vehicle cannot be used, especially if the position sensor installed in the electrical regulating device for actuating the throttle valve fails.

It is therefore an object of the invention to further develop the known safety concept in order to increase the possibilities of using the motor vehicle, in particular the emergency driving possibility of the motor vehicle in the event of a failure of the position sensor of the regulator of the throttle valve of the internal combustion engine. An object of the present invention is to provide an output control device for an internal combustion engine of an automobile, which is improved.

[Means for solving the problem] In order to achieve the above-mentioned object, according to the invention, in the event of a failure of the throttle valve position sensor or of the means for monitoring the same, the actual value signal is used to detect other operating conditions of the internal combustion engine. An arrangement is provided in which it is possible to control at least one other operating parameter of the internal combustion engine by additionally processing the output signal of at least one sensor for detecting the parameter.

[Function] According to the above configuration, even if the position sensor that detects the position of the throttle valve fails, emergency driving can be performed while maintaining the driving safety of the automobile.

[Example] Embodiments of the invention are shown in the drawings and explained in detail below.

The output control device for an internal combustion engine of a motor vehicle according to the present invention shown in FIG. 1 is provided with a hardware module 1o and a software module 20 that operate in conjunction with each other. Although the hardware module 10 can also be used only for configuring the device according to the invention for controlling the output of an internal combustion engine of a motor vehicle, it also operates in conjunction with the software module 20 on a time-by-time basis. It is also possible to form a part of a microcomputer control device of a motor vehicle, which sequentially executes the functions according to the present invention. The hardware module 10 includes an arithmetic logic unit (ALU) that has a clock generation function and a timer function.
A computer is provided which includes a memory area 111, a read memory (ROM) 116 and a read/write memory (RAM) 117, a memory unit 114, a memory unit 115, and an address/data bus 112. Connected to the input unit 114 are various analog input channels that are selected by a multiplexer, and these channels are designated in this embodiment as, for example, 118 to 12.
2 and 148. Another input port 123 may be provided to accept simple logic state signals.

Input unit 114 provides signals to bus 112 (flag bank). Conversely, a signal is supplied from the bus 112 to the output unit 115. In this embodiment, the output unit 115 is provided with driver output stages 124 to 126 for driving electric adjustment devices 134, 135, etc. via lead wires 147, 154, etc., for example. Electric adjustment device 134
is, for example, a drive motor for driving a throttle valve of an internal combustion engine, which is operatively connected to a mechanical-electrical sensor formed as a throttle valve position sensor 127 . The position sensor 12
7 supplies a position signal to the input port 118 of the input unit l-1, 14 via a lead wire 138. Block 13
Reference numeral 2 is, for example, a switching contact which is closed or opened by the shaft of the throttle valve in a predetermined position;
The validity (re) of the redundant (redundant)
It is a monitoring means that performs an asonableness test and performs a redundancy test.

Block 132 is connected to state detection input port 123 via at least one conductor 143 . It is also possible to connect other status detection lines 145 to this human power port, which input monitoring signals that are particularly important for the safety of motor vehicles. The accelerator pedal position sensor 128 is preferably connected to the accelerator pedal and converts the position of the accelerator pedal into an electrical signal (target value signal) indicating the driver's intention, and this electrical signal is transmitted via a lead wire 139 to an input signal. 114 to input port 119. Additionally, a switching means 13 for checking the validity of this position sensor outputs a logical test signal to the state detection input port 123 of the input crab unit 114 via the state detection line 144.
It can also be connected to 3.

Although blocks 129, 130, and 131 do not have to be provided all together, they are becoming essential elements in modern internal combustion engine electronic central control units.

The block 129 is a pressure sensor provided in the intake passage, and is connected to the input port 120 of the intake unit 114 via a lead wire 140. Block 130 is an air flow sensor, preferably an air flow sensor, which converts the combustion air flow into an electrical signal that is transmitted via lead 141 to input port 12 of inlet unit 114.
1. Block 131 is, for example, a current-to-voltage converter, which converts the drive current of throttle valve regulator 134 into a suitable measuring voltage indicative of the position of the throttle valve. This measured voltage is supplied to the input port 122 of the input unit 114 via the lead wire 142. In the simplest case, this current-to-voltage converter can be formed by a measuring resistor that is connected to a suitable reference potential and passes the drive current of the motorized regulating device 134. If the components of the hardware module 10 have adequate processing capacity, the ignition excitation circuit can be connected directly or sub-directly to the output unit's driver output stage 126 as well as the motorized regulator shown at 135.
Can be connected via module.

The software module 20 performs feedback adjustment functions according to program instructions, such as P.
It performs a similar function to hardware such as ID adjuster 210 and conventional comparator 211. A data line 212 supplies target value data 213 and actual value data 214 to an algorithm that implements the function of the comparator 211 . The comparison results are input to the algorithm that implements the function of the regulator 210, and the data obtained as a result of the regulation is transferred to the software module 20 and the ROM configured as hardware.
/RAM memory 116711.7 is connected to data line 212 in both directions.

Unless the position sensor 127 or the plausibility monitoring means 132 are defective, the hardware module 10
10 is supplied with a series of parameter values via data line 212. This set of parameter values is selected to ensure optimal operating characteristics by adaptation to the internal combustion engine and the corresponding motor vehicle using the usual actual value signals available at the input port 118.

The read memory (RO
M) By constantly repeating the procedure using the test values stored in the input port 116, the position signal of the position sensor 127 obtained through the input port 118 is transmitted to the state detection line 143.
It is detected whether or not there is a valid relationship with the inspection information output from the monitoring means 132 via the inspection means 132. If there is not a valid relationship, the software module automatically deactivates the regulating system 137 via the program and converts other state variables of the internal combustion engine, such as the pressure sensor 129, the air flow sensor 130 or the regulating current. The output signal of the current-voltage converter 131, etc. is used as an auxiliary (
(instead of that). One auxiliary signal is usually sufficient for this purpose. However, a large number of sensors are provided that measure various operating parameters, the output signals of which are processed by a computer-based controller. It is therefore also possible to refer to two or more auxiliary actual value signals in combination as auxiliary actual value signals.

According to the invention, if a defect in the regulating system 137 is recognized that is not due to a defect in the regulating device 134, the software module 20 is removed from the hardware module 10.
Auxiliary signal and regulating device 13 serving as actual value signal to
A series of statically or dynamically implemented parameter values is transmitted, each adapted to the specific relationship between the position and the auxiliary signal provided by 4. This means that the auxiliary parameter values, which are fixedly stored in the readout memory (ROM) 116 and assumed to occur in the case of this type of failure, are stored on the data line 21.
This is done by being fed via 2 to the regulation algorithm forming the regulator. Alternatively, the supply of the auxiliary parameter values to the adjustment algorithm can be such that the auxiliary parameter values, which are permanently stored, for example in a read-out memory (ROM) 116, are first determined by the arithmetic and logic unit 11 in relation to the operating state.
1 into an actual parameter value, which is then stored in the read/write memory (RA, M) 117 and processed via the read/write memory (RAM) 117.

By means of such measures, even if, as already mentioned, the throttle valve position sensor 127, which is rigidly connected to the regulating shaft of the throttle valve of the internal combustion engine, fails, the vehicle continues to be driven in relative comfort. Can be done. For this purpose, a regulating device 134 and a position sensor 1 supplying the actual value signal are required.
27 exists between the actuating variable generated by the regulating device 134 and the actual value signal brought about by it and detected by the sensors 129, 130 and 131 generating the auxiliary signal. replaced by possible functional relationships.

The simplest example of this type of functional relationship is shown diagrammatically in FIG. The rated drive current (I) of the adjusting device 134 and the rated torque (M) that the adjusting device generates against the return spring with respect to the position angle α of the throttle valve.
is illustrated. It is assumed here that the drive current of the regulating device 134 also increases linearly to the same extent that the torque increases linearly. In particular, if a linear relationship of this kind is well realized in practice, there should be a correspondence between the manipulated variable (i.e. the position angle of the throttle valve) and the drive current of the regulating device, which can be easily converted into a voltage. You can take advantage of the relationship between However, the relationship that exists between two operating parameters of the internal combustion engine, such as speed and pressure in the intake pipe, or speed and air flow rate or quantity, and the angle of the throttle valve also obtains an auxiliary actual value signal. It can be used for. This is because auxiliary actual value data can be obtained on the basis of the two operating parameters, such as data values that predetermine the setpoint value of the air flow control circuit.

Therefore, in such a case, the intention of the driver of the motor vehicle is transmitted via the position sensor 128 connected to the accelerator pedal to the corresponding computer control unit, and in the event of a malfunction, the control unit will issue a software - The module automatically switches from controlling the position of the throttle valve to controlling other operating parameters, such as air flow control or air volume control in the intake pipe, by changing the appropriate set of parameter values. This air flow control may be carried out, for example, by a second software program having a suitable control device 310 which controls the fuel injection based on an algorithm independently of the above-mentioned cases.
This is also done regularly by module 30. Regulatory system 1
37 failure occurs through the lead wire 152 to the unit 11.
5 status outputs 151 can be displayed to the driver via a warning device 153 provided. in this case,
A malfunction of the position sensor 127 and the monitoring means 132 and a defect in the regulating device 134 may result, for example, in the program and readout memory (RO).
M) adjustment and regulation device 13 based on the request of the software module 20 via the test values stored in 116;
By comparing the validity with the drive current of No. 4, it is possible to distinguish and display.

The embodiment described above is a particularly preferred example of the invention, in which, for example, the hardware module is used only for controlling the position of the throttle valve, i.e. not at the same time for performing other functions of the internal combustion engine or motor vehicle. It does not depart from the scope of the present invention to use other configurations of hardware modules where appropriate. It is also possible, for example, for the current-to-voltage converter 131 to be a functional component of the driver output stage, in which case the leads 146 are provided inside the hardware module 10.

According to the invention, a hardware module 10 is also provided for operating further regulating devices 135 and can be connected in each case to at least one other software module 30 on a time-by-time basis.

Additionally, the hardware module 10 is a software module.
By replacing the module 20.30, it is used to control the driving speed of the vehicle and the position of the throttle valve.

Furthermore, according to at least one other software module 30, a warning device 153 is activated if the throttle valve position sensor 127 or the means 132 for monitoring this position sensor has failed and a predetermined crankshaft speed has been reached. , or switched to increase the alarm strength.

This predetermined rotational speed of the crankshaft can be varied by at least one operating parameter of the internal combustion engine.

[Effects of the Invention] As is clear from the above description, according to the present invention, when the throttle valve position sensor or the means for monitoring it fails, other operating parameters of the internal combustion engine can be detected as actual value signals. The driving safety of the motor vehicle is improved because the output signal of at least one sensor can be auxiliary processed to control at least one other operating parameter of the internal combustion engine. An excellent output control device for an internal combustion engine of an automobile can be obtained, which enables emergency driving while maintaining performance.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of a device of the present invention for controlling the output of an internal combustion engine of an automobile, and FIG. 2 is a diagram showing the relationship between the position angle α of the throttle valve and the auxiliary signal. 10...Hardware module 20.30...Software module 111...
- Arithmetic logic unit 127... Throttle valve sensor 128... Accelerator pedal position sensor 129... Pressure sensor 130... Air flow rate sensor 134... Adjustment device 150... Rotation speed sensor 15
3...Alarm device

Claims (1)

[Claims] 1) A throttle valve that changes the flow rate of combustion air, an electric adjustment device (134) that electrically positions the throttle valve, a position sensor (127) that detects the position of the throttle valve, and a position sensor (127) that detects the position of the throttle valve. An output control device for an internal combustion engine of a motor vehicle, comprising means (132) for monitoring a sensor, comprising a computer (111), and an electric regulating device (134).
) is provided with a hardware module (10) having at least one output (124) for actuating said throttle valve position sensor (127) and an accelerator pedal coupled to said throttle valve position sensor (127). at least one sensor (129, 1) for detecting other operating parameters of the internal combustion engine;
Input ports (118 to 122, 148) are provided for receiving input signals from the throttle valves (30, 131, 150), and a control circuit for adjusting the throttle valve position is formed by a software module (20). - The module (20) is a control algorithm (210,
211) and a set of exchangeable parameter values (212)
the at least one sensor (129, 130, 131, 150) for detecting other operating parameters of the internal combustion engine in the event that the throttle valve position sensor (127) or the means for monitoring it fails; A power control device for an internal combustion engine of a motor vehicle, characterized in that it is possible to control the at least one further operating parameter of the internal combustion engine by additionally processing the output signal as an actual value signal. 2) The driving current supplied from the output (124) of the hardware (10) to the motorized regulating device (137) is additionally detected as an actual value signal. equipment. 3) Position sensor (128) that generates the throttle valve target value
and the value of the rotation speed sensor (150) are read from the memory (ROM).
116) is auxiliary read out as a target value signal, and the measured value of the combustion air flow rate or air amount is auxiliary used as an actual value signal for control. Apparatus according to scope 1. 4) Position sensor (128) that generates the throttle valve target value
and the value of the rotation speed sensor (150) are read from the memory (ROM).
116) is auxiliary read out as a target value, and the measured value of the intake pipe pressure is auxiliary used as an actual value signal for control.
Equipment described in Section. 5) A series of parameter values (212) adapted for controlling the operating parameters of the internal combustion engine to be auxiliary controlled can be stored in the software module. equipment. 6) A hardware module (10) is also provided for activating other regulating devices (135), each of which activates at least one other software module on a time-by-time basis.
6. Device according to claim 1, characterized in that it is connectable with a module (30). 7) The hardware module (10) is used to control the driving speed and throttle valve position of the motor vehicle by replacing the software module (20, 30). Apparatus according to any one of the ranges 1 to 6. 8) according to at least one other software module (30), the throttle valve position sensor (127) or the means (132) for monitoring this position sensor has failed;
And after the specified crankshaft rotation speed is reached, the warning device (
153) is driven or switched to increase the alarm strength.
The device according to any one of paragraphs 7 to 7. 9) Device according to claim 8, characterized in that the predetermined rotational speed of the crankshaft can be varied by at least one operating parameter of the internal combustion engine.