JPH07247852A - Acceleration control device for tcg - Google Patents

Abstract

PURPOSE:To improve responsiveness of acceleration operation by a method wherein, during rapid acceleration operation, from allowance torque of an engine, possible maximum acceleration is computed to determine target acceleration and rotating electric machine is driven as a motor. CONSTITUTION:During operation of a vehicle, it is decided by a controller 106 whether or not an accelerator pedal 108 is pedaled, namely, whether or not the pedal is in an acceleration mode. When the accelerator pedal 108 is in an acceleration mode and the accelerator pedal is completely pedaled, the number of revolutions of an engine 101 and the gear ratio of a transmission are detected and from the number of revolutions of an engine, a cap speed, and a gear ratio, allowance torque is computed. By using allowance torque, a possible maximum acceleration is computed to determine target acceleration. From an acceleration sensor, actual acceleration is computed to compute a deviation between the actual acceleration and the target acceleration. Based on an acceleration deviation, a feed current value required for drive of a rotating electric machine 103 as a motor is computed, and desired acceleration is obtained through drive of a TCG 102.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a TCG attached to an engine, and more particularly to a TC using an acceleration sensor.
G acceleration control device.

[0002]

2. Description of the Related Art A turbine is rotated by engine exhaust gas, and a compressor is rotated by its rotational driving force.
A so-called turbocharger that uses fresh air compressed by the compressor as intake air of an engine is known. Further, when there is a margin in the rotational force of the turbine due to the exhaust gas, power is generated using the ample rotational force obtained from the turbine, and when the rotational force obtained from the turbine is small, the rotation of the compressor is assisted by the motor. The so-called TCG-equipped engine has also been put to practical use. In addition, TC
Regarding the engine with G, for example, JP-A-1-15502
This is described in detail in Japanese Patent Publication No. 8.

[0003]

In the engine with TCG described above, the controller of the computer configuration grasps the operating state of the engine such as the engine speed and engine load state, and the compressor is in the over-rotating state due to the exhaust gas of the engine. Before, the rotating electric machine acts as a generator to impose a load on the turbine and prevent the turbine from over rotating. When the load on the engine increases and the engine speed starts to decrease, the rotating electric machine acts as an electric motor to assist the rotation of the compressor and supercharge the engine to increase its output. It is operated while repeating such an action. By the way, when operating a rotating electric machine as an electric motor, the control device monitors the accelerator opening and the engine speed, and when the accelerator is suddenly opened and the engine speed does not follow this, supercharging from the map is performed. Pull out the target value and continue the motor operation until the boost pressure sensor reaches the target boost pressure. However, in such a conventional device, when the accelerator pedal is depressed abruptly and greatly to increase the acceleration of the vehicle, the control is performed by indirect data called boost pressure, so that it is easily affected by disturbance and the boost pressure is not sensed. There was a drawback that the safety measures in case of system failure were inadequate.

Therefore, the present invention seeks to remedy the above-mentioned drawbacks of the prior art, and its purpose is to
In a control device for an engine with a CG, a TC that can promptly follow the acceleration operation of a vehicle while maintaining safety
It is to provide a G acceleration control device.

[0005]

In order to achieve the above-mentioned object of the present invention, the present invention provides a turbine driven by the exhaust gas energy of an engine, and a compressor for supercharging intake air into a cylinder by driving the turbine. An acceleration control device for a TCG-equipped vehicle having a rotating electric machine on a rotating shaft connecting a turbine and a compressor, a vehicle speed detecting means for detecting a vehicle speed, a gear ratio detecting means for detecting a gear ratio of a transmission, and an engine. Engine speed detecting means for detecting the number of revolutions of the vehicle, a margin torque calculating means for calculating a margin torque of the vehicle based on detection signals from the three detecting means, and a target acceleration from the margin torque from the margin torque calculating means. The target acceleration calculation means and the amount of current supplied to the TCG rotating electric machine for satisfying the target acceleration calculated by the target acceleration calculation means TCG characterized by comprising a current amount calculation means for instructing to the inverter as well as calculated
An acceleration control device for an on-vehicle vehicle is provided.

[0006]

When the accelerator pedal is stepped on rapidly and the vehicle has to be accelerated suddenly, the maximum possible acceleration is calculated from the torque margin of the engine to obtain the target acceleration, and this value is used to drive the rotating electrical machine of the TCG with a motor. . As a safety measure, after performing the above control, the boost pressure is detected, the boost pressure obtained by the calculation of the conventional method is compared with this boost pressure, and a large gap is generated between the two. At times, the TCG drive is stopped and an alarm is issued.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block configuration diagram of a TCG, and FIG. 2 is a cross-sectional view of a rotary electric machine that constitutes the TCG.

In FIGS. 1 and 2, reference numeral 101 denotes an engine, which drives a vehicle (not shown) by the combustion energy of the air sucked through the intake pipe 111 and the fuel supplied. Exhaust gas after combustion is exhaust pipe 11
2 is supplied to the turbocharger 102 via 2 to rotationally drive the turbine 121. A compressor 122 is directly connected to the rotary shaft 123 of the turbine 121 and compresses air by the torque of the turbine 121 which is rotationally driven by exhaust energy, and passes air from the intake pipe 111 to the engine through a scroll 124. To supply
The operation of the compressor 122 is configured to increase the engine output. Reference numeral 113 is a boost pressure sensor that detects the supercharging air pressure, which is attached to the inner surface of the intake pipe 111, and 114 is an engine rotation sensor that detects the engine speed. The signals from these sensors will be described later. Sent to the controller.

Reference numeral 103 denotes a rotary electric machine composed of an AC motor generator. The rotor 131 is fixed to the rotary shaft 123 with screws 134, and the housing 1 of the turbocharger 102.
25 and a stator 132 attached to the inner wall of the rotor 25. The rotor 131 is a rotor having a field magnet of a permanent magnet, for example, and constitutes a three-phase synchronous rotating electric machine together with the stator 132. . And the turbine 12 by the exhaust energy
When a sufficient driving force of the compressor 122 cannot be obtained with the driving force of 1, the electric power is supplied to the rotary electric machine 103 to cause the rotating electric machine 103 to perform power running, thereby assisting the supercharging operation of the compressor 122. As shown in FIG. 2, reference numeral 133 denotes a position sensor, which includes a permanent magnet piece 135 and a detection coil 136, and detects the rotation of the blade of the compressor 122 to detect the rotation speed and the reference position of the rotary electric machine 103. Then, the detected position signal PS is transmitted to the controller 106 (this position signal S
P substitutes for a reference position signal of turbine rotation, that is, a turbine rotation pulse. Note that FIG. 1 does not show the details of the position sensor 133, but only schematically shows its approximate installation position. An exhaust pipe 104 discharges the exhaust gas discharged from the exhaust turbine 102 to the outside.

The electric power converter 105 receives electric power from the battery 107 and converts the electric power into a predetermined AC electric power for powering the rotating electric machine 103, and rectifies the generated electric power when the rotating electric machine 103 is in a power generating operation. The battery 107 is charged with electricity. Then, the rotating electric machine 10
A rectifier for rectifying the alternating current output from the battery 3, the battery 10
It is equipped with high power equipment such as an inverter for converting the DC power of No. 7 into AC power of a required frequency. The control command for the AC frequency is issued from the controller 106.

Reference numeral 108 denotes an accelerator pedal, which controls the amount of fuel supplied to the engine 101 by a driver's operation. An accelerator sensor 181 for detecting the depression amount of the accelerator pedal 108 is attached and a detection signal is sent to the controller 106. Send out.

The controller 106 is composed of a microcomputer and is provided with a central control unit for performing arithmetic processing, various memories for storing arithmetic results and control programs, input / output ports, etc., and the boost pressure sensor 11 described above.
3, engine rotation sensor 114 position sensor 13
3. When a detection signal such as a vehicle speed signal from the accelerator sensor 181, the vehicle speed sensor, or a gear ratio from the transmission is input, arithmetic processing is performed, and the frequency of the AC power is converted to the inverter 105 according to the control program. It is configured to issue a control command to perform. Further, the TCG acceleration control device according to the present invention is incorporated in the controller 106.

FIG. 3 is a block diagram showing a TCG acceleration control device. In the figure, 1 is a boost pressure control device,
2 is an acceleration up control device. Reference numeral 3 denotes a current instruction output circuit, and the current instruction signal output from the current instruction circuit is not shown in the figure, but is applied to the inverter 105 through the interface circuit to drive the rotating electric machine 103 as a motor and drive the compressor 122. To provide supercharging subsidies. FIG. 4 is a block diagram showing the inside of the current instruction output circuit 3. In FIG. 4, 31 is a data comparison circuit and 32 is a current instruction select circuit.

Next, the operation of the present invention will be described with reference to the flow chart shown in FIG. In step 1, it is determined whether or not the accelerator pedal has been depressed. That is, it is determined whether the acceleration mode is set. If it is not in the acceleration mode, the process returns to the main routine, and if it is in the acceleration mode, the process proceeds to step 2. In step 2, the depression amount of the accelerator pedal is detected, and it is determined whether or not the accelerator pedal is completely depressed. If not fully depressed, the process returns to the main routine. If it is fully depressed, go to step 3. In step 3, the engine speed is detected and this value is temporarily stored in the RAM in the controller. In step 4, the vehicle speed is detected and this value is temporarily stored in the RAM in the controller. In step 5, the gear ratio of the transmission is detected and temporarily stored in the RAM in the controller. In step 6, the engine speed, the vehicle speed, and the gear ratio, which are temporarily stored in the RAM in the controller, are read out, and the margin torque is calculated from these parameters. In order to calculate the margin torque, a map as shown in FIG. 6 is stored in the controller for each of a plurality of gear ratios, and the map is selected according to the gear ratio during traveling, and the map is selected from the engine speed and the vehicle speed. Calculate the margin torque. This will be described in detail. It is assumed that the vehicle is currently traveling at the vehicle speed indicated by the dotted line in FIG. 6, and the driver has fully depressed the accelerator pedal from this position. As the engine speed increases, so does the vehicle speed. Since the running resistance increases as the vehicle speed increases, the maximum engine speed, which indicates the maximum fixed torque of the engine, also decreases.

In the present invention, it is intended to reach the vehicle speed desired by the driver as soon as possible. Therefore, in the present invention, the controller 10
The vehicle speed is read for each cycle time of 6, the maximum fixed time torque point corresponding to the vehicle speed is found, the difference between the former and the latter is calculated, and this is calculated as the margin torque. Again, such arithmetic operation is executed at each cycle time.

Since the gear ratio of the vehicle is different for each gear and the variation range of the vehicle speed is different, the characteristic of FIG. 6 is different for each gear. Therefore, in the present invention, as described above, a map for each gear is provided for each gear.

When the margin torque is obtained, the maximum acceleration possible is calculated using the margin torque, and then the target acceleration Vt is calculated by the following equation. Vt = Vc × K (Vc: maximum possible acceleration, K: constant)

In step 8, the acceleration of the vehicle is detected from the acceleration sensor, in step 9, the actual acceleration is subtracted from the calculated target acceleration to calculate the acceleration deviation, and in step 10, the acceleration calculated in step 9 The value of the supply current required to drive the TCG rotating electric machine as a motor based on the deviation is calculated. That is, since the acceleration change and the supply current value are in a proportional relationship, the controller 106
A proportional operation is performed within. Then, the calculated value is instructed to the inverter to drive the TCG to perform the necessary supercharging,
Get the desired acceleration.

Incidentally, the present invention is provided with the acceleration change control means by the TCG boost pressure which has been conventionally used. This acceleration change control means is a boost pressure sensor 11
The difference between the boost pressure value obtained from 3 and the boost pressure required to reach the desired engine speed calculated in 3 is calculated, and the rotary electric machine is driven to rotate by this calculated value. It is to let.

In the present invention, the controller 116 is provided with means for comparing the current instruction value with the current instruction value in the conventional apparatus after the above current instruction is given.
While the comparison value is within the predetermined range, the operation of the device of the present invention is continued, but when the comparison value exceeds the allowable error, the driving of the TCG is stopped and an alarm is issued.

With this additional configuration, this embodiment has the following advantages. Boost pressure sensor
Accelerometer-
Control can be realized. As a backup when the acceleration sensor fails, control by the boost pressure sensor can be realized. The current instruction value obtained by the boost pressure control is compared with the current instruction value obtained by the acceleration control, and control is performed with the current instruction value having the larger current instruction value. It is possible to realize control that has both the advantages and the advantages of acceleration control.

[0022]

As described above in detail, in the present invention, the maximum possible acceleration is calculated from the torque margin of the engine to obtain the target acceleration, and this value drives the TCG rotating electric machine as a motor. The response is quick and the driver's needs can be implemented quickly.

[Brief description of drawings]

FIG. 1 is a block diagram of a turbocharger.

FIG. 2 is a sectional view of a rotary electric machine of a turbocharger.

FIG. 3 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 4 is a block diagram of an internal current instruction output circuit according to an embodiment of the present invention.

FIG. 5 is a flowchart of an embodiment of the present invention.

FIG. 6 is a running performance curve diagram when the gear ratio is A

[Explanation of symbols]

 1 ... Boost pressure control device 2 ... Acceleration increase control device 3 ... Current instruction output circuit 31 ... Data comparison circuit 32 ... Current instruction select circuit

Claims (1)

[Claims] 1. A TCG-equipped vehicle comprising a turbine driven by exhaust gas energy of an engine, a compressor for supercharging intake air into a cylinder by driving the turbine, and a rotating electric machine on a rotary shaft connecting the turbine and the compressor. In the acceleration control device, the vehicle speed detecting means for detecting the vehicle speed, the gear ratio detecting means for detecting the gear ratio of the transmission,
An engine speed detecting means for detecting an engine speed, a margin torque calculating means for calculating a margin torque of the vehicle based on detection signals from the three detecting means, and a target acceleration from a margin torque from the margin torque calculating means. It is characterized by further comprising: a target acceleration calculating means for obtaining and a current amount calculating means for calculating an amount of current supplied to the TCG rotating electric machine for satisfying the target acceleration calculated by the target acceleration calculating means and for instructing the inverter. An acceleration control device for a vehicle equipped with TCG.