JPH04321439A - Control device for degree of throttle opening and gear shifting position - Google Patents

Abstract

PURPOSE:To enhance the accelerating feeling and the rate of fuel consumption by calculating the target acceleration value from the degree of accel. opening and the sensed car speed, setting the gearing position which gives the target acceleration with optimum rate of fuel consumption on the basis of data stored in advance, and setting the degree of throttle opening corresponding to the set gearing position. CONSTITUTION:A car speed sensing means 52 senses the car speed from the output of an automatic transmission 51, and the result is fed to a target acceleration calculating means 57. Also from this car speed an acceleration sensing means 53 determines the acceleration, and the result is fed to a throttle opening calculating means 61. Meantime the accel. opening signal given by an accel. opening sensing means 55 and the accel. open speed given by an accel. open speed calculating means 56 are fed to the target acceleration calculating means 57 to serve calculating of the target acceleration. On the basis of target acceleration thus obtained, a gear shift calculating means 58 determines the gearing position, and on the basis thereof the throttle opening calculating means 61 determines the throttle opening, which serves controlling a throttle driving means 62.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle opening and gear position control system for an automobile that can maintain good fuel efficiency under any driving conditions.

0002

2. Description of the Related Art Generally, automatic transmissions are known that automatically increase and change gears depending on the speed of the vehicle and the amount of depression of the accelerator pedal.

[0003] This type of automatic transmission uses a memory map of vehicle speed or engine rotational speed and throttle opening.
It determines the gear position of the vehicle and maintains a predetermined vehicle speed.

0004

[Problem to be solved by the invention] Current automatic transmissions are
The gears are changed based on a map of vehicle speed or engine speed and throttle opening, and are unrelated to optimal fuel efficiency. Furthermore, even when the same acceleration was obtained, the amount of depression of the accelerator pedal changed at the shift point, resulting in poor accelerator feeling.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a throttle opening and gear position control device that improves accelerator feeling and fuel efficiency.

[0006]

[Means for Solving the Problems] A throttle opening and gear position control device according to the present invention includes a target acceleration setting means for calculating a target acceleration from an accelerator opening degree and a vehicle speed detection output, and an engine rotation speed and a gear position for each gear position. a gear position setting means for setting a gear position corresponding to the best fuel efficiency for obtaining the target acceleration calculated by the target acceleration calculating means using a storage means storing a throttle opening degree and fuel efficiency with respect to engine torque; A throttle opening degree corresponding to the gear position set by the setting means is determined.

[0007]

[Operation] In this invention, the target acceleration is calculated from the accelerator opening degree and the vehicle speed detection output by the target acceleration calculation means,
A gear position corresponding to the best fuel efficiency for obtaining the target acceleration calculated by the target acceleration calculation means in the gear setting means, using the fuel efficiency with respect to the engine rotation speed and the engine torque for each gear position stored in advance in the storage means. and set
A throttle opening degree setting means determines a throttle opening degree corresponding to the gear position.

[0008]

[Embodiments] Hereinafter, embodiments of the present invention will be explained with reference to the drawings.

FIG. 1 is an overall control circuit diagram of a throttle opening degree and gear position control device according to an embodiment of the present invention.

In FIG. 1, a control circuit 1 that receives detection signals from various sensors and outputs control signals to various devices is composed of a microcomputer, and includes target acceleration calculation means, storage means, and storage means, which will be described later in this embodiment. gear setting means,
The throttle opening setting means is provided. The control circuit 1 is connected to a power source VB via an ignition switch 5. The control circuit 1 is connected to a coil 3 of an electromagnetic clutch mechanism 2 that adjusts the throttle opening and a motor 4. Further, an accelerator sensor 6 is connected to the control circuit 1 and outputs a signal corresponding to the amount of depression of the accelerator pedal 7, which is input together with the output signal of the throttle sensor 8. That is, in the control circuit 1, the electromagnetic clutch mechanism 2 is turned on and off depending on the operating conditions.
The motor 4 is controlled so that the opening degree of the throttle valve 9 is set according to the operating condition of the internal combustion engine and the driving condition of the vehicle depending on the amount of depression of the accelerator pedal 7.
drive control is performed.

Further, a constant speed running control switch 10 (hereinafter simply referred to as a "constant speed running switch") is connected to the control circuit 1. The constant speed running switch 10 consists of a main switch 11 that turns on and off the power of the entire constant speed running control system, and a control switch 12 that performs various controls. It has the following various switch functions.

While the vehicle is running, turn on the main switch 11 and press the set switch ST in the control switch 12.
When turned on for a short period of time, the vehicle speed at that time is stored and maintained. accelerate switch ac
is used to finely adjust the set vehicle speed, and speed increase control is performed while it is in the on state. On the other hand, fine adjustment on the deceleration side can be made by keeping the set switch ST in the on state, or by turning it off once.
After depressing the brake pedal to release the constant speed running control, the vehicle speed is reset by turning on the set switch ST for a short time when the vehicle speed has been decelerated to a predetermined value. Cancel switch CA is a switch for canceling constant speed driving control. The resume switch RS is a switch for returning the vehicle speed to the preset vehicle speed before the constant speed driving control was canceled by these operations.

The wheel speed sensor 13 is used for constant speed running control, acceleration slip control, etc., and a known electromagnetic pickup sensor or wheel sensor is used. Further, an ignition circuit unit, that is, an igniter 14 is connected to the control circuit 1, and an ignition signal is input thereto to detect the engine rotation speed.

A transmission controller 15 connected to the control circuit 1 is an electronic control circuit that controls the automatic transmission 16, and inputs signals from the wheel speed sensor 13, throttle sensor 8, etc., and monitors the operating state of the engine and the vehicle. Detects the running condition, calculates the gear shift position, etc. based on this, outputs a gear shift signal and timing signal, drives a solenoid valve based on the gear shift signal, and controls hydraulic pressure to the brake or clutch built in the automatic transmission 16. and performs a speed change operation.

The automatic transmission 16 has a parking range (hereinafter simply referred to as "P range") by operating the shift lever 17.
), reverse range (hereinafter simply referred to as "R range")
), neutral range (hereinafter simply referred to as ``N range''), drive range (hereinafter simply referred to as ``D range''), second range (hereinafter simply referred to as ``2 range''), and low range (hereinafter simply referred to as ``2 range''). , ``L range'') is selected. The shift switch is attached to this automatic transmission 16 and is used to control the positions of the shift lever 17, that is, the above-mentioned P, R, N, D, 2, and L.
This switch detects which shift position of the range the shift position is in, and output signals indicating the shift position are supplied to the transmission controller 15 and also to the control circuit 1.

The mode selector switch 18 stores a map in the memory of the control circuit 1 in advance, which sets various operation modes regarding the correspondence between the amount of depression of the accelerator pedal 7 and the opening degree of the throttle valve 9. This is selected as appropriate to set the target throttle opening degree of the throttle valve 11 according to the operation mode. As this driving mode, for example, a mode such as power or economy, highway driving or city driving can be set. The acceleration slip control prohibition switch 19 is
If the driver does not like the acceleration slip control, by operating this, a signal is output to the control circuit 1 to prohibit the same control. For example, when performing acceleration step control, the steering sensor 20 determines whether or not the steering wheel is turning, and sets a target slip ratio in accordance with the determination result. Brake switch 2
Reference numeral 1 denotes a switch that opens and closes in response to the operation of a brake pedal (not shown). By operating this switch, a brake lamp 22 lights up, and a normally closed switch 23 is linked to open and open, and is connected to the electromagnetic clutch mechanism 2. The energizing circuit 24 for constant speed running control is opened.

[0017] Then, the engine output shaft torque sensor 29
is a well-known torque sensor provided on the output shaft of the engine, and is used when calculating the driving force of the vehicle or changing the gear position. Further, a vacuum switch 42 for detecting a load state is connected to the input side of the control circuit 1, and an oil control valve 43 for the cylinder arranged in the cylinder of the engine 41 and switched to a normal operating state or a stopped state is connected to the input side of the control circuit 1. connected to the output side of the

The starter circuit 30 drives and controls the starter motor 31, and has a second relay connected in series to the coil of a first relay 32 that opens and closes the drive circuit of the starter motor 31.
A relay 33 is provided, and this second relay 33 is controlled. These first relays 3
2 and the starter switch 34 in series with the second relay 33
is connected, and in the vehicle equipped with the automatic converter 16, a neutral start switch 35 is inserted between these connections. This is turned on when the automatic transmission 16 is in the neutral position, that is, in the N range, and when the start switch 34 is turned on in this state, the second relay 3
3 is on, the coil of the first relay 32 is energized, the drive circuit for the starter motor 31 is turned on, and the starter motor 31 is driven.

The operation of the throttle opening and gear position control device of this embodiment having the above configuration will be explained.

FIGS. 2 and 3 are flowcharts showing the control of the main program executed by the control circuit 1 of the throttle opening degree and gear position control device according to an embodiment of the present invention.

First, initialize in step S1,
In step S2, input and output signals are initialized, and in step S3, one of the control routines from step S4 to step S8 is selected depending on the input signal.

[0022] When the control in steps S4 to S6 is performed, torque control is performed in step S9, and step S
At 10, cornering control of throttle control is performed in accordance with the rolling angle of the steering wheel (not shown). Note that the idle rotation speed control in step S7 is to control the idle rotation speed to maintain a constant value;
Final processing 8 is a post-processing after turning off the ignition switch 5, but since it is not directly related to the gist of the present invention, its explanation will be omitted. Furthermore, in the fail processing and diagnosis control in step S11, after self-diagnosis is performed and final processing is performed, the motor 4 of the electromagnetic clutch mechanism 2 that outputs the target throttle opening and the gear position are controlled in the output processing in step S12. In order to change the gear position, a predetermined gear position is output, and thereafter this routine is repeated at a predetermined cycle.

Next, the operation of the normal accelerator control in step S4 will be explained.

First, in step S21, a target acceleration 1 is calculated from the vehicle speed and the accelerator opening. For this operation, Figure 5
As shown in the memory map for target acceleration 1 of this embodiment, the value calculated by calculating how much acceleration can be obtained at a specific vehicle speed is stored in the memory map, and the target acceleration 1 is calculated from the vehicle speed and accelerator opening. Select. In step S22, the target acceleration 2 is calculated from the accelerator opening speed obtained from the vehicle speed and the rate of change of the accelerator opening. For this calculation, as shown in the memory map of the target acceleration 2 of this embodiment in FIG.
Target acceleration 2 is selected from the vehicle speed and accelerator opening speed. In step S23, target acceleration 2 is added to target acceleration 1 to calculate a target acceleration that is the required acceleration.

In step S24, in order to determine which gear should be set in the current driving state, first, "1" is set in the gear memory as the initial value of the gear, and in step S25, the fuel efficiency is determined. The current fuel consumption is stored in the optimum fuel efficiency memory as an initial value. In step S26, fuel efficiency is calculated from the engine speed and engine torque for each gear stage using the memory map for fuel efficiency selection of this embodiment shown in FIG. 7, and the fuel efficiency is stored in the fuel efficiency memory. In step S27, the fuel efficiency stored in the optimal fuel efficiency memory in step S25 is compared with the value in the fuel efficiency memory calculated in step S26, and if the value in the optimal fuel efficiency memory is greater than the value in the fuel efficiency memory, the gear position is not at the optimal value. In step S30, the value of the gear position memory is increased by "1", and in step S31, it is determined whether the value of the gear position memory exceeds all the gear positions installed in the vehicle. From then on, the routine of step S31 is repeatedly executed.

[0026] In step S27, the fuel efficiency stored in the optimum fuel efficiency memory is compared with the value in the fuel efficiency memory, and if the value in the optimum fuel efficiency memory is less than the value in the fuel efficiency memory, the gear position is a better value than the current gear position. Then, in step S28, the value in the optimum fuel efficiency memory is rewritten to the fuel efficiency value in the fuel efficiency memory, and in step S29, the value in the gear position memory at that time is set in the gear setting memory.

That is, from step S26 to step S31
In the routine, in order to find a better fuel efficiency than the current fuel efficiency stored in the optimum fuel efficiency memory as the initial value of fuel efficiency in step S25, the engine gears are sequentially increased, and when a gear gear with good fuel efficiency is found, The gear position and fuel consumption are stored in the gear setting memory and the optimum fuel efficiency memory, and are outputted in step S12 described above.

Then, in step S32, the target acceleration is multiplied by the vehicle weight to obtain the target engine torque, and the throttle opening is determined from the gear position value stored in the gear position setting memory and the corresponding target engine torque and engine rotation speed. Calculate. For this calculation, the throttle opening degree is selected from the engine speed and engine torque of the present embodiment shown in FIG. Further, in step S33, the actual acceleration that actually occurs is subtracted from the target acceleration, and the result is multiplied by a constant to calculate the throttle opening difference when performing feedback control. Then, in step S34, the sum of the difference between the throttle opening and the throttle opening when feedback control is performed is set as the output of the target throttle opening control, and this routine is exited.

Next, the operation of constant speed running control in step S5 will be briefly explained.

As shown in FIG. 1, when the set switch ST of the control switch 12 is operated after the normally open switch 11a of the main switch 11 is operated, the relay 11c is energized via the normally closed switch 11b. In this case, when the throttle valve 9 has a predetermined opening degree or more,
When the accelerator pedal 7 is not operated, the first energizing circuit 25 is opened. However, since the coil 3 continues to be energized via the second energizing circuit 24 during constant speed driving control,
The throttle shaft is connected to a motor 4 via an electromagnetic clutch mechanism 2. Thus, a predetermined target throttle opening is set according to the difference between the vehicle speed detected by the wheel speed sensor 13 and the vehicle speed set by the set switch ST, and the motor 4 causes the throttle valve 9 to adjust to this target throttle opening. Drive controlled.

[0031] When driving at a constant speed, it becomes necessary to accelerate to overtake, etc.
When the accelerator pedal 7 is depressed and the target throttle opening corresponding to the operation amount of the accelerator pedal 7 in the normal accelerator control routine exceeds the target throttle opening when constant speed driving control is set, this target throttle opening corresponds to the normal accelerator The control routine will be executed.

On the other hand, when canceling constant speed driving control,
When the driver operates the cancel switch CA of the control switch 12 or turns off the main switch 11, the first energizing circuit 24 is opened. The same applies even if the ignition switch 5 is turned off. Also, when a brake pedal (not shown) is operated, the normally closed switch 23, which is linked to the brake switch 21, is turned off.
The first energizing circuit 24 becomes open. Thereafter, through the second energization circuit 25, the throttle control during normal accelerator control described above is entered.

Next, the operation of the acceleration slip control in step S6 will be briefly explained.

[0034] When slip of the driving wheels during start or acceleration is detected from the output signal of the wheel speed sensor 13, an acceleration slip control routine is selected and the target throttle opening of the throttle valve 9 is controlled. That is, the control circuit 1 calculates the slip ratio of the driving wheels that provides sufficient traction and lateral stress on the road surface, and further calculates the target throttle opening degree to ensure this. And throttle valve 9
The motor 4 is controlled so that the target throttle opening is reached. When the slip rate becomes less than a predetermined value and the target throttle opening becomes more than the throttle opening set during normal accelerator control, the acceleration slip control routine ends,
Return to normal accelerator control routine. During this time as well, the opening degree of the throttle valve 9 is controlled by the motor 4, so that so-called pedal shock does not occur in the accelerator pedal 7 even when switching between the acceleration slip control routine and the normal accelerator control routine.

[0035] Throttle sensor 8 and accelerator sensor 6
When it is detected that the target throttle opening of the throttle valve 9 and the operation amount of the accelerator pedal 7 are below a predetermined value, the idle rotation speed control routine of step S7 is executed, and the operating state of the internal combustion engine such as the cooling water temperature and load at that time is changed. The motor 4 is drive-controlled so as to reach the target engine rotation speed set according to the target engine speed.

The functions of the throttle opening degree and gear position control device of the above embodiment will be explained as follows.

FIG. 9 is a functional explanatory diagram of a throttle opening degree and gear position control device according to an embodiment of the present invention.

In FIG. 9, an output shaft of an engine 50 is outputted via an automatic transmission 51. As shown in FIG. A vehicle speed detection means 52 detects the vehicle speed from the output of the automatic transmission 51, and is further connected to an acceleration detection means 53 that calculates acceleration based on the differentiation of the vehicle speed, from which the acceleration is detected.

Accelerator operation means 54 such as an accelerator pedal
The output of
The output of the accelerator opening detection means 55 is led to the accelerator opening speed calculation means 56, where the change in the accelerator opening is determined as the accelerator opening speed, and the output of the accelerator opening detection means 55 and the accelerator opening speed are calculated. The output of the calculation means 56 is guided to the target acceleration calculation means 57. The target acceleration calculation means 57 inputs the vehicle speed from the vehicle speed detection means 52, and
Target acceleration 1 and target acceleration 2 in FIGS. 5 and 6 are obtained. This function corresponds to steps S21 to S23. Further, the gear position calculation means 58 inputs the target acceleration 1 and the target acceleration 2 from the target acceleration calculation means 57, and detects the rotation speed of the engine 50 from the ignition circuit unit. A signal is inputted to an engine rotation speed detecting means 60 which detects the engine rotation speed from the input signal, and sequentially increases the gear position of the engine, and when the gear position has good fuel efficiency, the gear position and fuel efficiency are detected. These values are stored in a gear setting memory and an optimum fuel efficiency memory, and a fuel efficiency that is better than the current fuel efficiency stored in the optimum fuel efficiency memory is found as an initial value of fuel efficiency. The gear position set in the gear position setting memory is output to a gear change control means 59 that controls the automatic transmission 51, and selects a predetermined gear position. This function is performed from step S26 to step S31.
corresponds to

The outputs of the target acceleration calculation means 57 and the gear stage calculation means 58 are calculated by the throttle opening calculation means 61, and drive control of the throttle drive means 62 is performed. This function corresponds to steps S32 to S34.

As described above, the throttle opening degree and gear position control device of this embodiment calculates the target acceleration from the accelerator opening degree and the vehicle speed detection output from step S21 to step S.
23, a storage means comprising a memory map storing characteristics as shown in FIG. 7, which stores the throttle opening degree and fuel consumption for each gear speed and engine torque, and the storage means a gear position setting means comprising steps S26 to S31 for selecting a gear position corresponding to the best fuel consumption to obtain the target acceleration calculated by the target acceleration calculating means; The throttle opening setting means includes steps S32 to S34 for determining the throttle opening.

Therefore, the driver's target acceleration, that is, the requested acceleration, is determined from the accelerator opening degree, and the gears are sequentially increased in a driving state with better fuel efficiency than the current fuel efficiency stored in the optimum fuel efficiency memory as the initial value of fuel efficiency. search for good fuel efficiency and the gear position at that time, and when a good fuel economy and gear position are found, store those values in the gear setting memory and the optimum fuel efficiency memory, and calculate the fuel efficiency. The vehicle can be operated in good gears.

Further, the required acceleration selects the optimum gear stage and throttle opening based on the engine speed. Therefore, since the optimum gear stage and throttle opening are selected and controlled based on the driver's requested acceleration, they are associated with a predetermined requested acceleration, and the accelerator feeling does not change depending on the driving conditions, resulting in a change in accelerator feel. The ring gets better.

[0044] Then, the throttle opening setting means for determining the throttle opening corresponding to the gear position is configured to obtain the control amount from a memory map in which the throttle opening degree is associated with the engine speed and engine torque for each operating gear position. Since the control amount is selected, the control amount can be obtained more quickly than when the predetermined throttle opening degree is obtained by calculation.

[0045]

As described above, the throttle opening and gear position control device of the present invention includes a target acceleration calculating means for calculating a target acceleration from the accelerator opening degree and the vehicle speed detection output, and a target acceleration calculation means for calculating the target acceleration from the accelerator opening degree and the vehicle speed detection output, and the engine speed and gear position control device for each gear position. gear setting means for selecting a gear position corresponding to the best fuel efficiency for obtaining the target acceleration calculated by the target acceleration calculation means using a storage means storing throttle opening degree and fuel efficiency with respect to engine torque; The throttle opening degree corresponding to the gear position selected by the setting means is determined.

Therefore, the driver's requested acceleration is determined from the accelerator opening degree, and the engine gears are sequentially increased to detect the existence of better fuel efficiency than the current fuel efficiency stored in the optimum fuel efficiency memory as the initial value of fuel efficiency. When the fuel efficiency and gear position are found, the gear position and fuel efficiency are stored in the gear setting memory and the optimum fuel efficiency memory, and the vehicle can be operated at a gear position with good fuel efficiency. In addition, since the optimal gear and throttle opening are selected and controlled based on the driver's requested acceleration, the accelerator feeling does not change depending on the driving conditions because it corresponds to the predetermined requested acceleration. Ring can provide a good vehicle.

[Brief explanation of drawings]

FIG. 1 is an overall control circuit diagram of a throttle opening degree and gear position control device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing control of a main program executed by a control circuit of a throttle opening degree and gear position control device according to an embodiment of the present invention.

FIG. 3 is a main part of a flowchart of a normal accelerator control routine used in the throttle opening degree and gear position control device according to an embodiment of the present invention.

FIG. 4 is a part of a flowchart of a normal accelerator control routine used in a throttle opening degree and gear position control device according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram of a memory map of target acceleration 1 used in a throttle opening degree and gear position control device according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram of a memory map of target acceleration 2 used in the throttle opening degree and gear position control device according to an embodiment of the present invention.

FIG. 7 is an explanatory diagram of a memory map for calculating the gear position for optimum fuel efficiency used in the throttle opening degree and gear position control device according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram of a memory map of the throttle opening degree used in the throttle opening degree and gear position control device according to an embodiment of the present invention.

FIG. 9 is a functional explanatory diagram of a throttle and gear position control circuit of a throttle opening degree and gear position control device according to an embodiment of the present invention.

[Explanation of symbols]

1 Control circuit 43 Oil control valve 50
Engine 51 Automatic transmission 52 Vehicle speed detection means 56 Accelerator opening detection means 59
Gear change control means

Claims (1)

[Claims] 1. A target acceleration calculation means for calculating a target acceleration from an accelerator opening and a vehicle speed detection output, a storage means for storing a throttle opening and fuel consumption with respect to an engine rotational speed and engine torque for each gear stage, and the storage means. a gear position setting means for setting a gear position corresponding to the best fuel consumption to obtain the target acceleration calculated by the target acceleration calculating means using the above-mentioned gear position setting means; 1. A throttle opening and gear position control device, comprising a throttle opening setting means for setting the throttle opening using a throttle opening setting means.