JPS60155044A - Control circuit for driving mechanism of car - Google Patents

Abstract

PURPOSE:To improve fuel consumption and acceleration performance without the use of a speed change diagram by deciding the speed change time to control a driving mechanism according to signals from respective detectors for detecting running conditions of a car and previously memoried characteristic data of the car. CONSTITUTION:A diagram shows a driving system control circuit 4, which comprises a central processing unit (CPU) including a demand acceleration calculation circuit 41, a required horsepower calculation circuit 42, a differentiating circuit 43, a fuel consumption and throttle opening calculation circuit 44 and a speed change decision and throttle control circuit 45 and an engine/car data memory circuit ROM adapted to previously store engine output data such as a fuel consumption characteristic and an engine torque characteristic and characteristic data on a car such as the weight of a car. The speed change decision and throttle control circuit 45 is adapted to output a speed change command to a speed change control circuit 3 if the rate of fuel consumption is suitable for a new gear ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field] The present invention relates to an automobile drive system control device that realizes a shift that satisfies both fuel efficiency and acceleration performance without using a shift diagram.

[Prior Art] Conventionally, in electronically controlled automatic transmissions, in order to satisfy both fuel efficiency and acceleration performance, the transmission diagram has been changed depending on the rate of change of the throttle opening, or the transmission diagram has been selected by the driver using a manual switch. As a result, the number of types of shift diagrams has increased, the method of determining shift timing has become more complex, and the amount of data to be stored in advance has also increased.

[Object of the Invention] An object of the present invention is to combine signals from each detector that detects vehicle running conditions with vehicle characteristic data such as engine output (torque rotation speed, etc.) characteristic data and fuel consumption characteristic data stored in advance. Based on this, the automatic transmission is controlled by the drive system (engine control and gear shift control) by determining the timing of gear shifts, so it is possible to freely achieve improvements in fuel efficiency, acceleration, etc. without using a shift diagram. The present invention provides a drive system control device.

[Configuration of the Invention] The vehicle drive system control device of the present invention includes an accelerator pedal depression amount detector that increases or decreases the throttle opening, a detector for output shaft torque, vehicle speed, and other vehicle running conditions, and an engine throttle controller. a throttle actuator that increases or decreases the opening; an electronically controlled automatic transmission; an arithmetic circuit that calculates engine horsepower corresponding to the output signal of the accelerator pedal depression amount detector and the output signal of the vehicle running state detector; A storage circuit that stores vehicle characteristic data such as engine output characteristic data and fuel consumption characteristic data stored in advance, and a control for shifting gears with low fuel consumption based on the output signal of the arithmetic circuit and the data of the storage circuit, and It is composed of a control circuit that controls the thrower I/L actuator, and a shift control circuit that inputs a control signal from the control circuit and sends a shift control signal to the electronically controlled automatic transmission.

[Effects of the Invention] With the above configuration, the vehicle drive system control device of the present invention has the following effects:
It has the following effects.

b) Based on the detector signal, engine output characteristic data, and fuel consumption characteristic data, the shift timing is determined and the drive system of the automatic transmission is controlled, and a shift diagram is not used, so the method for determining the shift timing is simple. , the amount of data to be stored in advance can be reduced.

口) You can freely achieve a shift that satisfies both fuel efficiency and acceleration without using a shift diagram.

[Embodiment] An automobile drive system control device of the present invention will be explained based on an embodiment shown in the drawings.

As shown in FIG. 1, the vehicle drive system control device 1 of the present invention includes an accelerator pedal depression amount detector 11 that detects the depression amount (α) of an accelerator pedal 21, and another vehicle running state detector. An output shaft I torque detector 12 detects the torque (TO) of the output shaft of an electronically controlled automatic transmission for automobiles (hereinafter referred to as automatic transmission) 2, and an output shaft rotational speed (vehicle speed:
vehicle speed detector 13 that detects
2. Input interface 4A that inputs the detection signal from I3, output that outputs the speed change gear ratio (λ) to the speed change control circuit 3 that controls the speed change actuator 31, and outputs the throttle opening degree (θ) of the throttle valve actuator 22. Drive system control circuit 4 with interface 4B
It consists of

As shown in FIG. 2, the drive system control circuit 4 is a central circuit consisting of a required acceleration calculation circuit 41, a required horsepower calculation circuit 42, a differentiation circuit 43, a fuel consumption and throttle opening calculation circuit 44, and a shift judgment and throttle control circuit 45. Arithmetic processing unit CPU
and an engine/vehicle data storage circuit ROM in which engine output data such as fuel consumption characteristics, engine torque characteristics, and automobile characteristic data such as vehicle weight are stored in advance.

The required acceleration calculation circuit 41 calculates the required acceleration (lQoc) requested by the driver based on the accelerator pedal depression amount (α) from the accelerator pedal depression amount detector 11.

Calculate M).

The required horsepower calculation circuit 42 receives the required acceleration (Mocom) signal from the required acceleration calculation circuit 4, the output shaft torque (TO) signal from the output shaft torque detector 12, and the vehicle speed detector 1.
The required horsepower (PWreq) is calculated from the vehicle speed (NO) signal from 3 and the output shaft rotational acceleration signal obtained by differentiating the vehicle speed (No) with respect to time by the differentiating circuit 43 using the following formula.

Required horsepower PWreq = (To+jo(Nocorg-1't
o) ) N.

Here, JO: Vehicle moment of inertia.

The fuel consumption and throttle opening calculation circuit 44 inputs the required horsepower (PWreq) signal and vehicle speed (No.) signal from the required horsepower calculation circuit 42, and further inputs engine torque characteristic data and fuel consumption characteristic data from the ROM, and calculates each engine. The required horsepower (PWreq) is determined using the output data.
) for each gear ratio (input j:i
= 1.2.3 (3-speed automatic transmission)), then calculate the fuel consumption rate (f input i) of each gear ratio, and calculate the fuel consumption rate of the gear ratio with the best fuel efficiency (input new). (f new)
Select. Furthermore, adjust the throttle opening (θ input new) which determines the engine condition y9.

The shift judgment and throttle control circuit 45 determines the fuel consumption rate (f input n) when shifting to a new gear ratio (λnew).
If the fuel consumption rate (f input new) is better, compare the fuel consumption rate (f input now) when the current gear ratio (input nov) is maintained without shifting. If the fuel consumption rate (f input new) is better, shift. The command is output to the speed change control circuit 3.

The operation of an automatic transmission with three forward speeds and one reverse speed incorporating the automobile drive system control device of the present invention will be explained with reference to FIGS. 3 to 8.

Figure 8 shows the accelerator pedal depression amount (α), output shaft torque (TO), and vehicle speed (No.
), to detect the driving state of the vehicle such as throttle opening (θ) +01), and to detect the acceleration (and) in the drive system control circuit 4.
Calculation (102), Calculation of required acceleration (t4ocox) (+03), Calculation of required horsepower (104), Total 1 of fuel consumption rate and throttle opening (+05), Shift judgment and throttle opening determination (TOE) and output the gear ratio (input) to the shift control circuit 3. ),
To drive the throttle valve actuator 22 108
), and then issues the following sampling commands for the amount of accelerator depression, output shaft torque, and vehicle speed (109).

FIG. 4 is a calculation flowchart 1 for fuel consumption rate and throttle opening.

(+04), the vehicle inertia moment (Jo
), read each gear gear compartment 1 (i=1.2.3) (
201), based on the following formula, Tε enter i = 徲 y 21 life Hi = 1, 2, 3 people i N.

The engine torque required for each gear ratio is 202)
, reads the engine fuel consumption characteristics using the data shown in FIG. 8 (203), calculates the fuel consumption rate of each engine state for each gear ratio using the calculation results of (202) (204),
Read the engine I/lux characteristics from the data in Figure 7 (2
05), J-Reporter Calculate the throttle opening in the engine state (20B), and from the calculation results of (204) and (20f(), calculate the minimum fuel efficiency, the gear position at that time, and the throttle opening at that time. Select the speed (20?), then read the current gear (input now) (20fl), (20?).
From the calculation results of 4) and (20B), the fuel efficiency rate of the engine state at the current gear position (f input now) and the throttle opening (θ input n.

Select v) and proceed to (+05).

FIG. 5 is a flowchart for determining speed change and throttle opening. (al, a2 is a constant) (+05) and the new fuel efficiency rate (f input new) is the current fuel efficiency rate (fλno
v) to judge whether it is larger than 301), (f input no.
w ), proceed to (302), and (fλnov
) Outputs a signal so as not to shift when the value is larger than 30
3). (302) and (303) then determine the throttle opening corresponding to the gear ratio input.304) and (1
06).

Figure 6 shows the required horsepower (PWreq) in a diagram showing fuel consumption characteristics.
) The current gear (on n0W) is the 3rd gear.
speed (on 3), indicating that shifting to the new 2nd gear (on new) is better in terms of fuel efficiency than not changing gears.

FIG. 7 shows a method of adjusting the throttle opening for each gear ratio.

FIG. 8 shows that the required horsepower (PWreq) is achieved even if the gear is shifted to a new gear (new).

The method is not limited to this embodiment, and the following method may be used.

b) The input/output relationship of the required acceleration calculation circuit may be arbitrarily set by the designer so as to provide a comfortable ride for the driver.

Ex) Acceleration may be detected directly by some kind of detector (for example, an acceleration detector) instead of by differential calculation of vehicle speed.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of a drive system control device for an automobile according to the present invention, FIG. 2 is a block diagram of a drive system control circuit of a drive system control device for an automobile according to the present invention, and FIG. Flowchart 1 of the entire system of the system control device, diagram 4
FIG. 5 is a flowchart for calculating the fuel consumption rate and throttle opening of the vehicle drive system control device according to the present invention; FIG. Fig. 7 is a conceptual diagram of the adjustment force for the optimum fuel gear ratio applied to the drive system control device for an automobile according to the present invention; The figure is a diagram showing the relationship between the required horsepower and speed change in the drive system control device for an automobile according to the present invention. In the diagram: 1. Automotive drive system control device 2. Automotive electronically controlled automatic transmission 3. Shift control circuit 4. Drive system control circuit 11. Accelerator pedal depression amount detector
12...Output shaft torque detector 1 13...Vehicle speed detector 41...Required acceleration calculation circuit 42
... Required horsepower calculation circuit 43 ... Differentiation circuit 44 ... Fuel consumption and throttle opening 31 calculation circuit 45 ... Shift judgment and throttle control circuit CPU ... Central processing circuit R
OM...Engine/vehicle data storage circuit agent Kenji Ishiguro 2 Figure 2 Figure 3

Claims (1)

[Claims] l) An accelerator pedal depression amount detector that increases/decreases the throttle opening, a detector for output shaft torque, vehicle speed, and other vehicle running conditions, a throttle actuator that increases/decreases the engine throttle opening, and an electronically controlled automatic gear shift. machine and
an arithmetic circuit that calculates engine horsepower corresponding to the output signal of the accelerator pedal depression amount detector and the output signal of the vehicle running state detector; and vehicle characteristics such as engine output characteristic data and fuel consumption characteristic data stored in advance; a memory circuit that stores data; a control circuit that controls gear shifting to reduce fuel consumption based on the output signal of the arithmetic circuit and data of the memory circuit; and a control circuit that controls the throttle actuator; and a control circuit that controls the throttle actuator. A drive system control device for an automobile comprising a shift control circuit that inputs a υ1 signal and sends a shift control signal to the electronically controlled automatic transmission.